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Initial KVM RISC-V support 

Following features are supported by the initial KVM RISC-V support:
 1. No RISC-V specific KVM IOCTL
 2. Loadable KVM RISC-V module
 3. Minimal possible KVM world-switch which touches only GPRs and few CSRs
 4. Works on both RV64 and RV32 host
 5. Full Guest/VM switch via vcpu_get/vcpu_put infrastructure
 6. KVM ONE_REG interface for VCPU register access from KVM user-space
 7. Interrupt controller emulation in KVM user-space
 8. Timer and IPI emuation in kernel
 9. Both Sv39x4 and Sv48x4 supported for RV64 host
 10. MMU notifiers supported
 11. Generic dirty log supported
 12. FP lazy save/restore supported
 13. SBI v0.1 emulation for Guest/VM
 14. Forward unhandled SBI calls to KVM user-space
 15. Hugepage support for Guest/VM
 16. IOEVENTFD support for Vhost
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Merge tag 'kvm-riscv-5.16-1' of git://github.com/kvm-riscv/linux into HEAD

Initial KVM RISC-V support

Following features are supported by the initial KVM RISC-V support:
1. No RISC-V specific KVM IOCTL
2. Loadable KVM RISC-V module
3. Minimal possible KVM world-switch which touches only GPRs and few CSRs
4. Works on both RV64 and RV32 host
5. Full Guest/VM switch via vcpu_get/vcpu_put infrastructure
6. KVM ONE_REG interface for VCPU register access from KVM user-space
7. Interrupt controller emulation in KVM user-space
8. Timer and IPI emuation in kernel
9. Both Sv39x4 and Sv48x4 supported for RV64 host
10. MMU notifiers supported
11. Generic dirty log supported
12. FP lazy save/restore supported
13. SBI v0.1 emulation for Guest/VM
14. Forward unhandled SBI calls to KVM user-space
15. Hugepage support for Guest/VM
16. IOEVENTFD support for Vhost
This commit is contained in:
Paolo Bonzini 2021-10-05 04:19:24 -04:00
Родитель deae4a10f1 24b699d12c
Коммит 542a2640a2
27 изменённых файлов: 4714 добавлений и 10 удалений
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193
Documentation/virt/kvm/api.rst
Просмотреть файл

@ -532,7 +532,7 @@ translation mode.
------------------
:Capability: basic
:Architectures: x86, ppc, mips
:Architectures: x86, ppc, mips, riscv
:Type: vcpu ioctl
:Parameters: struct kvm_interrupt (in)
:Returns: 0 on success, negative on failure.
@ -601,6 +601,23 @@ interrupt number dequeues the interrupt.
This is an asynchronous vcpu ioctl and can be invoked from any thread.
RISC-V:
^^^^^^^
Queues an external interrupt to be injected into the virutal CPU. This ioctl
is overloaded with 2 different irq values:
a) KVM_INTERRUPT_SET
This sets external interrupt for a virtual CPU and it will receive
once it is ready.
b) KVM_INTERRUPT_UNSET
This clears pending external interrupt for a virtual CPU.
This is an asynchronous vcpu ioctl and can be invoked from any thread.
4.17 KVM_DEBUG_GUEST
--------------------
@ -1399,7 +1416,7 @@ for vm-wide capabilities.
---------------------
:Capability: KVM_CAP_MP_STATE
:Architectures: x86, s390, arm, arm64
:Architectures: x86, s390, arm, arm64, riscv
:Type: vcpu ioctl
:Parameters: struct kvm_mp_state (out)
:Returns: 0 on success; -1 on error
@ -1416,7 +1433,8 @@ uniprocessor guests).
Possible values are:
========================== ===============================================
KVM_MP_STATE_RUNNABLE the vcpu is currently running [x86,arm/arm64]
KVM_MP_STATE_RUNNABLE the vcpu is currently running
[x86,arm/arm64,riscv]
KVM_MP_STATE_UNINITIALIZED the vcpu is an application processor (AP)
which has not yet received an INIT signal [x86]
KVM_MP_STATE_INIT_RECEIVED the vcpu has received an INIT signal, and is
@ -1425,7 +1443,7 @@ Possible values are:
is waiting for an interrupt [x86]
KVM_MP_STATE_SIPI_RECEIVED the vcpu has just received a SIPI (vector
accessible via KVM_GET_VCPU_EVENTS) [x86]
KVM_MP_STATE_STOPPED the vcpu is stopped [s390,arm/arm64]
KVM_MP_STATE_STOPPED the vcpu is stopped [s390,arm/arm64,riscv]
KVM_MP_STATE_CHECK_STOP the vcpu is in a special error state [s390]
KVM_MP_STATE_OPERATING the vcpu is operating (running or halted)
[s390]
@ -1437,8 +1455,8 @@ On x86, this ioctl is only useful after KVM_CREATE_IRQCHIP. Without an
in-kernel irqchip, the multiprocessing state must be maintained by userspace on
these architectures.
For arm/arm64:
^^^^^^^^^^^^^^
For arm/arm64/riscv:
^^^^^^^^^^^^^^^^^^^^
The only states that are valid are KVM_MP_STATE_STOPPED and
KVM_MP_STATE_RUNNABLE which reflect if the vcpu is paused or not.
@ -1447,7 +1465,7 @@ KVM_MP_STATE_RUNNABLE which reflect if the vcpu is paused or not.
---------------------
:Capability: KVM_CAP_MP_STATE
:Architectures: x86, s390, arm, arm64
:Architectures: x86, s390, arm, arm64, riscv
:Type: vcpu ioctl
:Parameters: struct kvm_mp_state (in)
:Returns: 0 on success; -1 on error
@ -1459,8 +1477,8 @@ On x86, this ioctl is only useful after KVM_CREATE_IRQCHIP. Without an
in-kernel irqchip, the multiprocessing state must be maintained by userspace on
these architectures.
For arm/arm64:
^^^^^^^^^^^^^^
For arm/arm64/riscv:
^^^^^^^^^^^^^^^^^^^^
The only states that are valid are KVM_MP_STATE_STOPPED and
KVM_MP_STATE_RUNNABLE which reflect if the vcpu should be paused or not.
@ -2577,6 +2595,144 @@ following id bit patterns::
0x7020 0000 0003 02 <0:3> <reg:5>
RISC-V registers are mapped using the lower 32 bits. The upper 8 bits of
that is the register group type.
RISC-V config registers are meant for configuring a Guest VCPU and it has
the following id bit patterns::
0x8020 0000 01 <index into the kvm_riscv_config struct:24> (32bit Host)
0x8030 0000 01 <index into the kvm_riscv_config struct:24> (64bit Host)
Following are the RISC-V config registers:
======================= ========= =============================================
Encoding Register Description
======================= ========= =============================================
0x80x0 0000 0100 0000 isa ISA feature bitmap of Guest VCPU
======================= ========= =============================================
The isa config register can be read anytime but can only be written before
a Guest VCPU runs. It will have ISA feature bits matching underlying host
set by default.
RISC-V core registers represent the general excution state of a Guest VCPU
and it has the following id bit patterns::
0x8020 0000 02 <index into the kvm_riscv_core struct:24> (32bit Host)
0x8030 0000 02 <index into the kvm_riscv_core struct:24> (64bit Host)
Following are the RISC-V core registers:
======================= ========= =============================================
Encoding Register Description
======================= ========= =============================================
0x80x0 0000 0200 0000 regs.pc Program counter
0x80x0 0000 0200 0001 regs.ra Return address
0x80x0 0000 0200 0002 regs.sp Stack pointer
0x80x0 0000 0200 0003 regs.gp Global pointer
0x80x0 0000 0200 0004 regs.tp Task pointer
0x80x0 0000 0200 0005 regs.t0 Caller saved register 0
0x80x0 0000 0200 0006 regs.t1 Caller saved register 1
0x80x0 0000 0200 0007 regs.t2 Caller saved register 2
0x80x0 0000 0200 0008 regs.s0 Callee saved register 0
0x80x0 0000 0200 0009 regs.s1 Callee saved register 1
0x80x0 0000 0200 000a regs.a0 Function argument (or return value) 0
0x80x0 0000 0200 000b regs.a1 Function argument (or return value) 1
0x80x0 0000 0200 000c regs.a2 Function argument 2
0x80x0 0000 0200 000d regs.a3 Function argument 3
0x80x0 0000 0200 000e regs.a4 Function argument 4
0x80x0 0000 0200 000f regs.a5 Function argument 5
0x80x0 0000 0200 0010 regs.a6 Function argument 6
0x80x0 0000 0200 0011 regs.a7 Function argument 7
0x80x0 0000 0200 0012 regs.s2 Callee saved register 2
0x80x0 0000 0200 0013 regs.s3 Callee saved register 3
0x80x0 0000 0200 0014 regs.s4 Callee saved register 4
0x80x0 0000 0200 0015 regs.s5 Callee saved register 5
0x80x0 0000 0200 0016 regs.s6 Callee saved register 6
0x80x0 0000 0200 0017 regs.s7 Callee saved register 7
0x80x0 0000 0200 0018 regs.s8 Callee saved register 8
0x80x0 0000 0200 0019 regs.s9 Callee saved register 9
0x80x0 0000 0200 001a regs.s10 Callee saved register 10
0x80x0 0000 0200 001b regs.s11 Callee saved register 11
0x80x0 0000 0200 001c regs.t3 Caller saved register 3
0x80x0 0000 0200 001d regs.t4 Caller saved register 4
0x80x0 0000 0200 001e regs.t5 Caller saved register 5
0x80x0 0000 0200 001f regs.t6 Caller saved register 6
0x80x0 0000 0200 0020 mode Privilege mode (1 = S-mode or 0 = U-mode)
======================= ========= =============================================
RISC-V csr registers represent the supervisor mode control/status registers
of a Guest VCPU and it has the following id bit patterns::
0x8020 0000 03 <index into the kvm_riscv_csr struct:24> (32bit Host)
0x8030 0000 03 <index into the kvm_riscv_csr struct:24> (64bit Host)
Following are the RISC-V csr registers:
======================= ========= =============================================
Encoding Register Description
======================= ========= =============================================
0x80x0 0000 0300 0000 sstatus Supervisor status
0x80x0 0000 0300 0001 sie Supervisor interrupt enable
0x80x0 0000 0300 0002 stvec Supervisor trap vector base
0x80x0 0000 0300 0003 sscratch Supervisor scratch register
0x80x0 0000 0300 0004 sepc Supervisor exception program counter
0x80x0 0000 0300 0005 scause Supervisor trap cause
0x80x0 0000 0300 0006 stval Supervisor bad address or instruction
0x80x0 0000 0300 0007 sip Supervisor interrupt pending
0x80x0 0000 0300 0008 satp Supervisor address translation and protection
======================= ========= =============================================
RISC-V timer registers represent the timer state of a Guest VCPU and it has
the following id bit patterns::
0x8030 0000 04 <index into the kvm_riscv_timer struct:24>
Following are the RISC-V timer registers:
======================= ========= =============================================
Encoding Register Description
======================= ========= =============================================
0x8030 0000 0400 0000 frequency Time base frequency (read-only)
0x8030 0000 0400 0001 time Time value visible to Guest
0x8030 0000 0400 0002 compare Time compare programmed by Guest
0x8030 0000 0400 0003 state Time compare state (1 = ON or 0 = OFF)
======================= ========= =============================================
RISC-V F-extension registers represent the single precision floating point
state of a Guest VCPU and it has the following id bit patterns::
0x8020 0000 05 <index into the __riscv_f_ext_state struct:24>
Following are the RISC-V F-extension registers:
======================= ========= =============================================
Encoding Register Description
======================= ========= =============================================
0x8020 0000 0500 0000 f[0] Floating point register 0
...
0x8020 0000 0500 001f f[31] Floating point register 31
0x8020 0000 0500 0020 fcsr Floating point control and status register
======================= ========= =============================================
RISC-V D-extension registers represent the double precision floating point
state of a Guest VCPU and it has the following id bit patterns::
0x8020 0000 06 <index into the __riscv_d_ext_state struct:24> (fcsr)
0x8030 0000 06 <index into the __riscv_d_ext_state struct:24> (non-fcsr)
Following are the RISC-V D-extension registers:
======================= ========= =============================================
Encoding Register Description
======================= ========= =============================================
0x8030 0000 0600 0000 f[0] Floating point register 0
...
0x8030 0000 0600 001f f[31] Floating point register 31
0x8020 0000 0600 0020 fcsr Floating point control and status register
======================= ========= =============================================
4.69 KVM_GET_ONE_REG
--------------------
@ -5848,6 +6004,25 @@ Valid values for 'type' are:
Userspace is expected to place the hypercall result into the appropriate
field before invoking KVM_RUN again.
::
/* KVM_EXIT_RISCV_SBI */
struct {
unsigned long extension_id;
unsigned long function_id;
unsigned long args[6];
unsigned long ret[2];
} riscv_sbi;
If exit reason is KVM_EXIT_RISCV_SBI then it indicates that the VCPU has
done a SBI call which is not handled by KVM RISC-V kernel module. The details
of the SBI call are available in 'riscv_sbi' member of kvm_run structure. The
'extension_id' field of 'riscv_sbi' represents SBI extension ID whereas the
'function_id' field represents function ID of given SBI extension. The 'args'
array field of 'riscv_sbi' represents parameters for the SBI call and 'ret'
array field represents return values. The userspace should update the return
values of SBI call before resuming the VCPU. For more details on RISC-V SBI
spec refer, https://github.com/riscv/riscv-sbi-doc.
::
/* Fix the size of the union. */

12
MAINTAINERS
Просмотреть файл

@ -10270,6 +10270,18 @@ F: arch/powerpc/include/uapi/asm/kvm*
F: arch/powerpc/kernel/kvm*
F: arch/powerpc/kvm/
KERNEL VIRTUAL MACHINE FOR RISC-V (KVM/riscv)
M: Anup Patel <anup.patel@wdc.com>
R: Atish Patra <atish.patra@wdc.com>
L: kvm@vger.kernel.org
L: kvm-riscv@lists.infradead.org
L: linux-riscv@lists.infradead.org
S: Maintained
T: git git://github.com/kvm-riscv/linux.git
F: arch/riscv/include/asm/kvm*
F: arch/riscv/include/uapi/asm/kvm*
F: arch/riscv/kvm/
KERNEL VIRTUAL MACHINE for s390 (KVM/s390)
M: Christian Borntraeger <borntraeger@de.ibm.com>
M: Janosch Frank <frankja@linux.ibm.com>

1
arch/riscv/Kconfig
Просмотреть файл

@ -562,4 +562,5 @@ source "kernel/power/Kconfig"
endmenu
source "arch/riscv/kvm/Kconfig"
source "drivers/firmware/Kconfig"

1
arch/riscv/Makefile
Просмотреть файл

@ -100,6 +100,7 @@ endif
head-y := arch/riscv/kernel/head.o
core-$(CONFIG_RISCV_ERRATA_ALTERNATIVE) += arch/riscv/errata/
core-$(CONFIG_KVM) += arch/riscv/kvm/
libs-y += arch/riscv/lib/
libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a

87
arch/riscv/include/asm/csr.h
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@ -58,22 +58,32 @@
/* Interrupt causes (minus the high bit) */
#define IRQ_S_SOFT 1
#define IRQ_VS_SOFT 2
#define IRQ_M_SOFT 3
#define IRQ_S_TIMER 5
#define IRQ_VS_TIMER 6
#define IRQ_M_TIMER 7
#define IRQ_S_EXT 9
#define IRQ_VS_EXT 10
#define IRQ_M_EXT 11
/* Exception causes */
#define EXC_INST_MISALIGNED 0
#define EXC_INST_ACCESS 1
#define EXC_INST_ILLEGAL 2
#define EXC_BREAKPOINT 3
#define EXC_LOAD_ACCESS 5
#define EXC_STORE_ACCESS 7
#define EXC_SYSCALL 8
#define EXC_HYPERVISOR_SYSCALL 9
#define EXC_SUPERVISOR_SYSCALL 10
#define EXC_INST_PAGE_FAULT 12
#define EXC_LOAD_PAGE_FAULT 13
#define EXC_STORE_PAGE_FAULT 15
#define EXC_INST_GUEST_PAGE_FAULT 20
#define EXC_LOAD_GUEST_PAGE_FAULT 21
#define EXC_VIRTUAL_INST_FAULT 22
#define EXC_STORE_GUEST_PAGE_FAULT 23
/* PMP configuration */
#define PMP_R 0x01
@ -85,6 +95,58 @@
#define PMP_A_NAPOT 0x18
#define PMP_L 0x80
/* HSTATUS flags */
#ifdef CONFIG_64BIT
#define HSTATUS_VSXL _AC(0x300000000, UL)
#define HSTATUS_VSXL_SHIFT 32
#endif
#define HSTATUS_VTSR _AC(0x00400000, UL)
#define HSTATUS_VTW _AC(0x00200000, UL)
#define HSTATUS_VTVM _AC(0x00100000, UL)
#define HSTATUS_VGEIN _AC(0x0003f000, UL)
#define HSTATUS_VGEIN_SHIFT 12
#define HSTATUS_HU _AC(0x00000200, UL)
#define HSTATUS_SPVP _AC(0x00000100, UL)
#define HSTATUS_SPV _AC(0x00000080, UL)
#define HSTATUS_GVA _AC(0x00000040, UL)
#define HSTATUS_VSBE _AC(0x00000020, UL)
/* HGATP flags */
#define HGATP_MODE_OFF _AC(0, UL)
#define HGATP_MODE_SV32X4 _AC(1, UL)
#define HGATP_MODE_SV39X4 _AC(8, UL)
#define HGATP_MODE_SV48X4 _AC(9, UL)
#define HGATP32_MODE_SHIFT 31
#define HGATP32_VMID_SHIFT 22
#define HGATP32_VMID_MASK _AC(0x1FC00000, UL)
#define HGATP32_PPN _AC(0x003FFFFF, UL)
#define HGATP64_MODE_SHIFT 60
#define HGATP64_VMID_SHIFT 44
#define HGATP64_VMID_MASK _AC(0x03FFF00000000000, UL)
#define HGATP64_PPN _AC(0x00000FFFFFFFFFFF, UL)
#define HGATP_PAGE_SHIFT 12
#ifdef CONFIG_64BIT
#define HGATP_PPN HGATP64_PPN
#define HGATP_VMID_SHIFT HGATP64_VMID_SHIFT
#define HGATP_VMID_MASK HGATP64_VMID_MASK
#define HGATP_MODE_SHIFT HGATP64_MODE_SHIFT
#else
#define HGATP_PPN HGATP32_PPN
#define HGATP_VMID_SHIFT HGATP32_VMID_SHIFT
#define HGATP_VMID_MASK HGATP32_VMID_MASK
#define HGATP_MODE_SHIFT HGATP32_MODE_SHIFT
#endif
/* VSIP & HVIP relation */
#define VSIP_TO_HVIP_SHIFT (IRQ_VS_SOFT - IRQ_S_SOFT)
#define VSIP_VALID_MASK ((_AC(1, UL) << IRQ_S_SOFT) | \
(_AC(1, UL) << IRQ_S_TIMER) | \
(_AC(1, UL) << IRQ_S_EXT))
/* symbolic CSR names: */
#define CSR_CYCLE 0xc00
#define CSR_TIME 0xc01
@ -104,6 +166,31 @@
#define CSR_SIP 0x144
#define CSR_SATP 0x180
#define CSR_VSSTATUS 0x200
#define CSR_VSIE 0x204
#define CSR_VSTVEC 0x205
#define CSR_VSSCRATCH 0x240
#define CSR_VSEPC 0x241
#define CSR_VSCAUSE 0x242
#define CSR_VSTVAL 0x243
#define CSR_VSIP 0x244
#define CSR_VSATP 0x280
#define CSR_HSTATUS 0x600
#define CSR_HEDELEG 0x602
#define CSR_HIDELEG 0x603
#define CSR_HIE 0x604
#define CSR_HTIMEDELTA 0x605
#define CSR_HCOUNTEREN 0x606
#define CSR_HGEIE 0x607
#define CSR_HTIMEDELTAH 0x615
#define CSR_HTVAL 0x643
#define CSR_HIP 0x644
#define CSR_HVIP 0x645
#define CSR_HTINST 0x64a
#define CSR_HGATP 0x680
#define CSR_HGEIP 0xe12
#define CSR_MSTATUS 0x300
#define CSR_MISA 0x301
#define CSR_MIE 0x304

266
arch/riscv/include/asm/kvm_host.h Normal file
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@ -0,0 +1,266 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#ifndef __RISCV_KVM_HOST_H__
#define __RISCV_KVM_HOST_H__
#include <linux/types.h>
#include <linux/kvm.h>
#include <linux/kvm_types.h>
#include <asm/kvm_vcpu_timer.h>
#ifdef CONFIG_64BIT
#define KVM_MAX_VCPUS (1U << 16)
#else
#define KVM_MAX_VCPUS (1U << 9)
#endif
#define KVM_HALT_POLL_NS_DEFAULT 500000
#define KVM_VCPU_MAX_FEATURES 0
#define KVM_REQ_SLEEP \
KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_VCPU_RESET KVM_ARCH_REQ(1)
#define KVM_REQ_UPDATE_HGATP KVM_ARCH_REQ(2)
struct kvm_vm_stat {
struct kvm_vm_stat_generic generic;
};
struct kvm_vcpu_stat {
struct kvm_vcpu_stat_generic generic;
u64 ecall_exit_stat;
u64 wfi_exit_stat;
u64 mmio_exit_user;
u64 mmio_exit_kernel;
u64 exits;
};
struct kvm_arch_memory_slot {
};
struct kvm_vmid {
/*
* Writes to vmid_version and vmid happen with vmid_lock held
* whereas reads happen without any lock held.
*/
unsigned long vmid_version;
unsigned long vmid;
};
struct kvm_arch {
/* stage2 vmid */
struct kvm_vmid vmid;
/* stage2 page table */
pgd_t *pgd;
phys_addr_t pgd_phys;
/* Guest Timer */
struct kvm_guest_timer timer;
};
struct kvm_mmio_decode {
unsigned long insn;
int insn_len;
int len;
int shift;
int return_handled;
};
struct kvm_sbi_context {
int return_handled;
};
#define KVM_MMU_PAGE_CACHE_NR_OBJS 32
struct kvm_mmu_page_cache {
int nobjs;
void *objects[KVM_MMU_PAGE_CACHE_NR_OBJS];
};
struct kvm_cpu_trap {
unsigned long sepc;
unsigned long scause;
unsigned long stval;
unsigned long htval;
unsigned long htinst;
};
struct kvm_cpu_context {
unsigned long zero;
unsigned long ra;
unsigned long sp;
unsigned long gp;
unsigned long tp;
unsigned long t0;
unsigned long t1;
unsigned long t2;
unsigned long s0;
unsigned long s1;
unsigned long a0;
unsigned long a1;
unsigned long a2;
unsigned long a3;
unsigned long a4;
unsigned long a5;
unsigned long a6;
unsigned long a7;
unsigned long s2;
unsigned long s3;
unsigned long s4;
unsigned long s5;
unsigned long s6;
unsigned long s7;
unsigned long s8;
unsigned long s9;
unsigned long s10;
unsigned long s11;
unsigned long t3;
unsigned long t4;
unsigned long t5;
unsigned long t6;
unsigned long sepc;
unsigned long sstatus;
unsigned long hstatus;
union __riscv_fp_state fp;
};
struct kvm_vcpu_csr {
unsigned long vsstatus;
unsigned long vsie;
unsigned long vstvec;
unsigned long vsscratch;
unsigned long vsepc;
unsigned long vscause;
unsigned long vstval;
unsigned long hvip;
unsigned long vsatp;
unsigned long scounteren;
};
struct kvm_vcpu_arch {
/* VCPU ran at least once */
bool ran_atleast_once;
/* ISA feature bits (similar to MISA) */
unsigned long isa;
/* SSCRATCH, STVEC, and SCOUNTEREN of Host */
unsigned long host_sscratch;
unsigned long host_stvec;
unsigned long host_scounteren;
/* CPU context of Host */
struct kvm_cpu_context host_context;
/* CPU context of Guest VCPU */
struct kvm_cpu_context guest_context;
/* CPU CSR context of Guest VCPU */
struct kvm_vcpu_csr guest_csr;
/* CPU context upon Guest VCPU reset */
struct kvm_cpu_context guest_reset_context;
/* CPU CSR context upon Guest VCPU reset */
struct kvm_vcpu_csr guest_reset_csr;
/*
* VCPU interrupts
*
* We have a lockless approach for tracking pending VCPU interrupts
* implemented using atomic bitops. The irqs_pending bitmap represent
* pending interrupts whereas irqs_pending_mask represent bits changed
* in irqs_pending. Our approach is modeled around multiple producer
* and single consumer problem where the consumer is the VCPU itself.
*/
unsigned long irqs_pending;
unsigned long irqs_pending_mask;
/* VCPU Timer */
struct kvm_vcpu_timer timer;
/* MMIO instruction details */
struct kvm_mmio_decode mmio_decode;
/* SBI context */
struct kvm_sbi_context sbi_context;
/* Cache pages needed to program page tables with spinlock held */
struct kvm_mmu_page_cache mmu_page_cache;
/* VCPU power-off state */
bool power_off;
/* Don't run the VCPU (blocked) */
bool pause;
/* SRCU lock index for in-kernel run loop */
int srcu_idx;
};
static inline void kvm_arch_hardware_unsetup(void) {}
static inline void kvm_arch_sync_events(struct kvm *kvm) {}
static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
#define KVM_ARCH_WANT_MMU_NOTIFIER
void __kvm_riscv_hfence_gvma_vmid_gpa(unsigned long gpa, unsigned long vmid);
void __kvm_riscv_hfence_gvma_vmid(unsigned long vmid);
void __kvm_riscv_hfence_gvma_gpa(unsigned long gpa);
void __kvm_riscv_hfence_gvma_all(void);
int kvm_riscv_stage2_map(struct kvm_vcpu *vcpu,
struct kvm_memory_slot *memslot,
gpa_t gpa, unsigned long hva, bool is_write);
void kvm_riscv_stage2_flush_cache(struct kvm_vcpu *vcpu);
int kvm_riscv_stage2_alloc_pgd(struct kvm *kvm);
void kvm_riscv_stage2_free_pgd(struct kvm *kvm);
void kvm_riscv_stage2_update_hgatp(struct kvm_vcpu *vcpu);
void kvm_riscv_stage2_mode_detect(void);
unsigned long kvm_riscv_stage2_mode(void);
void kvm_riscv_stage2_vmid_detect(void);
unsigned long kvm_riscv_stage2_vmid_bits(void);
int kvm_riscv_stage2_vmid_init(struct kvm *kvm);
bool kvm_riscv_stage2_vmid_ver_changed(struct kvm_vmid *vmid);
void kvm_riscv_stage2_vmid_update(struct kvm_vcpu *vcpu);
void __kvm_riscv_unpriv_trap(void);
unsigned long kvm_riscv_vcpu_unpriv_read(struct kvm_vcpu *vcpu,
bool read_insn,
unsigned long guest_addr,
struct kvm_cpu_trap *trap);
void kvm_riscv_vcpu_trap_redirect(struct kvm_vcpu *vcpu,
struct kvm_cpu_trap *trap);
int kvm_riscv_vcpu_mmio_return(struct kvm_vcpu *vcpu, struct kvm_run *run);
int kvm_riscv_vcpu_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
struct kvm_cpu_trap *trap);
void __kvm_riscv_switch_to(struct kvm_vcpu_arch *vcpu_arch);
void __kvm_riscv_fp_f_save(struct kvm_cpu_context *context);
void __kvm_riscv_fp_f_restore(struct kvm_cpu_context *context);
void __kvm_riscv_fp_d_save(struct kvm_cpu_context *context);
void __kvm_riscv_fp_d_restore(struct kvm_cpu_context *context);
int kvm_riscv_vcpu_set_interrupt(struct kvm_vcpu *vcpu, unsigned int irq);
int kvm_riscv_vcpu_unset_interrupt(struct kvm_vcpu *vcpu, unsigned int irq);
void kvm_riscv_vcpu_flush_interrupts(struct kvm_vcpu *vcpu);
void kvm_riscv_vcpu_sync_interrupts(struct kvm_vcpu *vcpu);
bool kvm_riscv_vcpu_has_interrupts(struct kvm_vcpu *vcpu, unsigned long mask);
void kvm_riscv_vcpu_power_off(struct kvm_vcpu *vcpu);
void kvm_riscv_vcpu_power_on(struct kvm_vcpu *vcpu);
int kvm_riscv_vcpu_sbi_return(struct kvm_vcpu *vcpu, struct kvm_run *run);
int kvm_riscv_vcpu_sbi_ecall(struct kvm_vcpu *vcpu, struct kvm_run *run);
#endif /* __RISCV_KVM_HOST_H__ */

7
arch/riscv/include/asm/kvm_types.h Normal file
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@ -0,0 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_RISCV_KVM_TYPES_H
#define _ASM_RISCV_KVM_TYPES_H
#define KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE 40
#endif /* _ASM_RISCV_KVM_TYPES_H */

44
arch/riscv/include/asm/kvm_vcpu_timer.h Normal file
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@ -0,0 +1,44 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Atish Patra <atish.patra@wdc.com>
*/
#ifndef __KVM_VCPU_RISCV_TIMER_H
#define __KVM_VCPU_RISCV_TIMER_H
#include <linux/hrtimer.h>
struct kvm_guest_timer {
/* Mult & Shift values to get nanoseconds from cycles */
u32 nsec_mult;
u32 nsec_shift;
/* Time delta value */
u64 time_delta;
};
struct kvm_vcpu_timer {
/* Flag for whether init is done */
bool init_done;
/* Flag for whether timer event is configured */
bool next_set;
/* Next timer event cycles */
u64 next_cycles;
/* Underlying hrtimer instance */
struct hrtimer hrt;
};
int kvm_riscv_vcpu_timer_next_event(struct kvm_vcpu *vcpu, u64 ncycles);
int kvm_riscv_vcpu_get_reg_timer(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg);
int kvm_riscv_vcpu_set_reg_timer(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg);
int kvm_riscv_vcpu_timer_init(struct kvm_vcpu *vcpu);
int kvm_riscv_vcpu_timer_deinit(struct kvm_vcpu *vcpu);
int kvm_riscv_vcpu_timer_reset(struct kvm_vcpu *vcpu);
void kvm_riscv_vcpu_timer_restore(struct kvm_vcpu *vcpu);
int kvm_riscv_guest_timer_init(struct kvm *kvm);
#endif

128
arch/riscv/include/uapi/asm/kvm.h Normal file
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@ -0,0 +1,128 @@
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* Copyright (C) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#ifndef __LINUX_KVM_RISCV_H
#define __LINUX_KVM_RISCV_H
#ifndef __ASSEMBLY__
#include <linux/types.h>
#include <asm/ptrace.h>
#define __KVM_HAVE_READONLY_MEM
#define KVM_COALESCED_MMIO_PAGE_OFFSET 1
#define KVM_INTERRUPT_SET -1U
#define KVM_INTERRUPT_UNSET -2U
/* for KVM_GET_REGS and KVM_SET_REGS */
struct kvm_regs {
};
/* for KVM_GET_FPU and KVM_SET_FPU */
struct kvm_fpu {
};
/* KVM Debug exit structure */
struct kvm_debug_exit_arch {
};
/* for KVM_SET_GUEST_DEBUG */
struct kvm_guest_debug_arch {
};
/* definition of registers in kvm_run */
struct kvm_sync_regs {
};
/* for KVM_GET_SREGS and KVM_SET_SREGS */
struct kvm_sregs {
};
/* CONFIG registers for KVM_GET_ONE_REG and KVM_SET_ONE_REG */
struct kvm_riscv_config {
unsigned long isa;
};
/* CORE registers for KVM_GET_ONE_REG and KVM_SET_ONE_REG */
struct kvm_riscv_core {
struct user_regs_struct regs;
unsigned long mode;
};
/* Possible privilege modes for kvm_riscv_core */
#define KVM_RISCV_MODE_S 1
#define KVM_RISCV_MODE_U 0
/* CSR registers for KVM_GET_ONE_REG and KVM_SET_ONE_REG */
struct kvm_riscv_csr {
unsigned long sstatus;
unsigned long sie;
unsigned long stvec;
unsigned long sscratch;
unsigned long sepc;
unsigned long scause;
unsigned long stval;
unsigned long sip;
unsigned long satp;
unsigned long scounteren;
};
/* TIMER registers for KVM_GET_ONE_REG and KVM_SET_ONE_REG */
struct kvm_riscv_timer {
__u64 frequency;
__u64 time;
__u64 compare;
__u64 state;
};
/* Possible states for kvm_riscv_timer */
#define KVM_RISCV_TIMER_STATE_OFF 0
#define KVM_RISCV_TIMER_STATE_ON 1
#define KVM_REG_SIZE(id) \
(1U << (((id) & KVM_REG_SIZE_MASK) >> KVM_REG_SIZE_SHIFT))
/* If you need to interpret the index values, here is the key: */
#define KVM_REG_RISCV_TYPE_MASK 0x00000000FF000000
#define KVM_REG_RISCV_TYPE_SHIFT 24
/* Config registers are mapped as type 1 */
#define KVM_REG_RISCV_CONFIG (0x01 << KVM_REG_RISCV_TYPE_SHIFT)
#define KVM_REG_RISCV_CONFIG_REG(name) \
(offsetof(struct kvm_riscv_config, name) / sizeof(unsigned long))
/* Core registers are mapped as type 2 */
#define KVM_REG_RISCV_CORE (0x02 << KVM_REG_RISCV_TYPE_SHIFT)
#define KVM_REG_RISCV_CORE_REG(name) \
(offsetof(struct kvm_riscv_core, name) / sizeof(unsigned long))
/* Control and status registers are mapped as type 3 */
#define KVM_REG_RISCV_CSR (0x03 << KVM_REG_RISCV_TYPE_SHIFT)
#define KVM_REG_RISCV_CSR_REG(name) \
(offsetof(struct kvm_riscv_csr, name) / sizeof(unsigned long))
/* Timer registers are mapped as type 4 */
#define KVM_REG_RISCV_TIMER (0x04 << KVM_REG_RISCV_TYPE_SHIFT)
#define KVM_REG_RISCV_TIMER_REG(name) \
(offsetof(struct kvm_riscv_timer, name) / sizeof(__u64))
/* F extension registers are mapped as type 5 */
#define KVM_REG_RISCV_FP_F (0x05 << KVM_REG_RISCV_TYPE_SHIFT)
#define KVM_REG_RISCV_FP_F_REG(name) \
(offsetof(struct __riscv_f_ext_state, name) / sizeof(__u32))
/* D extension registers are mapped as type 6 */
#define KVM_REG_RISCV_FP_D (0x06 << KVM_REG_RISCV_TYPE_SHIFT)
#define KVM_REG_RISCV_FP_D_REG(name) \
(offsetof(struct __riscv_d_ext_state, name) / sizeof(__u64))
#endif
#endif /* __LINUX_KVM_RISCV_H */

156
arch/riscv/kernel/asm-offsets.c
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@ -7,7 +7,9 @@
#define GENERATING_ASM_OFFSETS
#include <linux/kbuild.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <asm/kvm_host.h>
#include <asm/thread_info.h>
#include <asm/ptrace.h>
@ -111,6 +113,160 @@ void asm_offsets(void)
OFFSET(PT_BADADDR, pt_regs, badaddr);
OFFSET(PT_CAUSE, pt_regs, cause);
OFFSET(KVM_ARCH_GUEST_ZERO, kvm_vcpu_arch, guest_context.zero);
OFFSET(KVM_ARCH_GUEST_RA, kvm_vcpu_arch, guest_context.ra);
OFFSET(KVM_ARCH_GUEST_SP, kvm_vcpu_arch, guest_context.sp);
OFFSET(KVM_ARCH_GUEST_GP, kvm_vcpu_arch, guest_context.gp);
OFFSET(KVM_ARCH_GUEST_TP, kvm_vcpu_arch, guest_context.tp);
OFFSET(KVM_ARCH_GUEST_T0, kvm_vcpu_arch, guest_context.t0);
OFFSET(KVM_ARCH_GUEST_T1, kvm_vcpu_arch, guest_context.t1);
OFFSET(KVM_ARCH_GUEST_T2, kvm_vcpu_arch, guest_context.t2);
OFFSET(KVM_ARCH_GUEST_S0, kvm_vcpu_arch, guest_context.s0);
OFFSET(KVM_ARCH_GUEST_S1, kvm_vcpu_arch, guest_context.s1);
OFFSET(KVM_ARCH_GUEST_A0, kvm_vcpu_arch, guest_context.a0);
OFFSET(KVM_ARCH_GUEST_A1, kvm_vcpu_arch, guest_context.a1);
OFFSET(KVM_ARCH_GUEST_A2, kvm_vcpu_arch, guest_context.a2);
OFFSET(KVM_ARCH_GUEST_A3, kvm_vcpu_arch, guest_context.a3);
OFFSET(KVM_ARCH_GUEST_A4, kvm_vcpu_arch, guest_context.a4);
OFFSET(KVM_ARCH_GUEST_A5, kvm_vcpu_arch, guest_context.a5);
OFFSET(KVM_ARCH_GUEST_A6, kvm_vcpu_arch, guest_context.a6);
OFFSET(KVM_ARCH_GUEST_A7, kvm_vcpu_arch, guest_context.a7);
OFFSET(KVM_ARCH_GUEST_S2, kvm_vcpu_arch, guest_context.s2);
OFFSET(KVM_ARCH_GUEST_S3, kvm_vcpu_arch, guest_context.s3);
OFFSET(KVM_ARCH_GUEST_S4, kvm_vcpu_arch, guest_context.s4);
OFFSET(KVM_ARCH_GUEST_S5, kvm_vcpu_arch, guest_context.s5);
OFFSET(KVM_ARCH_GUEST_S6, kvm_vcpu_arch, guest_context.s6);
OFFSET(KVM_ARCH_GUEST_S7, kvm_vcpu_arch, guest_context.s7);
OFFSET(KVM_ARCH_GUEST_S8, kvm_vcpu_arch, guest_context.s8);
OFFSET(KVM_ARCH_GUEST_S9, kvm_vcpu_arch, guest_context.s9);
OFFSET(KVM_ARCH_GUEST_S10, kvm_vcpu_arch, guest_context.s10);
OFFSET(KVM_ARCH_GUEST_S11, kvm_vcpu_arch, guest_context.s11);
OFFSET(KVM_ARCH_GUEST_T3, kvm_vcpu_arch, guest_context.t3);
OFFSET(KVM_ARCH_GUEST_T4, kvm_vcpu_arch, guest_context.t4);
OFFSET(KVM_ARCH_GUEST_T5, kvm_vcpu_arch, guest_context.t5);
OFFSET(KVM_ARCH_GUEST_T6, kvm_vcpu_arch, guest_context.t6);
OFFSET(KVM_ARCH_GUEST_SEPC, kvm_vcpu_arch, guest_context.sepc);
OFFSET(KVM_ARCH_GUEST_SSTATUS, kvm_vcpu_arch, guest_context.sstatus);
OFFSET(KVM_ARCH_GUEST_HSTATUS, kvm_vcpu_arch, guest_context.hstatus);
OFFSET(KVM_ARCH_GUEST_SCOUNTEREN, kvm_vcpu_arch, guest_csr.scounteren);
OFFSET(KVM_ARCH_HOST_ZERO, kvm_vcpu_arch, host_context.zero);
OFFSET(KVM_ARCH_HOST_RA, kvm_vcpu_arch, host_context.ra);
OFFSET(KVM_ARCH_HOST_SP, kvm_vcpu_arch, host_context.sp);
OFFSET(KVM_ARCH_HOST_GP, kvm_vcpu_arch, host_context.gp);
OFFSET(KVM_ARCH_HOST_TP, kvm_vcpu_arch, host_context.tp);
OFFSET(KVM_ARCH_HOST_T0, kvm_vcpu_arch, host_context.t0);
OFFSET(KVM_ARCH_HOST_T1, kvm_vcpu_arch, host_context.t1);
OFFSET(KVM_ARCH_HOST_T2, kvm_vcpu_arch, host_context.t2);
OFFSET(KVM_ARCH_HOST_S0, kvm_vcpu_arch, host_context.s0);
OFFSET(KVM_ARCH_HOST_S1, kvm_vcpu_arch, host_context.s1);
OFFSET(KVM_ARCH_HOST_A0, kvm_vcpu_arch, host_context.a0);
OFFSET(KVM_ARCH_HOST_A1, kvm_vcpu_arch, host_context.a1);
OFFSET(KVM_ARCH_HOST_A2, kvm_vcpu_arch, host_context.a2);
OFFSET(KVM_ARCH_HOST_A3, kvm_vcpu_arch, host_context.a3);
OFFSET(KVM_ARCH_HOST_A4, kvm_vcpu_arch, host_context.a4);
OFFSET(KVM_ARCH_HOST_A5, kvm_vcpu_arch, host_context.a5);
OFFSET(KVM_ARCH_HOST_A6, kvm_vcpu_arch, host_context.a6);
OFFSET(KVM_ARCH_HOST_A7, kvm_vcpu_arch, host_context.a7);
OFFSET(KVM_ARCH_HOST_S2, kvm_vcpu_arch, host_context.s2);
OFFSET(KVM_ARCH_HOST_S3, kvm_vcpu_arch, host_context.s3);
OFFSET(KVM_ARCH_HOST_S4, kvm_vcpu_arch, host_context.s4);
OFFSET(KVM_ARCH_HOST_S5, kvm_vcpu_arch, host_context.s5);
OFFSET(KVM_ARCH_HOST_S6, kvm_vcpu_arch, host_context.s6);
OFFSET(KVM_ARCH_HOST_S7, kvm_vcpu_arch, host_context.s7);
OFFSET(KVM_ARCH_HOST_S8, kvm_vcpu_arch, host_context.s8);
OFFSET(KVM_ARCH_HOST_S9, kvm_vcpu_arch, host_context.s9);
OFFSET(KVM_ARCH_HOST_S10, kvm_vcpu_arch, host_context.s10);
OFFSET(KVM_ARCH_HOST_S11, kvm_vcpu_arch, host_context.s11);
OFFSET(KVM_ARCH_HOST_T3, kvm_vcpu_arch, host_context.t3);
OFFSET(KVM_ARCH_HOST_T4, kvm_vcpu_arch, host_context.t4);
OFFSET(KVM_ARCH_HOST_T5, kvm_vcpu_arch, host_context.t5);
OFFSET(KVM_ARCH_HOST_T6, kvm_vcpu_arch, host_context.t6);
OFFSET(KVM_ARCH_HOST_SEPC, kvm_vcpu_arch, host_context.sepc);
OFFSET(KVM_ARCH_HOST_SSTATUS, kvm_vcpu_arch, host_context.sstatus);
OFFSET(KVM_ARCH_HOST_HSTATUS, kvm_vcpu_arch, host_context.hstatus);
OFFSET(KVM_ARCH_HOST_SSCRATCH, kvm_vcpu_arch, host_sscratch);
OFFSET(KVM_ARCH_HOST_STVEC, kvm_vcpu_arch, host_stvec);
OFFSET(KVM_ARCH_HOST_SCOUNTEREN, kvm_vcpu_arch, host_scounteren);
OFFSET(KVM_ARCH_TRAP_SEPC, kvm_cpu_trap, sepc);
OFFSET(KVM_ARCH_TRAP_SCAUSE, kvm_cpu_trap, scause);
OFFSET(KVM_ARCH_TRAP_STVAL, kvm_cpu_trap, stval);
OFFSET(KVM_ARCH_TRAP_HTVAL, kvm_cpu_trap, htval);
OFFSET(KVM_ARCH_TRAP_HTINST, kvm_cpu_trap, htinst);
/* F extension */
OFFSET(KVM_ARCH_FP_F_F0, kvm_cpu_context, fp.f.f[0]);
OFFSET(KVM_ARCH_FP_F_F1, kvm_cpu_context, fp.f.f[1]);
OFFSET(KVM_ARCH_FP_F_F2, kvm_cpu_context, fp.f.f[2]);
OFFSET(KVM_ARCH_FP_F_F3, kvm_cpu_context, fp.f.f[3]);
OFFSET(KVM_ARCH_FP_F_F4, kvm_cpu_context, fp.f.f[4]);
OFFSET(KVM_ARCH_FP_F_F5, kvm_cpu_context, fp.f.f[5]);
OFFSET(KVM_ARCH_FP_F_F6, kvm_cpu_context, fp.f.f[6]);
OFFSET(KVM_ARCH_FP_F_F7, kvm_cpu_context, fp.f.f[7]);
OFFSET(KVM_ARCH_FP_F_F8, kvm_cpu_context, fp.f.f[8]);
OFFSET(KVM_ARCH_FP_F_F9, kvm_cpu_context, fp.f.f[9]);
OFFSET(KVM_ARCH_FP_F_F10, kvm_cpu_context, fp.f.f[10]);
OFFSET(KVM_ARCH_FP_F_F11, kvm_cpu_context, fp.f.f[11]);
OFFSET(KVM_ARCH_FP_F_F12, kvm_cpu_context, fp.f.f[12]);
OFFSET(KVM_ARCH_FP_F_F13, kvm_cpu_context, fp.f.f[13]);
OFFSET(KVM_ARCH_FP_F_F14, kvm_cpu_context, fp.f.f[14]);
OFFSET(KVM_ARCH_FP_F_F15, kvm_cpu_context, fp.f.f[15]);
OFFSET(KVM_ARCH_FP_F_F16, kvm_cpu_context, fp.f.f[16]);
OFFSET(KVM_ARCH_FP_F_F17, kvm_cpu_context, fp.f.f[17]);
OFFSET(KVM_ARCH_FP_F_F18, kvm_cpu_context, fp.f.f[18]);
OFFSET(KVM_ARCH_FP_F_F19, kvm_cpu_context, fp.f.f[19]);
OFFSET(KVM_ARCH_FP_F_F20, kvm_cpu_context, fp.f.f[20]);
OFFSET(KVM_ARCH_FP_F_F21, kvm_cpu_context, fp.f.f[21]);
OFFSET(KVM_ARCH_FP_F_F22, kvm_cpu_context, fp.f.f[22]);
OFFSET(KVM_ARCH_FP_F_F23, kvm_cpu_context, fp.f.f[23]);
OFFSET(KVM_ARCH_FP_F_F24, kvm_cpu_context, fp.f.f[24]);
OFFSET(KVM_ARCH_FP_F_F25, kvm_cpu_context, fp.f.f[25]);
OFFSET(KVM_ARCH_FP_F_F26, kvm_cpu_context, fp.f.f[26]);
OFFSET(KVM_ARCH_FP_F_F27, kvm_cpu_context, fp.f.f[27]);
OFFSET(KVM_ARCH_FP_F_F28, kvm_cpu_context, fp.f.f[28]);
OFFSET(KVM_ARCH_FP_F_F29, kvm_cpu_context, fp.f.f[29]);
OFFSET(KVM_ARCH_FP_F_F30, kvm_cpu_context, fp.f.f[30]);
OFFSET(KVM_ARCH_FP_F_F31, kvm_cpu_context, fp.f.f[31]);
OFFSET(KVM_ARCH_FP_F_FCSR, kvm_cpu_context, fp.f.fcsr);
/* D extension */
OFFSET(KVM_ARCH_FP_D_F0, kvm_cpu_context, fp.d.f[0]);
OFFSET(KVM_ARCH_FP_D_F1, kvm_cpu_context, fp.d.f[1]);
OFFSET(KVM_ARCH_FP_D_F2, kvm_cpu_context, fp.d.f[2]);
OFFSET(KVM_ARCH_FP_D_F3, kvm_cpu_context, fp.d.f[3]);
OFFSET(KVM_ARCH_FP_D_F4, kvm_cpu_context, fp.d.f[4]);
OFFSET(KVM_ARCH_FP_D_F5, kvm_cpu_context, fp.d.f[5]);
OFFSET(KVM_ARCH_FP_D_F6, kvm_cpu_context, fp.d.f[6]);
OFFSET(KVM_ARCH_FP_D_F7, kvm_cpu_context, fp.d.f[7]);
OFFSET(KVM_ARCH_FP_D_F8, kvm_cpu_context, fp.d.f[8]);
OFFSET(KVM_ARCH_FP_D_F9, kvm_cpu_context, fp.d.f[9]);
OFFSET(KVM_ARCH_FP_D_F10, kvm_cpu_context, fp.d.f[10]);
OFFSET(KVM_ARCH_FP_D_F11, kvm_cpu_context, fp.d.f[11]);
OFFSET(KVM_ARCH_FP_D_F12, kvm_cpu_context, fp.d.f[12]);
OFFSET(KVM_ARCH_FP_D_F13, kvm_cpu_context, fp.d.f[13]);
OFFSET(KVM_ARCH_FP_D_F14, kvm_cpu_context, fp.d.f[14]);
OFFSET(KVM_ARCH_FP_D_F15, kvm_cpu_context, fp.d.f[15]);
OFFSET(KVM_ARCH_FP_D_F16, kvm_cpu_context, fp.d.f[16]);
OFFSET(KVM_ARCH_FP_D_F17, kvm_cpu_context, fp.d.f[17]);
OFFSET(KVM_ARCH_FP_D_F18, kvm_cpu_context, fp.d.f[18]);
OFFSET(KVM_ARCH_FP_D_F19, kvm_cpu_context, fp.d.f[19]);
OFFSET(KVM_ARCH_FP_D_F20, kvm_cpu_context, fp.d.f[20]);
OFFSET(KVM_ARCH_FP_D_F21, kvm_cpu_context, fp.d.f[21]);
OFFSET(KVM_ARCH_FP_D_F22, kvm_cpu_context, fp.d.f[22]);
OFFSET(KVM_ARCH_FP_D_F23, kvm_cpu_context, fp.d.f[23]);
OFFSET(KVM_ARCH_FP_D_F24, kvm_cpu_context, fp.d.f[24]);
OFFSET(KVM_ARCH_FP_D_F25, kvm_cpu_context, fp.d.f[25]);
OFFSET(KVM_ARCH_FP_D_F26, kvm_cpu_context, fp.d.f[26]);
OFFSET(KVM_ARCH_FP_D_F27, kvm_cpu_context, fp.d.f[27]);
OFFSET(KVM_ARCH_FP_D_F28, kvm_cpu_context, fp.d.f[28]);
OFFSET(KVM_ARCH_FP_D_F29, kvm_cpu_context, fp.d.f[29]);
OFFSET(KVM_ARCH_FP_D_F30, kvm_cpu_context, fp.d.f[30]);
OFFSET(KVM_ARCH_FP_D_F31, kvm_cpu_context, fp.d.f[31]);
OFFSET(KVM_ARCH_FP_D_FCSR, kvm_cpu_context, fp.d.fcsr);
/*
* THREAD_{F,X}* might be larger than a S-type offset can handle, but
* these are used in performance-sensitive assembly so we can't resort

36
arch/riscv/kvm/Kconfig Normal file
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# SPDX-License-Identifier: GPL-2.0
#
# KVM configuration
#
source "virt/kvm/Kconfig"
menuconfig VIRTUALIZATION
bool "Virtualization"
help
Say Y here to get to see options for using your Linux host to run
other operating systems inside virtual machines (guests).
This option alone does not add any kernel code.
If you say N, all options in this submenu will be skipped and
disabled.
if VIRTUALIZATION
config KVM
tristate "Kernel-based Virtual Machine (KVM) support (EXPERIMENTAL)"
depends on RISCV_SBI && MMU
select MMU_NOTIFIER
select PREEMPT_NOTIFIERS
select ANON_INODES
select KVM_MMIO
select KVM_GENERIC_DIRTYLOG_READ_PROTECT
select HAVE_KVM_VCPU_ASYNC_IOCTL
select HAVE_KVM_EVENTFD
select SRCU
help
Support hosting virtualized guest machines.
If unsure, say N.
endif # VIRTUALIZATION

25
arch/riscv/kvm/Makefile Normal file
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# SPDX-License-Identifier: GPL-2.0
#
# Makefile for RISC-V KVM support
#
ccflags-y += -I $(srctree)/$(src)
KVM := ../../../virt/kvm
obj-$(CONFIG_KVM) += kvm.o
kvm-y += $(KVM)/kvm_main.o
kvm-y += $(KVM)/coalesced_mmio.o
kvm-y += $(KVM)/binary_stats.o
kvm-y += $(KVM)/eventfd.o
kvm-y += main.o
kvm-y += vm.o
kvm-y += vmid.o
kvm-y += tlb.o
kvm-y += mmu.o
kvm-y += vcpu.o
kvm-y += vcpu_exit.o
kvm-y += vcpu_switch.o
kvm-y += vcpu_sbi.o
kvm-y += vcpu_timer.o

118
arch/riscv/kvm/main.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/kvm_host.h>
#include <asm/csr.h>
#include <asm/hwcap.h>
#include <asm/sbi.h>
long kvm_arch_dev_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
return -EINVAL;
}
int kvm_arch_check_processor_compat(void *opaque)
{
return 0;
}
int kvm_arch_hardware_setup(void *opaque)
{
return 0;
}
int kvm_arch_hardware_enable(void)
{
unsigned long hideleg, hedeleg;
hedeleg = 0;
hedeleg |= (1UL << EXC_INST_MISALIGNED);
hedeleg |= (1UL << EXC_BREAKPOINT);
hedeleg |= (1UL << EXC_SYSCALL);
hedeleg |= (1UL << EXC_INST_PAGE_FAULT);
hedeleg |= (1UL << EXC_LOAD_PAGE_FAULT);
hedeleg |= (1UL << EXC_STORE_PAGE_FAULT);
csr_write(CSR_HEDELEG, hedeleg);
hideleg = 0;
hideleg |= (1UL << IRQ_VS_SOFT);
hideleg |= (1UL << IRQ_VS_TIMER);
hideleg |= (1UL << IRQ_VS_EXT);
csr_write(CSR_HIDELEG, hideleg);
csr_write(CSR_HCOUNTEREN, -1UL);
csr_write(CSR_HVIP, 0);
return 0;
}
void kvm_arch_hardware_disable(void)
{
csr_write(CSR_HEDELEG, 0);
csr_write(CSR_HIDELEG, 0);
}
int kvm_arch_init(void *opaque)
{
const char *str;
if (!riscv_isa_extension_available(NULL, h)) {
kvm_info("hypervisor extension not available\n");
return -ENODEV;
}
if (sbi_spec_is_0_1()) {
kvm_info("require SBI v0.2 or higher\n");
return -ENODEV;
}
if (sbi_probe_extension(SBI_EXT_RFENCE) <= 0) {
kvm_info("require SBI RFENCE extension\n");
return -ENODEV;
}
kvm_riscv_stage2_mode_detect();
kvm_riscv_stage2_vmid_detect();
kvm_info("hypervisor extension available\n");
switch (kvm_riscv_stage2_mode()) {
case HGATP_MODE_SV32X4:
str = "Sv32x4";
break;
case HGATP_MODE_SV39X4:
str = "Sv39x4";
break;
case HGATP_MODE_SV48X4:
str = "Sv48x4";
break;
default:
return -ENODEV;
}
kvm_info("using %s G-stage page table format\n", str);
kvm_info("VMID %ld bits available\n", kvm_riscv_stage2_vmid_bits());
return 0;
}
void kvm_arch_exit(void)
{
}
static int riscv_kvm_init(void)
{
return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
}
module_init(riscv_kvm_init);

802
arch/riscv/kvm/mmu.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#include <linux/bitops.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/hugetlb.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/kvm_host.h>
#include <linux/sched/signal.h>
#include <asm/csr.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/sbi.h>
#ifdef CONFIG_64BIT
static unsigned long stage2_mode = (HGATP_MODE_SV39X4 << HGATP_MODE_SHIFT);
static unsigned long stage2_pgd_levels = 3;
#define stage2_index_bits 9
#else
static unsigned long stage2_mode = (HGATP_MODE_SV32X4 << HGATP_MODE_SHIFT);
static unsigned long stage2_pgd_levels = 2;
#define stage2_index_bits 10
#endif
#define stage2_pgd_xbits 2
#define stage2_pgd_size (1UL << (HGATP_PAGE_SHIFT + stage2_pgd_xbits))
#define stage2_gpa_bits (HGATP_PAGE_SHIFT + \
(stage2_pgd_levels * stage2_index_bits) + \
stage2_pgd_xbits)
#define stage2_gpa_size ((gpa_t)(1ULL << stage2_gpa_bits))
#define stage2_pte_leaf(__ptep) \
(pte_val(*(__ptep)) & (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC))
static inline unsigned long stage2_pte_index(gpa_t addr, u32 level)
{
unsigned long mask;
unsigned long shift = HGATP_PAGE_SHIFT + (stage2_index_bits * level);
if (level == (stage2_pgd_levels - 1))
mask = (PTRS_PER_PTE * (1UL << stage2_pgd_xbits)) - 1;
else
mask = PTRS_PER_PTE - 1;
return (addr >> shift) & mask;
}
static inline unsigned long stage2_pte_page_vaddr(pte_t pte)
{
return (unsigned long)pfn_to_virt(pte_val(pte) >> _PAGE_PFN_SHIFT);
}
static int stage2_page_size_to_level(unsigned long page_size, u32 *out_level)
{
u32 i;
unsigned long psz = 1UL << 12;
for (i = 0; i < stage2_pgd_levels; i++) {
if (page_size == (psz << (i * stage2_index_bits))) {
*out_level = i;
return 0;
}
}
return -EINVAL;
}
static int stage2_level_to_page_size(u32 level, unsigned long *out_pgsize)
{
if (stage2_pgd_levels < level)
return -EINVAL;
*out_pgsize = 1UL << (12 + (level * stage2_index_bits));
return 0;
}
static int stage2_cache_topup(struct kvm_mmu_page_cache *pcache,
int min, int max)
{
void *page;
BUG_ON(max > KVM_MMU_PAGE_CACHE_NR_OBJS);
if (pcache->nobjs >= min)
return 0;
while (pcache->nobjs < max) {
page = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
if (!page)
return -ENOMEM;
pcache->objects[pcache->nobjs++] = page;
}
return 0;
}
static void stage2_cache_flush(struct kvm_mmu_page_cache *pcache)
{
while (pcache && pcache->nobjs)
free_page((unsigned long)pcache->objects[--pcache->nobjs]);
}
static void *stage2_cache_alloc(struct kvm_mmu_page_cache *pcache)
{
void *p;
if (!pcache)
return NULL;
BUG_ON(!pcache->nobjs);
p = pcache->objects[--pcache->nobjs];
return p;
}
static bool stage2_get_leaf_entry(struct kvm *kvm, gpa_t addr,
pte_t **ptepp, u32 *ptep_level)
{
pte_t *ptep;
u32 current_level = stage2_pgd_levels - 1;
*ptep_level = current_level;
ptep = (pte_t *)kvm->arch.pgd;
ptep = &ptep[stage2_pte_index(addr, current_level)];
while (ptep && pte_val(*ptep)) {
if (stage2_pte_leaf(ptep)) {
*ptep_level = current_level;
*ptepp = ptep;
return true;
}
if (current_level) {
current_level--;
*ptep_level = current_level;
ptep = (pte_t *)stage2_pte_page_vaddr(*ptep);
ptep = &ptep[stage2_pte_index(addr, current_level)];
} else {
ptep = NULL;
}
}
return false;
}
static void stage2_remote_tlb_flush(struct kvm *kvm, u32 level, gpa_t addr)
{
struct cpumask hmask;
unsigned long size = PAGE_SIZE;
struct kvm_vmid *vmid = &kvm->arch.vmid;
if (stage2_level_to_page_size(level, &size))
return;
addr &= ~(size - 1);
/*
* TODO: Instead of cpu_online_mask, we should only target CPUs
* where the Guest/VM is running.
*/
preempt_disable();
riscv_cpuid_to_hartid_mask(cpu_online_mask, &hmask);
sbi_remote_hfence_gvma_vmid(cpumask_bits(&hmask), addr, size,
READ_ONCE(vmid->vmid));
preempt_enable();
}
static int stage2_set_pte(struct kvm *kvm, u32 level,
struct kvm_mmu_page_cache *pcache,
gpa_t addr, const pte_t *new_pte)
{
u32 current_level = stage2_pgd_levels - 1;
pte_t *next_ptep = (pte_t *)kvm->arch.pgd;
pte_t *ptep = &next_ptep[stage2_pte_index(addr, current_level)];
if (current_level < level)
return -EINVAL;
while (current_level != level) {
if (stage2_pte_leaf(ptep))
return -EEXIST;
if (!pte_val(*ptep)) {
next_ptep = stage2_cache_alloc(pcache);
if (!next_ptep)
return -ENOMEM;
*ptep = pfn_pte(PFN_DOWN(__pa(next_ptep)),
__pgprot(_PAGE_TABLE));
} else {
if (stage2_pte_leaf(ptep))
return -EEXIST;
next_ptep = (pte_t *)stage2_pte_page_vaddr(*ptep);
}
current_level--;
ptep = &next_ptep[stage2_pte_index(addr, current_level)];
}
*ptep = *new_pte;
if (stage2_pte_leaf(ptep))
stage2_remote_tlb_flush(kvm, current_level, addr);
return 0;
}
static int stage2_map_page(struct kvm *kvm,
struct kvm_mmu_page_cache *pcache,
gpa_t gpa, phys_addr_t hpa,
unsigned long page_size,
bool page_rdonly, bool page_exec)
{
int ret;
u32 level = 0;
pte_t new_pte;
pgprot_t prot;
ret = stage2_page_size_to_level(page_size, &level);
if (ret)
return ret;
/*
* A RISC-V implementation can choose to either:
* 1) Update 'A' and 'D' PTE bits in hardware
* 2) Generate page fault when 'A' and/or 'D' bits are not set
* PTE so that software can update these bits.
*
* We support both options mentioned above. To achieve this, we
* always set 'A' and 'D' PTE bits at time of creating stage2
* mapping. To support KVM dirty page logging with both options
* mentioned above, we will write-protect stage2 PTEs to track
* dirty pages.
*/
if (page_exec) {
if (page_rdonly)
prot = PAGE_READ_EXEC;
else
prot = PAGE_WRITE_EXEC;
} else {
if (page_rdonly)
prot = PAGE_READ;
else
prot = PAGE_WRITE;
}
new_pte = pfn_pte(PFN_DOWN(hpa), prot);
new_pte = pte_mkdirty(new_pte);
return stage2_set_pte(kvm, level, pcache, gpa, &new_pte);
}
enum stage2_op {
STAGE2_OP_NOP = 0, /* Nothing */
STAGE2_OP_CLEAR, /* Clear/Unmap */
STAGE2_OP_WP, /* Write-protect */
};
static void stage2_op_pte(struct kvm *kvm, gpa_t addr,
pte_t *ptep, u32 ptep_level, enum stage2_op op)
{
int i, ret;
pte_t *next_ptep;
u32 next_ptep_level;
unsigned long next_page_size, page_size;
ret = stage2_level_to_page_size(ptep_level, &page_size);
if (ret)
return;
BUG_ON(addr & (page_size - 1));
if (!pte_val(*ptep))
return;
if (ptep_level && !stage2_pte_leaf(ptep)) {
next_ptep = (pte_t *)stage2_pte_page_vaddr(*ptep);
next_ptep_level = ptep_level - 1;
ret = stage2_level_to_page_size(next_ptep_level,
&next_page_size);
if (ret)
return;
if (op == STAGE2_OP_CLEAR)
set_pte(ptep, __pte(0));
for (i = 0; i < PTRS_PER_PTE; i++)
stage2_op_pte(kvm, addr + i * next_page_size,
&next_ptep[i], next_ptep_level, op);
if (op == STAGE2_OP_CLEAR)
put_page(virt_to_page(next_ptep));
} else {
if (op == STAGE2_OP_CLEAR)
set_pte(ptep, __pte(0));
else if (op == STAGE2_OP_WP)
set_pte(ptep, __pte(pte_val(*ptep) & ~_PAGE_WRITE));
stage2_remote_tlb_flush(kvm, ptep_level, addr);
}
}
static void stage2_unmap_range(struct kvm *kvm, gpa_t start,
gpa_t size, bool may_block)
{
int ret;
pte_t *ptep;
u32 ptep_level;
bool found_leaf;
unsigned long page_size;
gpa_t addr = start, end = start + size;
while (addr < end) {
found_leaf = stage2_get_leaf_entry(kvm, addr,
&ptep, &ptep_level);
ret = stage2_level_to_page_size(ptep_level, &page_size);
if (ret)
break;
if (!found_leaf)
goto next;
if (!(addr & (page_size - 1)) && ((end - addr) >= page_size))
stage2_op_pte(kvm, addr, ptep,
ptep_level, STAGE2_OP_CLEAR);
next:
addr += page_size;
/*
* If the range is too large, release the kvm->mmu_lock
* to prevent starvation and lockup detector warnings.
*/
if (may_block && addr < end)
cond_resched_lock(&kvm->mmu_lock);
}
}
static void stage2_wp_range(struct kvm *kvm, gpa_t start, gpa_t end)
{
int ret;
pte_t *ptep;
u32 ptep_level;
bool found_leaf;
gpa_t addr = start;
unsigned long page_size;
while (addr < end) {
found_leaf = stage2_get_leaf_entry(kvm, addr,
&ptep, &ptep_level);
ret = stage2_level_to_page_size(ptep_level, &page_size);
if (ret)
break;
if (!found_leaf)
goto next;
if (!(addr & (page_size - 1)) && ((end - addr) >= page_size))
stage2_op_pte(kvm, addr, ptep,
ptep_level, STAGE2_OP_WP);
next:
addr += page_size;
}
}
static void stage2_wp_memory_region(struct kvm *kvm, int slot)
{
struct kvm_memslots *slots = kvm_memslots(kvm);
struct kvm_memory_slot *memslot = id_to_memslot(slots, slot);
phys_addr_t start = memslot->base_gfn << PAGE_SHIFT;
phys_addr_t end = (memslot->base_gfn + memslot->npages) << PAGE_SHIFT;
spin_lock(&kvm->mmu_lock);
stage2_wp_range(kvm, start, end);
spin_unlock(&kvm->mmu_lock);
kvm_flush_remote_tlbs(kvm);
}
static int stage2_ioremap(struct kvm *kvm, gpa_t gpa, phys_addr_t hpa,
unsigned long size, bool writable)
{
pte_t pte;
int ret = 0;
unsigned long pfn;
phys_addr_t addr, end;
struct kvm_mmu_page_cache pcache = { 0, };
end = (gpa + size + PAGE_SIZE - 1) & PAGE_MASK;
pfn = __phys_to_pfn(hpa);
for (addr = gpa; addr < end; addr += PAGE_SIZE) {
pte = pfn_pte(pfn, PAGE_KERNEL);
if (!writable)
pte = pte_wrprotect(pte);
ret = stage2_cache_topup(&pcache,
stage2_pgd_levels,
KVM_MMU_PAGE_CACHE_NR_OBJS);
if (ret)
goto out;
spin_lock(&kvm->mmu_lock);
ret = stage2_set_pte(kvm, 0, &pcache, addr, &pte);
spin_unlock(&kvm->mmu_lock);
if (ret)
goto out;
pfn++;
}
out:
stage2_cache_flush(&pcache);
return ret;
}
void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
struct kvm_memory_slot *slot,
gfn_t gfn_offset,
unsigned long mask)
{
phys_addr_t base_gfn = slot->base_gfn + gfn_offset;
phys_addr_t start = (base_gfn + __ffs(mask)) << PAGE_SHIFT;
phys_addr_t end = (base_gfn + __fls(mask) + 1) << PAGE_SHIFT;
stage2_wp_range(kvm, start, end);
}
void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot)
{
}
void kvm_arch_flush_remote_tlbs_memslot(struct kvm *kvm,
const struct kvm_memory_slot *memslot)
{
kvm_flush_remote_tlbs(kvm);
}
void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free)
{
}
void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen)
{
}
void kvm_arch_flush_shadow_all(struct kvm *kvm)
{
kvm_riscv_stage2_free_pgd(kvm);
}
void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
struct kvm_memory_slot *slot)
{
}
void kvm_arch_commit_memory_region(struct kvm *kvm,
const struct kvm_userspace_memory_region *mem,
struct kvm_memory_slot *old,
const struct kvm_memory_slot *new,
enum kvm_mr_change change)
{
/*
* At this point memslot has been committed and there is an
* allocated dirty_bitmap[], dirty pages will be tracked while
* the memory slot is write protected.
*/
if (change != KVM_MR_DELETE && mem->flags & KVM_MEM_LOG_DIRTY_PAGES)
stage2_wp_memory_region(kvm, mem->slot);
}
int kvm_arch_prepare_memory_region(struct kvm *kvm,
struct kvm_memory_slot *memslot,
const struct kvm_userspace_memory_region *mem,
enum kvm_mr_change change)
{
hva_t hva = mem->userspace_addr;
hva_t reg_end = hva + mem->memory_size;
bool writable = !(mem->flags & KVM_MEM_READONLY);
int ret = 0;
if (change != KVM_MR_CREATE && change != KVM_MR_MOVE &&
change != KVM_MR_FLAGS_ONLY)
return 0;
/*
* Prevent userspace from creating a memory region outside of the GPA
* space addressable by the KVM guest GPA space.
*/
if ((memslot->base_gfn + memslot->npages) >=
(stage2_gpa_size >> PAGE_SHIFT))
return -EFAULT;
mmap_read_lock(current->mm);
/*
* A memory region could potentially cover multiple VMAs, and
* any holes between them, so iterate over all of them to find
* out if we can map any of them right now.
*
* +--------------------------------------------+
* +---------------+----------------+ +----------------+
* | : VMA 1 | VMA 2 | | VMA 3 : |
* +---------------+----------------+ +----------------+
* | memory region |
* +--------------------------------------------+
*/
do {
struct vm_area_struct *vma = find_vma(current->mm, hva);
hva_t vm_start, vm_end;
if (!vma || vma->vm_start >= reg_end)
break;
/*
* Mapping a read-only VMA is only allowed if the
* memory region is configured as read-only.
*/
if (writable && !(vma->vm_flags & VM_WRITE)) {
ret = -EPERM;
break;
}
/* Take the intersection of this VMA with the memory region */
vm_start = max(hva, vma->vm_start);
vm_end = min(reg_end, vma->vm_end);
if (vma->vm_flags & VM_PFNMAP) {
gpa_t gpa = mem->guest_phys_addr +
(vm_start - mem->userspace_addr);
phys_addr_t pa;
pa = (phys_addr_t)vma->vm_pgoff << PAGE_SHIFT;
pa += vm_start - vma->vm_start;
/* IO region dirty page logging not allowed */
if (memslot->flags & KVM_MEM_LOG_DIRTY_PAGES) {
ret = -EINVAL;
goto out;
}
ret = stage2_ioremap(kvm, gpa, pa,
vm_end - vm_start, writable);
if (ret)
break;
}
hva = vm_end;
} while (hva < reg_end);
if (change == KVM_MR_FLAGS_ONLY)
goto out;
spin_lock(&kvm->mmu_lock);
if (ret)
stage2_unmap_range(kvm, mem->guest_phys_addr,
mem->memory_size, false);
spin_unlock(&kvm->mmu_lock);
out:
mmap_read_unlock(current->mm);
return ret;
}
bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range)
{
if (!kvm->arch.pgd)
return 0;
stage2_unmap_range(kvm, range->start << PAGE_SHIFT,
(range->end - range->start) << PAGE_SHIFT,
range->may_block);
return 0;
}
bool kvm_set_spte_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
{
int ret;
kvm_pfn_t pfn = pte_pfn(range->pte);
if (!kvm->arch.pgd)
return 0;
WARN_ON(range->end - range->start != 1);
ret = stage2_map_page(kvm, NULL, range->start << PAGE_SHIFT,
__pfn_to_phys(pfn), PAGE_SIZE, true, true);
if (ret) {
kvm_debug("Failed to map stage2 page (error %d)\n", ret);
return 1;
}
return 0;
}
bool kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
{
pte_t *ptep;
u32 ptep_level = 0;
u64 size = (range->end - range->start) << PAGE_SHIFT;
if (!kvm->arch.pgd)
return 0;
WARN_ON(size != PAGE_SIZE && size != PMD_SIZE && size != PGDIR_SIZE);
if (!stage2_get_leaf_entry(kvm, range->start << PAGE_SHIFT,
&ptep, &ptep_level))
return 0;
return ptep_test_and_clear_young(NULL, 0, ptep);
}
bool kvm_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
{
pte_t *ptep;
u32 ptep_level = 0;
u64 size = (range->end - range->start) << PAGE_SHIFT;
if (!kvm->arch.pgd)
return 0;
WARN_ON(size != PAGE_SIZE && size != PMD_SIZE && size != PGDIR_SIZE);
if (!stage2_get_leaf_entry(kvm, range->start << PAGE_SHIFT,
&ptep, &ptep_level))
return 0;
return pte_young(*ptep);
}
int kvm_riscv_stage2_map(struct kvm_vcpu *vcpu,
struct kvm_memory_slot *memslot,
gpa_t gpa, unsigned long hva, bool is_write)
{
int ret;
kvm_pfn_t hfn;
bool writeable;
short vma_pageshift;
gfn_t gfn = gpa >> PAGE_SHIFT;
struct vm_area_struct *vma;
struct kvm *kvm = vcpu->kvm;
struct kvm_mmu_page_cache *pcache = &vcpu->arch.mmu_page_cache;
bool logging = (memslot->dirty_bitmap &&
!(memslot->flags & KVM_MEM_READONLY)) ? true : false;
unsigned long vma_pagesize, mmu_seq;
mmap_read_lock(current->mm);
vma = find_vma_intersection(current->mm, hva, hva + 1);
if (unlikely(!vma)) {
kvm_err("Failed to find VMA for hva 0x%lx\n", hva);
mmap_read_unlock(current->mm);
return -EFAULT;
}
if (is_vm_hugetlb_page(vma))
vma_pageshift = huge_page_shift(hstate_vma(vma));
else
vma_pageshift = PAGE_SHIFT;
vma_pagesize = 1ULL << vma_pageshift;
if (logging || (vma->vm_flags & VM_PFNMAP))
vma_pagesize = PAGE_SIZE;
if (vma_pagesize == PMD_SIZE || vma_pagesize == PGDIR_SIZE)
gfn = (gpa & huge_page_mask(hstate_vma(vma))) >> PAGE_SHIFT;
mmap_read_unlock(current->mm);
if (vma_pagesize != PGDIR_SIZE &&
vma_pagesize != PMD_SIZE &&
vma_pagesize != PAGE_SIZE) {
kvm_err("Invalid VMA page size 0x%lx\n", vma_pagesize);
return -EFAULT;
}
/* We need minimum second+third level pages */
ret = stage2_cache_topup(pcache, stage2_pgd_levels,
KVM_MMU_PAGE_CACHE_NR_OBJS);
if (ret) {
kvm_err("Failed to topup stage2 cache\n");
return ret;
}
mmu_seq = kvm->mmu_notifier_seq;
hfn = gfn_to_pfn_prot(kvm, gfn, is_write, &writeable);
if (hfn == KVM_PFN_ERR_HWPOISON) {
send_sig_mceerr(BUS_MCEERR_AR, (void __user *)hva,
vma_pageshift, current);
return 0;
}
if (is_error_noslot_pfn(hfn))
return -EFAULT;
/*
* If logging is active then we allow writable pages only
* for write faults.
*/
if (logging && !is_write)
writeable = false;
spin_lock(&kvm->mmu_lock);
if (mmu_notifier_retry(kvm, mmu_seq))
goto out_unlock;
if (writeable) {
kvm_set_pfn_dirty(hfn);
mark_page_dirty(kvm, gfn);
ret = stage2_map_page(kvm, pcache, gpa, hfn << PAGE_SHIFT,
vma_pagesize, false, true);
} else {
ret = stage2_map_page(kvm, pcache, gpa, hfn << PAGE_SHIFT,
vma_pagesize, true, true);
}
if (ret)
kvm_err("Failed to map in stage2\n");
out_unlock:
spin_unlock(&kvm->mmu_lock);
kvm_set_pfn_accessed(hfn);
kvm_release_pfn_clean(hfn);
return ret;
}
void kvm_riscv_stage2_flush_cache(struct kvm_vcpu *vcpu)
{
stage2_cache_flush(&vcpu->arch.mmu_page_cache);
}
int kvm_riscv_stage2_alloc_pgd(struct kvm *kvm)
{
struct page *pgd_page;
if (kvm->arch.pgd != NULL) {
kvm_err("kvm_arch already initialized?\n");
return -EINVAL;
}
pgd_page = alloc_pages(GFP_KERNEL | __GFP_ZERO,
get_order(stage2_pgd_size));
if (!pgd_page)
return -ENOMEM;
kvm->arch.pgd = page_to_virt(pgd_page);
kvm->arch.pgd_phys = page_to_phys(pgd_page);
return 0;
}
void kvm_riscv_stage2_free_pgd(struct kvm *kvm)
{
void *pgd = NULL;
spin_lock(&kvm->mmu_lock);
if (kvm->arch.pgd) {
stage2_unmap_range(kvm, 0UL, stage2_gpa_size, false);
pgd = READ_ONCE(kvm->arch.pgd);
kvm->arch.pgd = NULL;
kvm->arch.pgd_phys = 0;
}
spin_unlock(&kvm->mmu_lock);
if (pgd)
free_pages((unsigned long)pgd, get_order(stage2_pgd_size));
}
void kvm_riscv_stage2_update_hgatp(struct kvm_vcpu *vcpu)
{
unsigned long hgatp = stage2_mode;
struct kvm_arch *k = &vcpu->kvm->arch;
hgatp |= (READ_ONCE(k->vmid.vmid) << HGATP_VMID_SHIFT) &
HGATP_VMID_MASK;
hgatp |= (k->pgd_phys >> PAGE_SHIFT) & HGATP_PPN;
csr_write(CSR_HGATP, hgatp);
if (!kvm_riscv_stage2_vmid_bits())
__kvm_riscv_hfence_gvma_all();
}
void kvm_riscv_stage2_mode_detect(void)
{
#ifdef CONFIG_64BIT
/* Try Sv48x4 stage2 mode */
csr_write(CSR_HGATP, HGATP_MODE_SV48X4 << HGATP_MODE_SHIFT);
if ((csr_read(CSR_HGATP) >> HGATP_MODE_SHIFT) == HGATP_MODE_SV48X4) {
stage2_mode = (HGATP_MODE_SV48X4 << HGATP_MODE_SHIFT);
stage2_pgd_levels = 4;
}
csr_write(CSR_HGATP, 0);
__kvm_riscv_hfence_gvma_all();
#endif
}
unsigned long kvm_riscv_stage2_mode(void)
{
return stage2_mode >> HGATP_MODE_SHIFT;
}

74
arch/riscv/kvm/tlb.S Normal file
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@ -0,0 +1,74 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#include <linux/linkage.h>
#include <asm/asm.h>
.text
.altmacro
.option norelax
/*
* Instruction encoding of hfence.gvma is:
* HFENCE.GVMA rs1, rs2
* HFENCE.GVMA zero, rs2
* HFENCE.GVMA rs1
* HFENCE.GVMA
*
* rs1!=zero and rs2!=zero ==> HFENCE.GVMA rs1, rs2
* rs1==zero and rs2!=zero ==> HFENCE.GVMA zero, rs2
* rs1!=zero and rs2==zero ==> HFENCE.GVMA rs1
* rs1==zero and rs2==zero ==> HFENCE.GVMA
*
* Instruction encoding of HFENCE.GVMA is:
* 0110001 rs2(5) rs1(5) 000 00000 1110011
*/
ENTRY(__kvm_riscv_hfence_gvma_vmid_gpa)
/*
* rs1 = a0 (GPA)
* rs2 = a1 (VMID)
* HFENCE.GVMA a0, a1
* 0110001 01011 01010 000 00000 1110011
*/
.word 0x62b50073
ret
ENDPROC(__kvm_riscv_hfence_gvma_vmid_gpa)
ENTRY(__kvm_riscv_hfence_gvma_vmid)
/*
* rs1 = zero
* rs2 = a0 (VMID)
* HFENCE.GVMA zero, a0
* 0110001 01010 00000 000 00000 1110011
*/
.word 0x62a00073
ret
ENDPROC(__kvm_riscv_hfence_gvma_vmid)
ENTRY(__kvm_riscv_hfence_gvma_gpa)
/*
* rs1 = a0 (GPA)
* rs2 = zero
* HFENCE.GVMA a0
* 0110001 00000 01010 000 00000 1110011
*/
.word 0x62050073
ret
ENDPROC(__kvm_riscv_hfence_gvma_gpa)
ENTRY(__kvm_riscv_hfence_gvma_all)
/*
* rs1 = zero
* rs2 = zero
* HFENCE.GVMA
* 0110001 00000 00000 000 00000 1110011
*/
.word 0x62000073
ret
ENDPROC(__kvm_riscv_hfence_gvma_all)

997
arch/riscv/kvm/vcpu.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#include <linux/bitops.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/kdebug.h>
#include <linux/module.h>
#include <linux/percpu.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/sched/signal.h>
#include <linux/fs.h>
#include <linux/kvm_host.h>
#include <asm/csr.h>
#include <asm/hwcap.h>
const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
KVM_GENERIC_VCPU_STATS(),
STATS_DESC_COUNTER(VCPU, ecall_exit_stat),
STATS_DESC_COUNTER(VCPU, wfi_exit_stat),
STATS_DESC_COUNTER(VCPU, mmio_exit_user),
STATS_DESC_COUNTER(VCPU, mmio_exit_kernel),
STATS_DESC_COUNTER(VCPU, exits)
};
const struct kvm_stats_header kvm_vcpu_stats_header = {
.name_size = KVM_STATS_NAME_SIZE,
.num_desc = ARRAY_SIZE(kvm_vcpu_stats_desc),
.id_offset = sizeof(struct kvm_stats_header),
.desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
.data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
sizeof(kvm_vcpu_stats_desc),
};
#ifdef CONFIG_FPU
static void kvm_riscv_vcpu_fp_reset(struct kvm_vcpu *vcpu)
{
unsigned long isa = vcpu->arch.isa;
struct kvm_cpu_context *cntx = &vcpu->arch.guest_context;
cntx->sstatus &= ~SR_FS;
if (riscv_isa_extension_available(&isa, f) ||
riscv_isa_extension_available(&isa, d))
cntx->sstatus |= SR_FS_INITIAL;
else
cntx->sstatus |= SR_FS_OFF;
}
static void kvm_riscv_vcpu_fp_clean(struct kvm_cpu_context *cntx)
{
cntx->sstatus &= ~SR_FS;
cntx->sstatus |= SR_FS_CLEAN;
}
static void kvm_riscv_vcpu_guest_fp_save(struct kvm_cpu_context *cntx,
unsigned long isa)
{
if ((cntx->sstatus & SR_FS) == SR_FS_DIRTY) {
if (riscv_isa_extension_available(&isa, d))
__kvm_riscv_fp_d_save(cntx);
else if (riscv_isa_extension_available(&isa, f))
__kvm_riscv_fp_f_save(cntx);
kvm_riscv_vcpu_fp_clean(cntx);
}
}
static void kvm_riscv_vcpu_guest_fp_restore(struct kvm_cpu_context *cntx,
unsigned long isa)
{
if ((cntx->sstatus & SR_FS) != SR_FS_OFF) {
if (riscv_isa_extension_available(&isa, d))
__kvm_riscv_fp_d_restore(cntx);
else if (riscv_isa_extension_available(&isa, f))
__kvm_riscv_fp_f_restore(cntx);
kvm_riscv_vcpu_fp_clean(cntx);
}
}
static void kvm_riscv_vcpu_host_fp_save(struct kvm_cpu_context *cntx)
{
/* No need to check host sstatus as it can be modified outside */
if (riscv_isa_extension_available(NULL, d))
__kvm_riscv_fp_d_save(cntx);
else if (riscv_isa_extension_available(NULL, f))
__kvm_riscv_fp_f_save(cntx);
}
static void kvm_riscv_vcpu_host_fp_restore(struct kvm_cpu_context *cntx)
{
if (riscv_isa_extension_available(NULL, d))
__kvm_riscv_fp_d_restore(cntx);
else if (riscv_isa_extension_available(NULL, f))
__kvm_riscv_fp_f_restore(cntx);
}
#else
static void kvm_riscv_vcpu_fp_reset(struct kvm_vcpu *vcpu)
{
}
static void kvm_riscv_vcpu_guest_fp_save(struct kvm_cpu_context *cntx,
unsigned long isa)
{
}
static void kvm_riscv_vcpu_guest_fp_restore(struct kvm_cpu_context *cntx,
unsigned long isa)
{
}
static void kvm_riscv_vcpu_host_fp_save(struct kvm_cpu_context *cntx)
{
}
static void kvm_riscv_vcpu_host_fp_restore(struct kvm_cpu_context *cntx)
{
}
#endif
#define KVM_RISCV_ISA_ALLOWED (riscv_isa_extension_mask(a) | \
riscv_isa_extension_mask(c) | \
riscv_isa_extension_mask(d) | \
riscv_isa_extension_mask(f) | \
riscv_isa_extension_mask(i) | \
riscv_isa_extension_mask(m) | \
riscv_isa_extension_mask(s) | \
riscv_isa_extension_mask(u))
static void kvm_riscv_reset_vcpu(struct kvm_vcpu *vcpu)
{
struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
struct kvm_vcpu_csr *reset_csr = &vcpu->arch.guest_reset_csr;
struct kvm_cpu_context *cntx = &vcpu->arch.guest_context;
struct kvm_cpu_context *reset_cntx = &vcpu->arch.guest_reset_context;
memcpy(csr, reset_csr, sizeof(*csr));
memcpy(cntx, reset_cntx, sizeof(*cntx));
kvm_riscv_vcpu_fp_reset(vcpu);
kvm_riscv_vcpu_timer_reset(vcpu);
WRITE_ONCE(vcpu->arch.irqs_pending, 0);
WRITE_ONCE(vcpu->arch.irqs_pending_mask, 0);
}
int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
{
return 0;
}
int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
{
struct kvm_cpu_context *cntx;
/* Mark this VCPU never ran */
vcpu->arch.ran_atleast_once = false;
/* Setup ISA features available to VCPU */
vcpu->arch.isa = riscv_isa_extension_base(NULL) & KVM_RISCV_ISA_ALLOWED;
/* Setup reset state of shadow SSTATUS and HSTATUS CSRs */
cntx = &vcpu->arch.guest_reset_context;
cntx->sstatus = SR_SPP | SR_SPIE;
cntx->hstatus = 0;
cntx->hstatus |= HSTATUS_VTW;
cntx->hstatus |= HSTATUS_SPVP;
cntx->hstatus |= HSTATUS_SPV;
/* Setup VCPU timer */
kvm_riscv_vcpu_timer_init(vcpu);
/* Reset VCPU */
kvm_riscv_reset_vcpu(vcpu);
return 0;
}
void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
{
}
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
/* Cleanup VCPU timer */
kvm_riscv_vcpu_timer_deinit(vcpu);
/* Flush the pages pre-allocated for Stage2 page table mappings */
kvm_riscv_stage2_flush_cache(vcpu);
}
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
return kvm_riscv_vcpu_has_interrupts(vcpu, 1UL << IRQ_VS_TIMER);
}
void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
{
}
void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
{
}
int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
{
return (kvm_riscv_vcpu_has_interrupts(vcpu, -1UL) &&
!vcpu->arch.power_off && !vcpu->arch.pause);
}
int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
{
return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
}
bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
{
return (vcpu->arch.guest_context.sstatus & SR_SPP) ? true : false;
}
vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
{
return VM_FAULT_SIGBUS;
}
static int kvm_riscv_vcpu_get_reg_config(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg)
{
unsigned long __user *uaddr =
(unsigned long __user *)(unsigned long)reg->addr;
unsigned long reg_num = reg->id & ~(KVM_REG_ARCH_MASK |
KVM_REG_SIZE_MASK |
KVM_REG_RISCV_CONFIG);
unsigned long reg_val;
if (KVM_REG_SIZE(reg->id) != sizeof(unsigned long))
return -EINVAL;
switch (reg_num) {
case KVM_REG_RISCV_CONFIG_REG(isa):
reg_val = vcpu->arch.isa;
break;
default:
return -EINVAL;
};
if (copy_to_user(uaddr, &reg_val, KVM_REG_SIZE(reg->id)))
return -EFAULT;
return 0;
}
static int kvm_riscv_vcpu_set_reg_config(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg)
{
unsigned long __user *uaddr =
(unsigned long __user *)(unsigned long)reg->addr;
unsigned long reg_num = reg->id & ~(KVM_REG_ARCH_MASK |
KVM_REG_SIZE_MASK |
KVM_REG_RISCV_CONFIG);
unsigned long reg_val;
if (KVM_REG_SIZE(reg->id) != sizeof(unsigned long))
return -EINVAL;
if (copy_from_user(&reg_val, uaddr, KVM_REG_SIZE(reg->id)))
return -EFAULT;
switch (reg_num) {
case KVM_REG_RISCV_CONFIG_REG(isa):
if (!vcpu->arch.ran_atleast_once) {
vcpu->arch.isa = reg_val;
vcpu->arch.isa &= riscv_isa_extension_base(NULL);
vcpu->arch.isa &= KVM_RISCV_ISA_ALLOWED;
kvm_riscv_vcpu_fp_reset(vcpu);
} else {
return -EOPNOTSUPP;
}
break;
default:
return -EINVAL;
};
return 0;
}
static int kvm_riscv_vcpu_get_reg_core(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg)
{
struct kvm_cpu_context *cntx = &vcpu->arch.guest_context;
unsigned long __user *uaddr =
(unsigned long __user *)(unsigned long)reg->addr;
unsigned long reg_num = reg->id & ~(KVM_REG_ARCH_MASK |
KVM_REG_SIZE_MASK |
KVM_REG_RISCV_CORE);
unsigned long reg_val;
if (KVM_REG_SIZE(reg->id) != sizeof(unsigned long))
return -EINVAL;
if (reg_num >= sizeof(struct kvm_riscv_core) / sizeof(unsigned long))
return -EINVAL;
if (reg_num == KVM_REG_RISCV_CORE_REG(regs.pc))
reg_val = cntx->sepc;
else if (KVM_REG_RISCV_CORE_REG(regs.pc) < reg_num &&
reg_num <= KVM_REG_RISCV_CORE_REG(regs.t6))
reg_val = ((unsigned long *)cntx)[reg_num];
else if (reg_num == KVM_REG_RISCV_CORE_REG(mode))
reg_val = (cntx->sstatus & SR_SPP) ?
KVM_RISCV_MODE_S : KVM_RISCV_MODE_U;
else
return -EINVAL;
if (copy_to_user(uaddr, &reg_val, KVM_REG_SIZE(reg->id)))
return -EFAULT;
return 0;
}
static int kvm_riscv_vcpu_set_reg_core(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg)
{
struct kvm_cpu_context *cntx = &vcpu->arch.guest_context;
unsigned long __user *uaddr =
(unsigned long __user *)(unsigned long)reg->addr;
unsigned long reg_num = reg->id & ~(KVM_REG_ARCH_MASK |
KVM_REG_SIZE_MASK |
KVM_REG_RISCV_CORE);
unsigned long reg_val;
if (KVM_REG_SIZE(reg->id) != sizeof(unsigned long))
return -EINVAL;
if (reg_num >= sizeof(struct kvm_riscv_core) / sizeof(unsigned long))
return -EINVAL;
if (copy_from_user(&reg_val, uaddr, KVM_REG_SIZE(reg->id)))
return -EFAULT;
if (reg_num == KVM_REG_RISCV_CORE_REG(regs.pc))
cntx->sepc = reg_val;
else if (KVM_REG_RISCV_CORE_REG(regs.pc) < reg_num &&
reg_num <= KVM_REG_RISCV_CORE_REG(regs.t6))
((unsigned long *)cntx)[reg_num] = reg_val;
else if (reg_num == KVM_REG_RISCV_CORE_REG(mode)) {
if (reg_val == KVM_RISCV_MODE_S)
cntx->sstatus |= SR_SPP;
else
cntx->sstatus &= ~SR_SPP;
} else
return -EINVAL;
return 0;
}
static int kvm_riscv_vcpu_get_reg_csr(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg)
{
struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
unsigned long __user *uaddr =
(unsigned long __user *)(unsigned long)reg->addr;
unsigned long reg_num = reg->id & ~(KVM_REG_ARCH_MASK |
KVM_REG_SIZE_MASK |
KVM_REG_RISCV_CSR);
unsigned long reg_val;
if (KVM_REG_SIZE(reg->id) != sizeof(unsigned long))
return -EINVAL;
if (reg_num >= sizeof(struct kvm_riscv_csr) / sizeof(unsigned long))
return -EINVAL;
if (reg_num == KVM_REG_RISCV_CSR_REG(sip)) {
kvm_riscv_vcpu_flush_interrupts(vcpu);
reg_val = (csr->hvip >> VSIP_TO_HVIP_SHIFT) & VSIP_VALID_MASK;
} else
reg_val = ((unsigned long *)csr)[reg_num];
if (copy_to_user(uaddr, &reg_val, KVM_REG_SIZE(reg->id)))
return -EFAULT;
return 0;
}
static int kvm_riscv_vcpu_set_reg_csr(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg)
{
struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
unsigned long __user *uaddr =
(unsigned long __user *)(unsigned long)reg->addr;
unsigned long reg_num = reg->id & ~(KVM_REG_ARCH_MASK |
KVM_REG_SIZE_MASK |
KVM_REG_RISCV_CSR);
unsigned long reg_val;
if (KVM_REG_SIZE(reg->id) != sizeof(unsigned long))
return -EINVAL;
if (reg_num >= sizeof(struct kvm_riscv_csr) / sizeof(unsigned long))
return -EINVAL;
if (copy_from_user(&reg_val, uaddr, KVM_REG_SIZE(reg->id)))
return -EFAULT;
if (reg_num == KVM_REG_RISCV_CSR_REG(sip)) {
reg_val &= VSIP_VALID_MASK;
reg_val <<= VSIP_TO_HVIP_SHIFT;
}
((unsigned long *)csr)[reg_num] = reg_val;
if (reg_num == KVM_REG_RISCV_CSR_REG(sip))
WRITE_ONCE(vcpu->arch.irqs_pending_mask, 0);
return 0;
}
static int kvm_riscv_vcpu_get_reg_fp(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg,
unsigned long rtype)
{
struct kvm_cpu_context *cntx = &vcpu->arch.guest_context;
unsigned long isa = vcpu->arch.isa;
unsigned long __user *uaddr =
(unsigned long __user *)(unsigned long)reg->addr;
unsigned long reg_num = reg->id & ~(KVM_REG_ARCH_MASK |
KVM_REG_SIZE_MASK |
rtype);
void *reg_val;
if ((rtype == KVM_REG_RISCV_FP_F) &&
riscv_isa_extension_available(&isa, f)) {
if (KVM_REG_SIZE(reg->id) != sizeof(u32))
return -EINVAL;
if (reg_num == KVM_REG_RISCV_FP_F_REG(fcsr))
reg_val = &cntx->fp.f.fcsr;
else if ((KVM_REG_RISCV_FP_F_REG(f[0]) <= reg_num) &&
reg_num <= KVM_REG_RISCV_FP_F_REG(f[31]))
reg_val = &cntx->fp.f.f[reg_num];
else
return -EINVAL;
} else if ((rtype == KVM_REG_RISCV_FP_D) &&
riscv_isa_extension_available(&isa, d)) {
if (reg_num == KVM_REG_RISCV_FP_D_REG(fcsr)) {
if (KVM_REG_SIZE(reg->id) != sizeof(u32))
return -EINVAL;
reg_val = &cntx->fp.d.fcsr;
} else if ((KVM_REG_RISCV_FP_D_REG(f[0]) <= reg_num) &&
reg_num <= KVM_REG_RISCV_FP_D_REG(f[31])) {
if (KVM_REG_SIZE(reg->id) != sizeof(u64))
return -EINVAL;
reg_val = &cntx->fp.d.f[reg_num];
} else
return -EINVAL;
} else
return -EINVAL;
if (copy_to_user(uaddr, reg_val, KVM_REG_SIZE(reg->id)))
return -EFAULT;
return 0;
}
static int kvm_riscv_vcpu_set_reg_fp(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg,
unsigned long rtype)
{
struct kvm_cpu_context *cntx = &vcpu->arch.guest_context;
unsigned long isa = vcpu->arch.isa;
unsigned long __user *uaddr =
(unsigned long __user *)(unsigned long)reg->addr;
unsigned long reg_num = reg->id & ~(KVM_REG_ARCH_MASK |
KVM_REG_SIZE_MASK |
rtype);
void *reg_val;
if ((rtype == KVM_REG_RISCV_FP_F) &&
riscv_isa_extension_available(&isa, f)) {
if (KVM_REG_SIZE(reg->id) != sizeof(u32))
return -EINVAL;
if (reg_num == KVM_REG_RISCV_FP_F_REG(fcsr))
reg_val = &cntx->fp.f.fcsr;
else if ((KVM_REG_RISCV_FP_F_REG(f[0]) <= reg_num) &&
reg_num <= KVM_REG_RISCV_FP_F_REG(f[31]))
reg_val = &cntx->fp.f.f[reg_num];
else
return -EINVAL;
} else if ((rtype == KVM_REG_RISCV_FP_D) &&
riscv_isa_extension_available(&isa, d)) {
if (reg_num == KVM_REG_RISCV_FP_D_REG(fcsr)) {
if (KVM_REG_SIZE(reg->id) != sizeof(u32))
return -EINVAL;
reg_val = &cntx->fp.d.fcsr;
} else if ((KVM_REG_RISCV_FP_D_REG(f[0]) <= reg_num) &&
reg_num <= KVM_REG_RISCV_FP_D_REG(f[31])) {
if (KVM_REG_SIZE(reg->id) != sizeof(u64))
return -EINVAL;
reg_val = &cntx->fp.d.f[reg_num];
} else
return -EINVAL;
} else
return -EINVAL;
if (copy_from_user(reg_val, uaddr, KVM_REG_SIZE(reg->id)))
return -EFAULT;
return 0;
}
static int kvm_riscv_vcpu_set_reg(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg)
{
if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_CONFIG)
return kvm_riscv_vcpu_set_reg_config(vcpu, reg);
else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_CORE)
return kvm_riscv_vcpu_set_reg_core(vcpu, reg);
else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_CSR)
return kvm_riscv_vcpu_set_reg_csr(vcpu, reg);
else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_TIMER)
return kvm_riscv_vcpu_set_reg_timer(vcpu, reg);
else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_FP_F)
return kvm_riscv_vcpu_set_reg_fp(vcpu, reg,
KVM_REG_RISCV_FP_F);
else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_FP_D)
return kvm_riscv_vcpu_set_reg_fp(vcpu, reg,
KVM_REG_RISCV_FP_D);
return -EINVAL;
}
static int kvm_riscv_vcpu_get_reg(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg)
{
if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_CONFIG)
return kvm_riscv_vcpu_get_reg_config(vcpu, reg);
else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_CORE)
return kvm_riscv_vcpu_get_reg_core(vcpu, reg);
else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_CSR)
return kvm_riscv_vcpu_get_reg_csr(vcpu, reg);
else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_TIMER)
return kvm_riscv_vcpu_get_reg_timer(vcpu, reg);
else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_FP_F)
return kvm_riscv_vcpu_get_reg_fp(vcpu, reg,
KVM_REG_RISCV_FP_F);
else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_FP_D)
return kvm_riscv_vcpu_get_reg_fp(vcpu, reg,
KVM_REG_RISCV_FP_D);
return -EINVAL;
}
long kvm_arch_vcpu_async_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
struct kvm_vcpu *vcpu = filp->private_data;
void __user *argp = (void __user *)arg;
if (ioctl == KVM_INTERRUPT) {
struct kvm_interrupt irq;
if (copy_from_user(&irq, argp, sizeof(irq)))
return -EFAULT;
if (irq.irq == KVM_INTERRUPT_SET)
return kvm_riscv_vcpu_set_interrupt(vcpu, IRQ_VS_EXT);
else
return kvm_riscv_vcpu_unset_interrupt(vcpu, IRQ_VS_EXT);
}
return -ENOIOCTLCMD;
}
long kvm_arch_vcpu_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
struct kvm_vcpu *vcpu = filp->private_data;
void __user *argp = (void __user *)arg;
long r = -EINVAL;
switch (ioctl) {
case KVM_SET_ONE_REG:
case KVM_GET_ONE_REG: {
struct kvm_one_reg reg;
r = -EFAULT;
if (copy_from_user(&reg, argp, sizeof(reg)))
break;
if (ioctl == KVM_SET_ONE_REG)
r = kvm_riscv_vcpu_set_reg(vcpu, &reg);
else
r = kvm_riscv_vcpu_get_reg(vcpu, &reg);
break;
}
default:
break;
}
return r;
}
int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
struct kvm_sregs *sregs)
{
return -EINVAL;
}
int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
struct kvm_sregs *sregs)
{
return -EINVAL;
}
int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
return -EINVAL;
}
int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
return -EINVAL;
}
int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
struct kvm_translation *tr)
{
return -EINVAL;
}
int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
return -EINVAL;
}
int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
return -EINVAL;
}
void kvm_riscv_vcpu_flush_interrupts(struct kvm_vcpu *vcpu)
{
struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
unsigned long mask, val;
if (READ_ONCE(vcpu->arch.irqs_pending_mask)) {
mask = xchg_acquire(&vcpu->arch.irqs_pending_mask, 0);
val = READ_ONCE(vcpu->arch.irqs_pending) & mask;
csr->hvip &= ~mask;
csr->hvip |= val;
}
}
void kvm_riscv_vcpu_sync_interrupts(struct kvm_vcpu *vcpu)
{
unsigned long hvip;
struct kvm_vcpu_arch *v = &vcpu->arch;
struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
/* Read current HVIP and VSIE CSRs */
csr->vsie = csr_read(CSR_VSIE);
/* Sync-up HVIP.VSSIP bit changes does by Guest */
hvip = csr_read(CSR_HVIP);
if ((csr->hvip ^ hvip) & (1UL << IRQ_VS_SOFT)) {
if (hvip & (1UL << IRQ_VS_SOFT)) {
if (!test_and_set_bit(IRQ_VS_SOFT,
&v->irqs_pending_mask))
set_bit(IRQ_VS_SOFT, &v->irqs_pending);
} else {
if (!test_and_set_bit(IRQ_VS_SOFT,
&v->irqs_pending_mask))
clear_bit(IRQ_VS_SOFT, &v->irqs_pending);
}
}
}
int kvm_riscv_vcpu_set_interrupt(struct kvm_vcpu *vcpu, unsigned int irq)
{
if (irq != IRQ_VS_SOFT &&
irq != IRQ_VS_TIMER &&
irq != IRQ_VS_EXT)
return -EINVAL;
set_bit(irq, &vcpu->arch.irqs_pending);
smp_mb__before_atomic();
set_bit(irq, &vcpu->arch.irqs_pending_mask);
kvm_vcpu_kick(vcpu);
return 0;
}
int kvm_riscv_vcpu_unset_interrupt(struct kvm_vcpu *vcpu, unsigned int irq)
{
if (irq != IRQ_VS_SOFT &&
irq != IRQ_VS_TIMER &&
irq != IRQ_VS_EXT)
return -EINVAL;
clear_bit(irq, &vcpu->arch.irqs_pending);
smp_mb__before_atomic();
set_bit(irq, &vcpu->arch.irqs_pending_mask);
return 0;
}
bool kvm_riscv_vcpu_has_interrupts(struct kvm_vcpu *vcpu, unsigned long mask)
{
unsigned long ie = ((vcpu->arch.guest_csr.vsie & VSIP_VALID_MASK)
<< VSIP_TO_HVIP_SHIFT) & mask;
return (READ_ONCE(vcpu->arch.irqs_pending) & ie) ? true : false;
}
void kvm_riscv_vcpu_power_off(struct kvm_vcpu *vcpu)
{
vcpu->arch.power_off = true;
kvm_make_request(KVM_REQ_SLEEP, vcpu);
kvm_vcpu_kick(vcpu);
}
void kvm_riscv_vcpu_power_on(struct kvm_vcpu *vcpu)
{
vcpu->arch.power_off = false;
kvm_vcpu_wake_up(vcpu);
}
int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
struct kvm_mp_state *mp_state)
{
if (vcpu->arch.power_off)
mp_state->mp_state = KVM_MP_STATE_STOPPED;
else
mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
return 0;
}
int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
struct kvm_mp_state *mp_state)
{
int ret = 0;
switch (mp_state->mp_state) {
case KVM_MP_STATE_RUNNABLE:
vcpu->arch.power_off = false;
break;
case KVM_MP_STATE_STOPPED:
kvm_riscv_vcpu_power_off(vcpu);
break;
default:
ret = -EINVAL;
}
return ret;
}
int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
struct kvm_guest_debug *dbg)
{
/* TODO; To be implemented later. */
return -EINVAL;
}
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
csr_write(CSR_VSSTATUS, csr->vsstatus);
csr_write(CSR_VSIE, csr->vsie);
csr_write(CSR_VSTVEC, csr->vstvec);
csr_write(CSR_VSSCRATCH, csr->vsscratch);
csr_write(CSR_VSEPC, csr->vsepc);
csr_write(CSR_VSCAUSE, csr->vscause);
csr_write(CSR_VSTVAL, csr->vstval);
csr_write(CSR_HVIP, csr->hvip);
csr_write(CSR_VSATP, csr->vsatp);
kvm_riscv_stage2_update_hgatp(vcpu);
kvm_riscv_vcpu_timer_restore(vcpu);
kvm_riscv_vcpu_host_fp_save(&vcpu->arch.host_context);
kvm_riscv_vcpu_guest_fp_restore(&vcpu->arch.guest_context,
vcpu->arch.isa);
vcpu->cpu = cpu;
}
void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
vcpu->cpu = -1;
kvm_riscv_vcpu_guest_fp_save(&vcpu->arch.guest_context,
vcpu->arch.isa);
kvm_riscv_vcpu_host_fp_restore(&vcpu->arch.host_context);
csr_write(CSR_HGATP, 0);
csr->vsstatus = csr_read(CSR_VSSTATUS);
csr->vsie = csr_read(CSR_VSIE);
csr->vstvec = csr_read(CSR_VSTVEC);
csr->vsscratch = csr_read(CSR_VSSCRATCH);
csr->vsepc = csr_read(CSR_VSEPC);
csr->vscause = csr_read(CSR_VSCAUSE);
csr->vstval = csr_read(CSR_VSTVAL);
csr->hvip = csr_read(CSR_HVIP);
csr->vsatp = csr_read(CSR_VSATP);
}
static void kvm_riscv_check_vcpu_requests(struct kvm_vcpu *vcpu)
{
struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu);
if (kvm_request_pending(vcpu)) {
if (kvm_check_request(KVM_REQ_SLEEP, vcpu)) {
rcuwait_wait_event(wait,
(!vcpu->arch.power_off) && (!vcpu->arch.pause),
TASK_INTERRUPTIBLE);
if (vcpu->arch.power_off || vcpu->arch.pause) {
/*
* Awaken to handle a signal, request to
* sleep again later.
*/
kvm_make_request(KVM_REQ_SLEEP, vcpu);
}
}
if (kvm_check_request(KVM_REQ_VCPU_RESET, vcpu))
kvm_riscv_reset_vcpu(vcpu);
if (kvm_check_request(KVM_REQ_UPDATE_HGATP, vcpu))
kvm_riscv_stage2_update_hgatp(vcpu);
if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
__kvm_riscv_hfence_gvma_all();
}
}
static void kvm_riscv_update_hvip(struct kvm_vcpu *vcpu)
{
struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
csr_write(CSR_HVIP, csr->hvip);
}
int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
{
int ret;
struct kvm_cpu_trap trap;
struct kvm_run *run = vcpu->run;
/* Mark this VCPU ran at least once */
vcpu->arch.ran_atleast_once = true;
vcpu->arch.srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
/* Process MMIO value returned from user-space */
if (run->exit_reason == KVM_EXIT_MMIO) {
ret = kvm_riscv_vcpu_mmio_return(vcpu, vcpu->run);
if (ret) {
srcu_read_unlock(&vcpu->kvm->srcu, vcpu->arch.srcu_idx);
return ret;
}
}
/* Process SBI value returned from user-space */
if (run->exit_reason == KVM_EXIT_RISCV_SBI) {
ret = kvm_riscv_vcpu_sbi_return(vcpu, vcpu->run);
if (ret) {
srcu_read_unlock(&vcpu->kvm->srcu, vcpu->arch.srcu_idx);
return ret;
}
}
if (run->immediate_exit) {
srcu_read_unlock(&vcpu->kvm->srcu, vcpu->arch.srcu_idx);
return -EINTR;
}
vcpu_load(vcpu);
kvm_sigset_activate(vcpu);
ret = 1;
run->exit_reason = KVM_EXIT_UNKNOWN;
while (ret > 0) {
/* Check conditions before entering the guest */
cond_resched();
kvm_riscv_stage2_vmid_update(vcpu);
kvm_riscv_check_vcpu_requests(vcpu);
preempt_disable();
local_irq_disable();
/*
* Exit if we have a signal pending so that we can deliver
* the signal to user space.
*/
if (signal_pending(current)) {
ret = -EINTR;
run->exit_reason = KVM_EXIT_INTR;
}
/*
* Ensure we set mode to IN_GUEST_MODE after we disable
* interrupts and before the final VCPU requests check.
* See the comment in kvm_vcpu_exiting_guest_mode() and
* Documentation/virtual/kvm/vcpu-requests.rst
*/
vcpu->mode = IN_GUEST_MODE;
srcu_read_unlock(&vcpu->kvm->srcu, vcpu->arch.srcu_idx);
smp_mb__after_srcu_read_unlock();
/*
* We might have got VCPU interrupts updated asynchronously
* so update it in HW.
*/
kvm_riscv_vcpu_flush_interrupts(vcpu);
/* Update HVIP CSR for current CPU */
kvm_riscv_update_hvip(vcpu);
if (ret <= 0 ||
kvm_riscv_stage2_vmid_ver_changed(&vcpu->kvm->arch.vmid) ||
kvm_request_pending(vcpu)) {
vcpu->mode = OUTSIDE_GUEST_MODE;
local_irq_enable();
preempt_enable();
vcpu->arch.srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
continue;
}
guest_enter_irqoff();
__kvm_riscv_switch_to(&vcpu->arch);
vcpu->mode = OUTSIDE_GUEST_MODE;
vcpu->stat.exits++;
/*
* Save SCAUSE, STVAL, HTVAL, and HTINST because we might
* get an interrupt between __kvm_riscv_switch_to() and
* local_irq_enable() which can potentially change CSRs.
*/
trap.sepc = vcpu->arch.guest_context.sepc;
trap.scause = csr_read(CSR_SCAUSE);
trap.stval = csr_read(CSR_STVAL);
trap.htval = csr_read(CSR_HTVAL);
trap.htinst = csr_read(CSR_HTINST);
/* Syncup interrupts state with HW */
kvm_riscv_vcpu_sync_interrupts(vcpu);
/*
* We may have taken a host interrupt in VS/VU-mode (i.e.
* while executing the guest). This interrupt is still
* pending, as we haven't serviced it yet!
*
* We're now back in HS-mode with interrupts disabled
* so enabling the interrupts now will have the effect
* of taking the interrupt again, in HS-mode this time.
*/
local_irq_enable();
/*
* We do local_irq_enable() before calling guest_exit() so
* that if a timer interrupt hits while running the guest
* we account that tick as being spent in the guest. We
* enable preemption after calling guest_exit() so that if
* we get preempted we make sure ticks after that is not
* counted as guest time.
*/
guest_exit();
preempt_enable();
vcpu->arch.srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
ret = kvm_riscv_vcpu_exit(vcpu, run, &trap);
}
kvm_sigset_deactivate(vcpu);
vcpu_put(vcpu);
srcu_read_unlock(&vcpu->kvm->srcu, vcpu->arch.srcu_idx);
return ret;
}

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arch/riscv/kvm/vcpu_exit.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#include <linux/bitops.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/kvm_host.h>
#include <asm/csr.h>
#define INSN_OPCODE_MASK 0x007c
#define INSN_OPCODE_SHIFT 2
#define INSN_OPCODE_SYSTEM 28
#define INSN_MASK_WFI 0xffffffff
#define INSN_MATCH_WFI 0x10500073
#define INSN_MATCH_LB 0x3
#define INSN_MASK_LB 0x707f
#define INSN_MATCH_LH 0x1003
#define INSN_MASK_LH 0x707f
#define INSN_MATCH_LW 0x2003
#define INSN_MASK_LW 0x707f
#define INSN_MATCH_LD 0x3003
#define INSN_MASK_LD 0x707f
#define INSN_MATCH_LBU 0x4003
#define INSN_MASK_LBU 0x707f
#define INSN_MATCH_LHU 0x5003
#define INSN_MASK_LHU 0x707f
#define INSN_MATCH_LWU 0x6003
#define INSN_MASK_LWU 0x707f
#define INSN_MATCH_SB 0x23
#define INSN_MASK_SB 0x707f
#define INSN_MATCH_SH 0x1023
#define INSN_MASK_SH 0x707f
#define INSN_MATCH_SW 0x2023
#define INSN_MASK_SW 0x707f
#define INSN_MATCH_SD 0x3023
#define INSN_MASK_SD 0x707f
#define INSN_MATCH_C_LD 0x6000
#define INSN_MASK_C_LD 0xe003
#define INSN_MATCH_C_SD 0xe000
#define INSN_MASK_C_SD 0xe003
#define INSN_MATCH_C_LW 0x4000
#define INSN_MASK_C_LW 0xe003
#define INSN_MATCH_C_SW 0xc000
#define INSN_MASK_C_SW 0xe003
#define INSN_MATCH_C_LDSP 0x6002
#define INSN_MASK_C_LDSP 0xe003
#define INSN_MATCH_C_SDSP 0xe002
#define INSN_MASK_C_SDSP 0xe003
#define INSN_MATCH_C_LWSP 0x4002
#define INSN_MASK_C_LWSP 0xe003
#define INSN_MATCH_C_SWSP 0xc002
#define INSN_MASK_C_SWSP 0xe003
#define INSN_16BIT_MASK 0x3
#define INSN_IS_16BIT(insn) (((insn) & INSN_16BIT_MASK) != INSN_16BIT_MASK)
#define INSN_LEN(insn) (INSN_IS_16BIT(insn) ? 2 : 4)
#ifdef CONFIG_64BIT
#define LOG_REGBYTES 3
#else
#define LOG_REGBYTES 2
#endif
#define REGBYTES (1 << LOG_REGBYTES)
#define SH_RD 7
#define SH_RS1 15
#define SH_RS2 20
#define SH_RS2C 2
#define RV_X(x, s, n) (((x) >> (s)) & ((1 << (n)) - 1))
#define RVC_LW_IMM(x) ((RV_X(x, 6, 1) << 2) | \
(RV_X(x, 10, 3) << 3) | \
(RV_X(x, 5, 1) << 6))
#define RVC_LD_IMM(x) ((RV_X(x, 10, 3) << 3) | \
(RV_X(x, 5, 2) << 6))
#define RVC_LWSP_IMM(x) ((RV_X(x, 4, 3) << 2) | \
(RV_X(x, 12, 1) << 5) | \
(RV_X(x, 2, 2) << 6))
#define RVC_LDSP_IMM(x) ((RV_X(x, 5, 2) << 3) | \
(RV_X(x, 12, 1) << 5) | \
(RV_X(x, 2, 3) << 6))
#define RVC_SWSP_IMM(x) ((RV_X(x, 9, 4) << 2) | \
(RV_X(x, 7, 2) << 6))
#define RVC_SDSP_IMM(x) ((RV_X(x, 10, 3) << 3) | \
(RV_X(x, 7, 3) << 6))
#define RVC_RS1S(insn) (8 + RV_X(insn, SH_RD, 3))
#define RVC_RS2S(insn) (8 + RV_X(insn, SH_RS2C, 3))
#define RVC_RS2(insn) RV_X(insn, SH_RS2C, 5)
#define SHIFT_RIGHT(x, y) \
((y) < 0 ? ((x) << -(y)) : ((x) >> (y)))
#define REG_MASK \
((1 << (5 + LOG_REGBYTES)) - (1 << LOG_REGBYTES))
#define REG_OFFSET(insn, pos) \
(SHIFT_RIGHT((insn), (pos) - LOG_REGBYTES) & REG_MASK)
#define REG_PTR(insn, pos, regs) \
((ulong *)((ulong)(regs) + REG_OFFSET(insn, pos)))
#define GET_RM(insn) (((insn) >> 12) & 7)
#define GET_RS1(insn, regs) (*REG_PTR(insn, SH_RS1, regs))
#define GET_RS2(insn, regs) (*REG_PTR(insn, SH_RS2, regs))
#define GET_RS1S(insn, regs) (*REG_PTR(RVC_RS1S(insn), 0, regs))
#define GET_RS2S(insn, regs) (*REG_PTR(RVC_RS2S(insn), 0, regs))
#define GET_RS2C(insn, regs) (*REG_PTR(insn, SH_RS2C, regs))
#define GET_SP(regs) (*REG_PTR(2, 0, regs))
#define SET_RD(insn, regs, val) (*REG_PTR(insn, SH_RD, regs) = (val))
#define IMM_I(insn) ((s32)(insn) >> 20)
#define IMM_S(insn) (((s32)(insn) >> 25 << 5) | \
(s32)(((insn) >> 7) & 0x1f))
#define MASK_FUNCT3 0x7000
static int truly_illegal_insn(struct kvm_vcpu *vcpu,
struct kvm_run *run,
ulong insn)
{
struct kvm_cpu_trap utrap = { 0 };
/* Redirect trap to Guest VCPU */
utrap.sepc = vcpu->arch.guest_context.sepc;
utrap.scause = EXC_INST_ILLEGAL;
utrap.stval = insn;
kvm_riscv_vcpu_trap_redirect(vcpu, &utrap);
return 1;
}
static int system_opcode_insn(struct kvm_vcpu *vcpu,
struct kvm_run *run,
ulong insn)
{
if ((insn & INSN_MASK_WFI) == INSN_MATCH_WFI) {
vcpu->stat.wfi_exit_stat++;
if (!kvm_arch_vcpu_runnable(vcpu)) {
srcu_read_unlock(&vcpu->kvm->srcu, vcpu->arch.srcu_idx);
kvm_vcpu_block(vcpu);
vcpu->arch.srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
kvm_clear_request(KVM_REQ_UNHALT, vcpu);
}
vcpu->arch.guest_context.sepc += INSN_LEN(insn);
return 1;
}
return truly_illegal_insn(vcpu, run, insn);
}
static int virtual_inst_fault(struct kvm_vcpu *vcpu, struct kvm_run *run,
struct kvm_cpu_trap *trap)
{
unsigned long insn = trap->stval;
struct kvm_cpu_trap utrap = { 0 };
struct kvm_cpu_context *ct;
if (unlikely(INSN_IS_16BIT(insn))) {
if (insn == 0) {
ct = &vcpu->arch.guest_context;
insn = kvm_riscv_vcpu_unpriv_read(vcpu, true,
ct->sepc,
&utrap);
if (utrap.scause) {
utrap.sepc = ct->sepc;
kvm_riscv_vcpu_trap_redirect(vcpu, &utrap);
return 1;
}
}
if (INSN_IS_16BIT(insn))
return truly_illegal_insn(vcpu, run, insn);
}
switch ((insn & INSN_OPCODE_MASK) >> INSN_OPCODE_SHIFT) {
case INSN_OPCODE_SYSTEM:
return system_opcode_insn(vcpu, run, insn);
default:
return truly_illegal_insn(vcpu, run, insn);
}
}
static int emulate_load(struct kvm_vcpu *vcpu, struct kvm_run *run,
unsigned long fault_addr, unsigned long htinst)
{
u8 data_buf[8];
unsigned long insn;
int shift = 0, len = 0, insn_len = 0;
struct kvm_cpu_trap utrap = { 0 };
struct kvm_cpu_context *ct = &vcpu->arch.guest_context;
/* Determine trapped instruction */
if (htinst & 0x1) {
/*
* Bit[0] == 1 implies trapped instruction value is
* transformed instruction or custom instruction.
*/
insn = htinst | INSN_16BIT_MASK;
insn_len = (htinst & BIT(1)) ? INSN_LEN(insn) : 2;
} else {
/*
* Bit[0] == 0 implies trapped instruction value is
* zero or special value.
*/
insn = kvm_riscv_vcpu_unpriv_read(vcpu, true, ct->sepc,
&utrap);
if (utrap.scause) {
/* Redirect trap if we failed to read instruction */
utrap.sepc = ct->sepc;
kvm_riscv_vcpu_trap_redirect(vcpu, &utrap);
return 1;
}
insn_len = INSN_LEN(insn);
}
/* Decode length of MMIO and shift */
if ((insn & INSN_MASK_LW) == INSN_MATCH_LW) {
len = 4;
shift = 8 * (sizeof(ulong) - len);
} else if ((insn & INSN_MASK_LB) == INSN_MATCH_LB) {
len = 1;
shift = 8 * (sizeof(ulong) - len);
} else if ((insn & INSN_MASK_LBU) == INSN_MATCH_LBU) {
len = 1;
shift = 8 * (sizeof(ulong) - len);
#ifdef CONFIG_64BIT
} else if ((insn & INSN_MASK_LD) == INSN_MATCH_LD) {
len = 8;
shift = 8 * (sizeof(ulong) - len);
} else if ((insn & INSN_MASK_LWU) == INSN_MATCH_LWU) {
len = 4;
#endif
} else if ((insn & INSN_MASK_LH) == INSN_MATCH_LH) {
len = 2;
shift = 8 * (sizeof(ulong) - len);
} else if ((insn & INSN_MASK_LHU) == INSN_MATCH_LHU) {
len = 2;
#ifdef CONFIG_64BIT
} else if ((insn & INSN_MASK_C_LD) == INSN_MATCH_C_LD) {
len = 8;
shift = 8 * (sizeof(ulong) - len);
insn = RVC_RS2S(insn) << SH_RD;
} else if ((insn & INSN_MASK_C_LDSP) == INSN_MATCH_C_LDSP &&
((insn >> SH_RD) & 0x1f)) {
len = 8;
shift = 8 * (sizeof(ulong) - len);
#endif
} else if ((insn & INSN_MASK_C_LW) == INSN_MATCH_C_LW) {
len = 4;
shift = 8 * (sizeof(ulong) - len);
insn = RVC_RS2S(insn) << SH_RD;
} else if ((insn & INSN_MASK_C_LWSP) == INSN_MATCH_C_LWSP &&
((insn >> SH_RD) & 0x1f)) {
len = 4;
shift = 8 * (sizeof(ulong) - len);
} else {
return -EOPNOTSUPP;
}
/* Fault address should be aligned to length of MMIO */
if (fault_addr & (len - 1))
return -EIO;
/* Save instruction decode info */
vcpu->arch.mmio_decode.insn = insn;
vcpu->arch.mmio_decode.insn_len = insn_len;
vcpu->arch.mmio_decode.shift = shift;
vcpu->arch.mmio_decode.len = len;
vcpu->arch.mmio_decode.return_handled = 0;
/* Update MMIO details in kvm_run struct */
run->mmio.is_write = false;
run->mmio.phys_addr = fault_addr;
run->mmio.len = len;
/* Try to handle MMIO access in the kernel */
if (!kvm_io_bus_read(vcpu, KVM_MMIO_BUS, fault_addr, len, data_buf)) {
/* Successfully handled MMIO access in the kernel so resume */
memcpy(run->mmio.data, data_buf, len);
vcpu->stat.mmio_exit_kernel++;
kvm_riscv_vcpu_mmio_return(vcpu, run);
return 1;
}
/* Exit to userspace for MMIO emulation */
vcpu->stat.mmio_exit_user++;
run->exit_reason = KVM_EXIT_MMIO;
return 0;
}
static int emulate_store(struct kvm_vcpu *vcpu, struct kvm_run *run,
unsigned long fault_addr, unsigned long htinst)
{
u8 data8;
u16 data16;
u32 data32;
u64 data64;
ulong data;
unsigned long insn;
int len = 0, insn_len = 0;
struct kvm_cpu_trap utrap = { 0 };
struct kvm_cpu_context *ct = &vcpu->arch.guest_context;
/* Determine trapped instruction */
if (htinst & 0x1) {
/*
* Bit[0] == 1 implies trapped instruction value is
* transformed instruction or custom instruction.
*/
insn = htinst | INSN_16BIT_MASK;
insn_len = (htinst & BIT(1)) ? INSN_LEN(insn) : 2;
} else {
/*
* Bit[0] == 0 implies trapped instruction value is
* zero or special value.
*/
insn = kvm_riscv_vcpu_unpriv_read(vcpu, true, ct->sepc,
&utrap);
if (utrap.scause) {
/* Redirect trap if we failed to read instruction */
utrap.sepc = ct->sepc;
kvm_riscv_vcpu_trap_redirect(vcpu, &utrap);
return 1;
}
insn_len = INSN_LEN(insn);
}
data = GET_RS2(insn, &vcpu->arch.guest_context);
data8 = data16 = data32 = data64 = data;
if ((insn & INSN_MASK_SW) == INSN_MATCH_SW) {
len = 4;
} else if ((insn & INSN_MASK_SB) == INSN_MATCH_SB) {
len = 1;
#ifdef CONFIG_64BIT
} else if ((insn & INSN_MASK_SD) == INSN_MATCH_SD) {
len = 8;
#endif
} else if ((insn & INSN_MASK_SH) == INSN_MATCH_SH) {
len = 2;
#ifdef CONFIG_64BIT
} else if ((insn & INSN_MASK_C_SD) == INSN_MATCH_C_SD) {
len = 8;
data64 = GET_RS2S(insn, &vcpu->arch.guest_context);
} else if ((insn & INSN_MASK_C_SDSP) == INSN_MATCH_C_SDSP &&
((insn >> SH_RD) & 0x1f)) {
len = 8;
data64 = GET_RS2C(insn, &vcpu->arch.guest_context);
#endif
} else if ((insn & INSN_MASK_C_SW) == INSN_MATCH_C_SW) {
len = 4;
data32 = GET_RS2S(insn, &vcpu->arch.guest_context);
} else if ((insn & INSN_MASK_C_SWSP) == INSN_MATCH_C_SWSP &&
((insn >> SH_RD) & 0x1f)) {
len = 4;
data32 = GET_RS2C(insn, &vcpu->arch.guest_context);
} else {
return -EOPNOTSUPP;
}
/* Fault address should be aligned to length of MMIO */
if (fault_addr & (len - 1))
return -EIO;
/* Save instruction decode info */
vcpu->arch.mmio_decode.insn = insn;
vcpu->arch.mmio_decode.insn_len = insn_len;
vcpu->arch.mmio_decode.shift = 0;
vcpu->arch.mmio_decode.len = len;
vcpu->arch.mmio_decode.return_handled = 0;
/* Copy data to kvm_run instance */
switch (len) {
case 1:
*((u8 *)run->mmio.data) = data8;
break;
case 2:
*((u16 *)run->mmio.data) = data16;
break;
case 4:
*((u32 *)run->mmio.data) = data32;
break;
case 8:
*((u64 *)run->mmio.data) = data64;
break;
default:
return -EOPNOTSUPP;
};
/* Update MMIO details in kvm_run struct */
run->mmio.is_write = true;
run->mmio.phys_addr = fault_addr;
run->mmio.len = len;
/* Try to handle MMIO access in the kernel */
if (!kvm_io_bus_write(vcpu, KVM_MMIO_BUS,
fault_addr, len, run->mmio.data)) {
/* Successfully handled MMIO access in the kernel so resume */
vcpu->stat.mmio_exit_kernel++;
kvm_riscv_vcpu_mmio_return(vcpu, run);
return 1;
}
/* Exit to userspace for MMIO emulation */
vcpu->stat.mmio_exit_user++;
run->exit_reason = KVM_EXIT_MMIO;
return 0;
}
static int stage2_page_fault(struct kvm_vcpu *vcpu, struct kvm_run *run,
struct kvm_cpu_trap *trap)
{
struct kvm_memory_slot *memslot;
unsigned long hva, fault_addr;
bool writeable;
gfn_t gfn;
int ret;
fault_addr = (trap->htval << 2) | (trap->stval & 0x3);
gfn = fault_addr >> PAGE_SHIFT;
memslot = gfn_to_memslot(vcpu->kvm, gfn);
hva = gfn_to_hva_memslot_prot(memslot, gfn, &writeable);
if (kvm_is_error_hva(hva) ||
(trap->scause == EXC_STORE_GUEST_PAGE_FAULT && !writeable)) {
switch (trap->scause) {
case EXC_LOAD_GUEST_PAGE_FAULT:
return emulate_load(vcpu, run, fault_addr,
trap->htinst);
case EXC_STORE_GUEST_PAGE_FAULT:
return emulate_store(vcpu, run, fault_addr,
trap->htinst);
default:
return -EOPNOTSUPP;
};
}
ret = kvm_riscv_stage2_map(vcpu, memslot, fault_addr, hva,
(trap->scause == EXC_STORE_GUEST_PAGE_FAULT) ? true : false);
if (ret < 0)
return ret;
return 1;
}
/**
* kvm_riscv_vcpu_unpriv_read -- Read machine word from Guest memory
*
* @vcpu: The VCPU pointer
* @read_insn: Flag representing whether we are reading instruction
* @guest_addr: Guest address to read
* @trap: Output pointer to trap details
*/
unsigned long kvm_riscv_vcpu_unpriv_read(struct kvm_vcpu *vcpu,
bool read_insn,
unsigned long guest_addr,
struct kvm_cpu_trap *trap)
{
register unsigned long taddr asm("a0") = (unsigned long)trap;
register unsigned long ttmp asm("a1");
register unsigned long val asm("t0");
register unsigned long tmp asm("t1");
register unsigned long addr asm("t2") = guest_addr;
unsigned long flags;
unsigned long old_stvec, old_hstatus;
local_irq_save(flags);
old_hstatus = csr_swap(CSR_HSTATUS, vcpu->arch.guest_context.hstatus);
old_stvec = csr_swap(CSR_STVEC, (ulong)&__kvm_riscv_unpriv_trap);
if (read_insn) {
/*
* HLVX.HU instruction
* 0110010 00011 rs1 100 rd 1110011
*/
asm volatile ("\n"
".option push\n"
".option norvc\n"
"add %[ttmp], %[taddr], 0\n"
/*
* HLVX.HU %[val], (%[addr])
* HLVX.HU t0, (t2)
* 0110010 00011 00111 100 00101 1110011
*/
".word 0x6433c2f3\n"
"andi %[tmp], %[val], 3\n"
"addi %[tmp], %[tmp], -3\n"
"bne %[tmp], zero, 2f\n"
"addi %[addr], %[addr], 2\n"
/*
* HLVX.HU %[tmp], (%[addr])
* HLVX.HU t1, (t2)
* 0110010 00011 00111 100 00110 1110011
*/
".word 0x6433c373\n"
"sll %[tmp], %[tmp], 16\n"
"add %[val], %[val], %[tmp]\n"
"2:\n"
".option pop"
: [val] "=&r" (val), [tmp] "=&r" (tmp),
[taddr] "+&r" (taddr), [ttmp] "+&r" (ttmp),
[addr] "+&r" (addr) : : "memory");
if (trap->scause == EXC_LOAD_PAGE_FAULT)
trap->scause = EXC_INST_PAGE_FAULT;
} else {
/*
* HLV.D instruction
* 0110110 00000 rs1 100 rd 1110011
*
* HLV.W instruction
* 0110100 00000 rs1 100 rd 1110011
*/
asm volatile ("\n"
".option push\n"
".option norvc\n"
"add %[ttmp], %[taddr], 0\n"
#ifdef CONFIG_64BIT
/*
* HLV.D %[val], (%[addr])
* HLV.D t0, (t2)
* 0110110 00000 00111 100 00101 1110011
*/
".word 0x6c03c2f3\n"
#else
/*
* HLV.W %[val], (%[addr])
* HLV.W t0, (t2)
* 0110100 00000 00111 100 00101 1110011
*/
".word 0x6803c2f3\n"
#endif
".option pop"
: [val] "=&r" (val),
[taddr] "+&r" (taddr), [ttmp] "+&r" (ttmp)
: [addr] "r" (addr) : "memory");
}
csr_write(CSR_STVEC, old_stvec);
csr_write(CSR_HSTATUS, old_hstatus);
local_irq_restore(flags);
return val;
}
/**
* kvm_riscv_vcpu_trap_redirect -- Redirect trap to Guest
*
* @vcpu: The VCPU pointer
* @trap: Trap details
*/
void kvm_riscv_vcpu_trap_redirect(struct kvm_vcpu *vcpu,
struct kvm_cpu_trap *trap)
{
unsigned long vsstatus = csr_read(CSR_VSSTATUS);
/* Change Guest SSTATUS.SPP bit */
vsstatus &= ~SR_SPP;
if (vcpu->arch.guest_context.sstatus & SR_SPP)
vsstatus |= SR_SPP;
/* Change Guest SSTATUS.SPIE bit */
vsstatus &= ~SR_SPIE;
if (vsstatus & SR_SIE)
vsstatus |= SR_SPIE;
/* Clear Guest SSTATUS.SIE bit */
vsstatus &= ~SR_SIE;
/* Update Guest SSTATUS */
csr_write(CSR_VSSTATUS, vsstatus);
/* Update Guest SCAUSE, STVAL, and SEPC */
csr_write(CSR_VSCAUSE, trap->scause);
csr_write(CSR_VSTVAL, trap->stval);
csr_write(CSR_VSEPC, trap->sepc);
/* Set Guest PC to Guest exception vector */
vcpu->arch.guest_context.sepc = csr_read(CSR_VSTVEC);
}
/**
* kvm_riscv_vcpu_mmio_return -- Handle MMIO loads after user space emulation
* or in-kernel IO emulation
*
* @vcpu: The VCPU pointer
* @run: The VCPU run struct containing the mmio data
*/
int kvm_riscv_vcpu_mmio_return(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
u8 data8;
u16 data16;
u32 data32;
u64 data64;
ulong insn;
int len, shift;
if (vcpu->arch.mmio_decode.return_handled)
return 0;
vcpu->arch.mmio_decode.return_handled = 1;
insn = vcpu->arch.mmio_decode.insn;
if (run->mmio.is_write)
goto done;
len = vcpu->arch.mmio_decode.len;
shift = vcpu->arch.mmio_decode.shift;
switch (len) {
case 1:
data8 = *((u8 *)run->mmio.data);
SET_RD(insn, &vcpu->arch.guest_context,
(ulong)data8 << shift >> shift);
break;
case 2:
data16 = *((u16 *)run->mmio.data);
SET_RD(insn, &vcpu->arch.guest_context,
(ulong)data16 << shift >> shift);
break;
case 4:
data32 = *((u32 *)run->mmio.data);
SET_RD(insn, &vcpu->arch.guest_context,
(ulong)data32 << shift >> shift);
break;
case 8:
data64 = *((u64 *)run->mmio.data);
SET_RD(insn, &vcpu->arch.guest_context,
(ulong)data64 << shift >> shift);
break;
default:
return -EOPNOTSUPP;
};
done:
/* Move to next instruction */
vcpu->arch.guest_context.sepc += vcpu->arch.mmio_decode.insn_len;
return 0;
}
/*
* Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on
* proper exit to userspace.
*/
int kvm_riscv_vcpu_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
struct kvm_cpu_trap *trap)
{
int ret;
/* If we got host interrupt then do nothing */
if (trap->scause & CAUSE_IRQ_FLAG)
return 1;
/* Handle guest traps */
ret = -EFAULT;
run->exit_reason = KVM_EXIT_UNKNOWN;
switch (trap->scause) {
case EXC_VIRTUAL_INST_FAULT:
if (vcpu->arch.guest_context.hstatus & HSTATUS_SPV)
ret = virtual_inst_fault(vcpu, run, trap);
break;
case EXC_INST_GUEST_PAGE_FAULT:
case EXC_LOAD_GUEST_PAGE_FAULT:
case EXC_STORE_GUEST_PAGE_FAULT:
if (vcpu->arch.guest_context.hstatus & HSTATUS_SPV)
ret = stage2_page_fault(vcpu, run, trap);
break;
case EXC_SUPERVISOR_SYSCALL:
if (vcpu->arch.guest_context.hstatus & HSTATUS_SPV)
ret = kvm_riscv_vcpu_sbi_ecall(vcpu, run);
break;
default:
break;
};
/* Print details in-case of error */
if (ret < 0) {
kvm_err("VCPU exit error %d\n", ret);
kvm_err("SEPC=0x%lx SSTATUS=0x%lx HSTATUS=0x%lx\n",
vcpu->arch.guest_context.sepc,
vcpu->arch.guest_context.sstatus,
vcpu->arch.guest_context.hstatus);
kvm_err("SCAUSE=0x%lx STVAL=0x%lx HTVAL=0x%lx HTINST=0x%lx\n",
trap->scause, trap->stval, trap->htval, trap->htinst);
}
return ret;
}

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arch/riscv/kvm/vcpu_sbi.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/**
* Copyright (c) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Atish Patra <atish.patra@wdc.com>
*/
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/kvm_host.h>
#include <asm/csr.h>
#include <asm/sbi.h>
#include <asm/kvm_vcpu_timer.h>
#define SBI_VERSION_MAJOR 0
#define SBI_VERSION_MINOR 1
static void kvm_riscv_vcpu_sbi_forward(struct kvm_vcpu *vcpu,
struct kvm_run *run)
{
struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
vcpu->arch.sbi_context.return_handled = 0;
vcpu->stat.ecall_exit_stat++;
run->exit_reason = KVM_EXIT_RISCV_SBI;
run->riscv_sbi.extension_id = cp->a7;
run->riscv_sbi.function_id = cp->a6;
run->riscv_sbi.args[0] = cp->a0;
run->riscv_sbi.args[1] = cp->a1;
run->riscv_sbi.args[2] = cp->a2;
run->riscv_sbi.args[3] = cp->a3;
run->riscv_sbi.args[4] = cp->a4;
run->riscv_sbi.args[5] = cp->a5;
run->riscv_sbi.ret[0] = cp->a0;
run->riscv_sbi.ret[1] = cp->a1;
}
int kvm_riscv_vcpu_sbi_return(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
/* Handle SBI return only once */
if (vcpu->arch.sbi_context.return_handled)
return 0;
vcpu->arch.sbi_context.return_handled = 1;
/* Update return values */
cp->a0 = run->riscv_sbi.ret[0];
cp->a1 = run->riscv_sbi.ret[1];
/* Move to next instruction */
vcpu->arch.guest_context.sepc += 4;
return 0;
}
#ifdef CONFIG_RISCV_SBI_V01
static void kvm_sbi_system_shutdown(struct kvm_vcpu *vcpu,
struct kvm_run *run, u32 type)
{
int i;
struct kvm_vcpu *tmp;
kvm_for_each_vcpu(i, tmp, vcpu->kvm)
tmp->arch.power_off = true;
kvm_make_all_cpus_request(vcpu->kvm, KVM_REQ_SLEEP);
memset(&run->system_event, 0, sizeof(run->system_event));
run->system_event.type = type;
run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
}
int kvm_riscv_vcpu_sbi_ecall(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
ulong hmask;
int i, ret = 1;
u64 next_cycle;
struct kvm_vcpu *rvcpu;
bool next_sepc = true;
struct cpumask cm, hm;
struct kvm *kvm = vcpu->kvm;
struct kvm_cpu_trap utrap = { 0 };
struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
if (!cp)
return -EINVAL;
switch (cp->a7) {
case SBI_EXT_0_1_CONSOLE_GETCHAR:
case SBI_EXT_0_1_CONSOLE_PUTCHAR:
/*
* The CONSOLE_GETCHAR/CONSOLE_PUTCHAR SBI calls cannot be
* handled in kernel so we forward these to user-space
*/
kvm_riscv_vcpu_sbi_forward(vcpu, run);
next_sepc = false;
ret = 0;
break;
case SBI_EXT_0_1_SET_TIMER:
#if __riscv_xlen == 32
next_cycle = ((u64)cp->a1 << 32) | (u64)cp->a0;
#else
next_cycle = (u64)cp->a0;
#endif
kvm_riscv_vcpu_timer_next_event(vcpu, next_cycle);
break;
case SBI_EXT_0_1_CLEAR_IPI:
kvm_riscv_vcpu_unset_interrupt(vcpu, IRQ_VS_SOFT);
break;
case SBI_EXT_0_1_SEND_IPI:
if (cp->a0)
hmask = kvm_riscv_vcpu_unpriv_read(vcpu, false, cp->a0,
&utrap);
else
hmask = (1UL << atomic_read(&kvm->online_vcpus)) - 1;
if (utrap.scause) {
utrap.sepc = cp->sepc;
kvm_riscv_vcpu_trap_redirect(vcpu, &utrap);
next_sepc = false;
break;
}
for_each_set_bit(i, &hmask, BITS_PER_LONG) {
rvcpu = kvm_get_vcpu_by_id(vcpu->kvm, i);
kvm_riscv_vcpu_set_interrupt(rvcpu, IRQ_VS_SOFT);
}
break;
case SBI_EXT_0_1_SHUTDOWN:
kvm_sbi_system_shutdown(vcpu, run, KVM_SYSTEM_EVENT_SHUTDOWN);
next_sepc = false;
ret = 0;
break;
case SBI_EXT_0_1_REMOTE_FENCE_I:
case SBI_EXT_0_1_REMOTE_SFENCE_VMA:
case SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID:
if (cp->a0)
hmask = kvm_riscv_vcpu_unpriv_read(vcpu, false, cp->a0,
&utrap);
else
hmask = (1UL << atomic_read(&kvm->online_vcpus)) - 1;
if (utrap.scause) {
utrap.sepc = cp->sepc;
kvm_riscv_vcpu_trap_redirect(vcpu, &utrap);
next_sepc = false;
break;
}
cpumask_clear(&cm);
for_each_set_bit(i, &hmask, BITS_PER_LONG) {
rvcpu = kvm_get_vcpu_by_id(vcpu->kvm, i);
if (rvcpu->cpu < 0)
continue;
cpumask_set_cpu(rvcpu->cpu, &cm);
}
riscv_cpuid_to_hartid_mask(&cm, &hm);
if (cp->a7 == SBI_EXT_0_1_REMOTE_FENCE_I)
sbi_remote_fence_i(cpumask_bits(&hm));
else if (cp->a7 == SBI_EXT_0_1_REMOTE_SFENCE_VMA)
sbi_remote_hfence_vvma(cpumask_bits(&hm),
cp->a1, cp->a2);
else
sbi_remote_hfence_vvma_asid(cpumask_bits(&hm),
cp->a1, cp->a2, cp->a3);
break;
default:
/* Return error for unsupported SBI calls */
cp->a0 = SBI_ERR_NOT_SUPPORTED;
break;
};
if (next_sepc)
cp->sepc += 4;
return ret;
}
#else
int kvm_riscv_vcpu_sbi_ecall(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
kvm_riscv_vcpu_sbi_forward(vcpu, run);
return 0;
}
#endif

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arch/riscv/kvm/vcpu_switch.S Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#include <linux/linkage.h>
#include <asm/asm.h>
#include <asm/asm-offsets.h>
#include <asm/csr.h>
.text
.altmacro
.option norelax
ENTRY(__kvm_riscv_switch_to)
/* Save Host GPRs (except A0 and T0-T6) */
REG_S ra, (KVM_ARCH_HOST_RA)(a0)
REG_S sp, (KVM_ARCH_HOST_SP)(a0)
REG_S gp, (KVM_ARCH_HOST_GP)(a0)
REG_S tp, (KVM_ARCH_HOST_TP)(a0)
REG_S s0, (KVM_ARCH_HOST_S0)(a0)
REG_S s1, (KVM_ARCH_HOST_S1)(a0)
REG_S a1, (KVM_ARCH_HOST_A1)(a0)
REG_S a2, (KVM_ARCH_HOST_A2)(a0)
REG_S a3, (KVM_ARCH_HOST_A3)(a0)
REG_S a4, (KVM_ARCH_HOST_A4)(a0)
REG_S a5, (KVM_ARCH_HOST_A5)(a0)
REG_S a6, (KVM_ARCH_HOST_A6)(a0)
REG_S a7, (KVM_ARCH_HOST_A7)(a0)
REG_S s2, (KVM_ARCH_HOST_S2)(a0)
REG_S s3, (KVM_ARCH_HOST_S3)(a0)
REG_S s4, (KVM_ARCH_HOST_S4)(a0)
REG_S s5, (KVM_ARCH_HOST_S5)(a0)
REG_S s6, (KVM_ARCH_HOST_S6)(a0)
REG_S s7, (KVM_ARCH_HOST_S7)(a0)
REG_S s8, (KVM_ARCH_HOST_S8)(a0)
REG_S s9, (KVM_ARCH_HOST_S9)(a0)
REG_S s10, (KVM_ARCH_HOST_S10)(a0)
REG_S s11, (KVM_ARCH_HOST_S11)(a0)
/* Save Host and Restore Guest SSTATUS */
REG_L t0, (KVM_ARCH_GUEST_SSTATUS)(a0)
csrrw t0, CSR_SSTATUS, t0
REG_S t0, (KVM_ARCH_HOST_SSTATUS)(a0)
/* Save Host and Restore Guest HSTATUS */
REG_L t1, (KVM_ARCH_GUEST_HSTATUS)(a0)
csrrw t1, CSR_HSTATUS, t1
REG_S t1, (KVM_ARCH_HOST_HSTATUS)(a0)
/* Save Host and Restore Guest SCOUNTEREN */
REG_L t2, (KVM_ARCH_GUEST_SCOUNTEREN)(a0)
csrrw t2, CSR_SCOUNTEREN, t2
REG_S t2, (KVM_ARCH_HOST_SCOUNTEREN)(a0)
/* Save Host SSCRATCH and change it to struct kvm_vcpu_arch pointer */
csrrw t3, CSR_SSCRATCH, a0
REG_S t3, (KVM_ARCH_HOST_SSCRATCH)(a0)
/* Save Host STVEC and change it to return path */
la t4, __kvm_switch_return
csrrw t4, CSR_STVEC, t4
REG_S t4, (KVM_ARCH_HOST_STVEC)(a0)
/* Restore Guest SEPC */
REG_L t0, (KVM_ARCH_GUEST_SEPC)(a0)
csrw CSR_SEPC, t0
/* Restore Guest GPRs (except A0) */
REG_L ra, (KVM_ARCH_GUEST_RA)(a0)
REG_L sp, (KVM_ARCH_GUEST_SP)(a0)
REG_L gp, (KVM_ARCH_GUEST_GP)(a0)
REG_L tp, (KVM_ARCH_GUEST_TP)(a0)
REG_L t0, (KVM_ARCH_GUEST_T0)(a0)
REG_L t1, (KVM_ARCH_GUEST_T1)(a0)
REG_L t2, (KVM_ARCH_GUEST_T2)(a0)
REG_L s0, (KVM_ARCH_GUEST_S0)(a0)
REG_L s1, (KVM_ARCH_GUEST_S1)(a0)
REG_L a1, (KVM_ARCH_GUEST_A1)(a0)
REG_L a2, (KVM_ARCH_GUEST_A2)(a0)
REG_L a3, (KVM_ARCH_GUEST_A3)(a0)
REG_L a4, (KVM_ARCH_GUEST_A4)(a0)
REG_L a5, (KVM_ARCH_GUEST_A5)(a0)
REG_L a6, (KVM_ARCH_GUEST_A6)(a0)
REG_L a7, (KVM_ARCH_GUEST_A7)(a0)
REG_L s2, (KVM_ARCH_GUEST_S2)(a0)
REG_L s3, (KVM_ARCH_GUEST_S3)(a0)
REG_L s4, (KVM_ARCH_GUEST_S4)(a0)
REG_L s5, (KVM_ARCH_GUEST_S5)(a0)
REG_L s6, (KVM_ARCH_GUEST_S6)(a0)
REG_L s7, (KVM_ARCH_GUEST_S7)(a0)
REG_L s8, (KVM_ARCH_GUEST_S8)(a0)
REG_L s9, (KVM_ARCH_GUEST_S9)(a0)
REG_L s10, (KVM_ARCH_GUEST_S10)(a0)
REG_L s11, (KVM_ARCH_GUEST_S11)(a0)
REG_L t3, (KVM_ARCH_GUEST_T3)(a0)
REG_L t4, (KVM_ARCH_GUEST_T4)(a0)
REG_L t5, (KVM_ARCH_GUEST_T5)(a0)
REG_L t6, (KVM_ARCH_GUEST_T6)(a0)
/* Restore Guest A0 */
REG_L a0, (KVM_ARCH_GUEST_A0)(a0)
/* Resume Guest */
sret
/* Back to Host */
.align 2
__kvm_switch_return:
/* Swap Guest A0 with SSCRATCH */
csrrw a0, CSR_SSCRATCH, a0
/* Save Guest GPRs (except A0) */
REG_S ra, (KVM_ARCH_GUEST_RA)(a0)
REG_S sp, (KVM_ARCH_GUEST_SP)(a0)
REG_S gp, (KVM_ARCH_GUEST_GP)(a0)
REG_S tp, (KVM_ARCH_GUEST_TP)(a0)
REG_S t0, (KVM_ARCH_GUEST_T0)(a0)
REG_S t1, (KVM_ARCH_GUEST_T1)(a0)
REG_S t2, (KVM_ARCH_GUEST_T2)(a0)
REG_S s0, (KVM_ARCH_GUEST_S0)(a0)
REG_S s1, (KVM_ARCH_GUEST_S1)(a0)
REG_S a1, (KVM_ARCH_GUEST_A1)(a0)
REG_S a2, (KVM_ARCH_GUEST_A2)(a0)
REG_S a3, (KVM_ARCH_GUEST_A3)(a0)
REG_S a4, (KVM_ARCH_GUEST_A4)(a0)
REG_S a5, (KVM_ARCH_GUEST_A5)(a0)
REG_S a6, (KVM_ARCH_GUEST_A6)(a0)
REG_S a7, (KVM_ARCH_GUEST_A7)(a0)
REG_S s2, (KVM_ARCH_GUEST_S2)(a0)
REG_S s3, (KVM_ARCH_GUEST_S3)(a0)
REG_S s4, (KVM_ARCH_GUEST_S4)(a0)
REG_S s5, (KVM_ARCH_GUEST_S5)(a0)
REG_S s6, (KVM_ARCH_GUEST_S6)(a0)
REG_S s7, (KVM_ARCH_GUEST_S7)(a0)
REG_S s8, (KVM_ARCH_GUEST_S8)(a0)
REG_S s9, (KVM_ARCH_GUEST_S9)(a0)
REG_S s10, (KVM_ARCH_GUEST_S10)(a0)
REG_S s11, (KVM_ARCH_GUEST_S11)(a0)
REG_S t3, (KVM_ARCH_GUEST_T3)(a0)
REG_S t4, (KVM_ARCH_GUEST_T4)(a0)
REG_S t5, (KVM_ARCH_GUEST_T5)(a0)
REG_S t6, (KVM_ARCH_GUEST_T6)(a0)
/* Save Guest SEPC */
csrr t0, CSR_SEPC
REG_S t0, (KVM_ARCH_GUEST_SEPC)(a0)
/* Restore Host STVEC */
REG_L t1, (KVM_ARCH_HOST_STVEC)(a0)
csrw CSR_STVEC, t1
/* Save Guest A0 and Restore Host SSCRATCH */
REG_L t2, (KVM_ARCH_HOST_SSCRATCH)(a0)
csrrw t2, CSR_SSCRATCH, t2
REG_S t2, (KVM_ARCH_GUEST_A0)(a0)
/* Save Guest and Restore Host SCOUNTEREN */
REG_L t3, (KVM_ARCH_HOST_SCOUNTEREN)(a0)
csrrw t3, CSR_SCOUNTEREN, t3
REG_S t3, (KVM_ARCH_GUEST_SCOUNTEREN)(a0)
/* Save Guest and Restore Host HSTATUS */
REG_L t4, (KVM_ARCH_HOST_HSTATUS)(a0)
csrrw t4, CSR_HSTATUS, t4
REG_S t4, (KVM_ARCH_GUEST_HSTATUS)(a0)
/* Save Guest and Restore Host SSTATUS */
REG_L t5, (KVM_ARCH_HOST_SSTATUS)(a0)
csrrw t5, CSR_SSTATUS, t5
REG_S t5, (KVM_ARCH_GUEST_SSTATUS)(a0)
/* Restore Host GPRs (except A0 and T0-T6) */
REG_L ra, (KVM_ARCH_HOST_RA)(a0)
REG_L sp, (KVM_ARCH_HOST_SP)(a0)
REG_L gp, (KVM_ARCH_HOST_GP)(a0)
REG_L tp, (KVM_ARCH_HOST_TP)(a0)
REG_L s0, (KVM_ARCH_HOST_S0)(a0)
REG_L s1, (KVM_ARCH_HOST_S1)(a0)
REG_L a1, (KVM_ARCH_HOST_A1)(a0)
REG_L a2, (KVM_ARCH_HOST_A2)(a0)
REG_L a3, (KVM_ARCH_HOST_A3)(a0)
REG_L a4, (KVM_ARCH_HOST_A4)(a0)
REG_L a5, (KVM_ARCH_HOST_A5)(a0)
REG_L a6, (KVM_ARCH_HOST_A6)(a0)
REG_L a7, (KVM_ARCH_HOST_A7)(a0)
REG_L s2, (KVM_ARCH_HOST_S2)(a0)
REG_L s3, (KVM_ARCH_HOST_S3)(a0)
REG_L s4, (KVM_ARCH_HOST_S4)(a0)
REG_L s5, (KVM_ARCH_HOST_S5)(a0)
REG_L s6, (KVM_ARCH_HOST_S6)(a0)
REG_L s7, (KVM_ARCH_HOST_S7)(a0)
REG_L s8, (KVM_ARCH_HOST_S8)(a0)
REG_L s9, (KVM_ARCH_HOST_S9)(a0)
REG_L s10, (KVM_ARCH_HOST_S10)(a0)
REG_L s11, (KVM_ARCH_HOST_S11)(a0)
/* Return to C code */
ret
ENDPROC(__kvm_riscv_switch_to)
ENTRY(__kvm_riscv_unpriv_trap)
/*
* We assume that faulting unpriv load/store instruction is
* 4-byte long and blindly increment SEPC by 4.
*
* The trap details will be saved at address pointed by 'A0'
* register and we use 'A1' register as temporary.
*/
csrr a1, CSR_SEPC
REG_S a1, (KVM_ARCH_TRAP_SEPC)(a0)
addi a1, a1, 4
csrw CSR_SEPC, a1
csrr a1, CSR_SCAUSE
REG_S a1, (KVM_ARCH_TRAP_SCAUSE)(a0)
csrr a1, CSR_STVAL
REG_S a1, (KVM_ARCH_TRAP_STVAL)(a0)
csrr a1, CSR_HTVAL
REG_S a1, (KVM_ARCH_TRAP_HTVAL)(a0)
csrr a1, CSR_HTINST
REG_S a1, (KVM_ARCH_TRAP_HTINST)(a0)
sret
ENDPROC(__kvm_riscv_unpriv_trap)
#ifdef CONFIG_FPU
.align 3
.global __kvm_riscv_fp_f_save
__kvm_riscv_fp_f_save:
csrr t2, CSR_SSTATUS
li t1, SR_FS
csrs CSR_SSTATUS, t1
frcsr t0
fsw f0, KVM_ARCH_FP_F_F0(a0)
fsw f1, KVM_ARCH_FP_F_F1(a0)
fsw f2, KVM_ARCH_FP_F_F2(a0)
fsw f3, KVM_ARCH_FP_F_F3(a0)
fsw f4, KVM_ARCH_FP_F_F4(a0)
fsw f5, KVM_ARCH_FP_F_F5(a0)
fsw f6, KVM_ARCH_FP_F_F6(a0)
fsw f7, KVM_ARCH_FP_F_F7(a0)
fsw f8, KVM_ARCH_FP_F_F8(a0)
fsw f9, KVM_ARCH_FP_F_F9(a0)
fsw f10, KVM_ARCH_FP_F_F10(a0)
fsw f11, KVM_ARCH_FP_F_F11(a0)
fsw f12, KVM_ARCH_FP_F_F12(a0)
fsw f13, KVM_ARCH_FP_F_F13(a0)
fsw f14, KVM_ARCH_FP_F_F14(a0)
fsw f15, KVM_ARCH_FP_F_F15(a0)
fsw f16, KVM_ARCH_FP_F_F16(a0)
fsw f17, KVM_ARCH_FP_F_F17(a0)
fsw f18, KVM_ARCH_FP_F_F18(a0)
fsw f19, KVM_ARCH_FP_F_F19(a0)
fsw f20, KVM_ARCH_FP_F_F20(a0)
fsw f21, KVM_ARCH_FP_F_F21(a0)
fsw f22, KVM_ARCH_FP_F_F22(a0)
fsw f23, KVM_ARCH_FP_F_F23(a0)
fsw f24, KVM_ARCH_FP_F_F24(a0)
fsw f25, KVM_ARCH_FP_F_F25(a0)
fsw f26, KVM_ARCH_FP_F_F26(a0)
fsw f27, KVM_ARCH_FP_F_F27(a0)
fsw f28, KVM_ARCH_FP_F_F28(a0)
fsw f29, KVM_ARCH_FP_F_F29(a0)
fsw f30, KVM_ARCH_FP_F_F30(a0)
fsw f31, KVM_ARCH_FP_F_F31(a0)
sw t0, KVM_ARCH_FP_F_FCSR(a0)
csrw CSR_SSTATUS, t2
ret
.align 3
.global __kvm_riscv_fp_d_save
__kvm_riscv_fp_d_save:
csrr t2, CSR_SSTATUS
li t1, SR_FS
csrs CSR_SSTATUS, t1
frcsr t0
fsd f0, KVM_ARCH_FP_D_F0(a0)
fsd f1, KVM_ARCH_FP_D_F1(a0)
fsd f2, KVM_ARCH_FP_D_F2(a0)
fsd f3, KVM_ARCH_FP_D_F3(a0)
fsd f4, KVM_ARCH_FP_D_F4(a0)
fsd f5, KVM_ARCH_FP_D_F5(a0)
fsd f6, KVM_ARCH_FP_D_F6(a0)
fsd f7, KVM_ARCH_FP_D_F7(a0)
fsd f8, KVM_ARCH_FP_D_F8(a0)
fsd f9, KVM_ARCH_FP_D_F9(a0)
fsd f10, KVM_ARCH_FP_D_F10(a0)
fsd f11, KVM_ARCH_FP_D_F11(a0)
fsd f12, KVM_ARCH_FP_D_F12(a0)
fsd f13, KVM_ARCH_FP_D_F13(a0)
fsd f14, KVM_ARCH_FP_D_F14(a0)
fsd f15, KVM_ARCH_FP_D_F15(a0)
fsd f16, KVM_ARCH_FP_D_F16(a0)
fsd f17, KVM_ARCH_FP_D_F17(a0)
fsd f18, KVM_ARCH_FP_D_F18(a0)
fsd f19, KVM_ARCH_FP_D_F19(a0)
fsd f20, KVM_ARCH_FP_D_F20(a0)
fsd f21, KVM_ARCH_FP_D_F21(a0)
fsd f22, KVM_ARCH_FP_D_F22(a0)
fsd f23, KVM_ARCH_FP_D_F23(a0)
fsd f24, KVM_ARCH_FP_D_F24(a0)
fsd f25, KVM_ARCH_FP_D_F25(a0)
fsd f26, KVM_ARCH_FP_D_F26(a0)
fsd f27, KVM_ARCH_FP_D_F27(a0)
fsd f28, KVM_ARCH_FP_D_F28(a0)
fsd f29, KVM_ARCH_FP_D_F29(a0)
fsd f30, KVM_ARCH_FP_D_F30(a0)
fsd f31, KVM_ARCH_FP_D_F31(a0)
sw t0, KVM_ARCH_FP_D_FCSR(a0)
csrw CSR_SSTATUS, t2
ret
.align 3
.global __kvm_riscv_fp_f_restore
__kvm_riscv_fp_f_restore:
csrr t2, CSR_SSTATUS
li t1, SR_FS
lw t0, KVM_ARCH_FP_F_FCSR(a0)
csrs CSR_SSTATUS, t1
flw f0, KVM_ARCH_FP_F_F0(a0)
flw f1, KVM_ARCH_FP_F_F1(a0)
flw f2, KVM_ARCH_FP_F_F2(a0)
flw f3, KVM_ARCH_FP_F_F3(a0)
flw f4, KVM_ARCH_FP_F_F4(a0)
flw f5, KVM_ARCH_FP_F_F5(a0)
flw f6, KVM_ARCH_FP_F_F6(a0)
flw f7, KVM_ARCH_FP_F_F7(a0)
flw f8, KVM_ARCH_FP_F_F8(a0)
flw f9, KVM_ARCH_FP_F_F9(a0)
flw f10, KVM_ARCH_FP_F_F10(a0)
flw f11, KVM_ARCH_FP_F_F11(a0)
flw f12, KVM_ARCH_FP_F_F12(a0)
flw f13, KVM_ARCH_FP_F_F13(a0)
flw f14, KVM_ARCH_FP_F_F14(a0)
flw f15, KVM_ARCH_FP_F_F15(a0)
flw f16, KVM_ARCH_FP_F_F16(a0)
flw f17, KVM_ARCH_FP_F_F17(a0)
flw f18, KVM_ARCH_FP_F_F18(a0)
flw f19, KVM_ARCH_FP_F_F19(a0)
flw f20, KVM_ARCH_FP_F_F20(a0)
flw f21, KVM_ARCH_FP_F_F21(a0)
flw f22, KVM_ARCH_FP_F_F22(a0)
flw f23, KVM_ARCH_FP_F_F23(a0)
flw f24, KVM_ARCH_FP_F_F24(a0)
flw f25, KVM_ARCH_FP_F_F25(a0)
flw f26, KVM_ARCH_FP_F_F26(a0)
flw f27, KVM_ARCH_FP_F_F27(a0)
flw f28, KVM_ARCH_FP_F_F28(a0)
flw f29, KVM_ARCH_FP_F_F29(a0)
flw f30, KVM_ARCH_FP_F_F30(a0)
flw f31, KVM_ARCH_FP_F_F31(a0)
fscsr t0
csrw CSR_SSTATUS, t2
ret
.align 3
.global __kvm_riscv_fp_d_restore
__kvm_riscv_fp_d_restore:
csrr t2, CSR_SSTATUS
li t1, SR_FS
lw t0, KVM_ARCH_FP_D_FCSR(a0)
csrs CSR_SSTATUS, t1
fld f0, KVM_ARCH_FP_D_F0(a0)
fld f1, KVM_ARCH_FP_D_F1(a0)
fld f2, KVM_ARCH_FP_D_F2(a0)
fld f3, KVM_ARCH_FP_D_F3(a0)
fld f4, KVM_ARCH_FP_D_F4(a0)
fld f5, KVM_ARCH_FP_D_F5(a0)
fld f6, KVM_ARCH_FP_D_F6(a0)
fld f7, KVM_ARCH_FP_D_F7(a0)
fld f8, KVM_ARCH_FP_D_F8(a0)
fld f9, KVM_ARCH_FP_D_F9(a0)
fld f10, KVM_ARCH_FP_D_F10(a0)
fld f11, KVM_ARCH_FP_D_F11(a0)
fld f12, KVM_ARCH_FP_D_F12(a0)
fld f13, KVM_ARCH_FP_D_F13(a0)
fld f14, KVM_ARCH_FP_D_F14(a0)
fld f15, KVM_ARCH_FP_D_F15(a0)
fld f16, KVM_ARCH_FP_D_F16(a0)
fld f17, KVM_ARCH_FP_D_F17(a0)
fld f18, KVM_ARCH_FP_D_F18(a0)
fld f19, KVM_ARCH_FP_D_F19(a0)
fld f20, KVM_ARCH_FP_D_F20(a0)
fld f21, KVM_ARCH_FP_D_F21(a0)
fld f22, KVM_ARCH_FP_D_F22(a0)
fld f23, KVM_ARCH_FP_D_F23(a0)
fld f24, KVM_ARCH_FP_D_F24(a0)
fld f25, KVM_ARCH_FP_D_F25(a0)
fld f26, KVM_ARCH_FP_D_F26(a0)
fld f27, KVM_ARCH_FP_D_F27(a0)
fld f28, KVM_ARCH_FP_D_F28(a0)
fld f29, KVM_ARCH_FP_D_F29(a0)
fld f30, KVM_ARCH_FP_D_F30(a0)
fld f31, KVM_ARCH_FP_D_F31(a0)
fscsr t0
csrw CSR_SSTATUS, t2
ret
#endif

225
arch/riscv/kvm/vcpu_timer.c Normal file
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@ -0,0 +1,225 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Atish Patra <atish.patra@wdc.com>
*/
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/kvm_host.h>
#include <linux/uaccess.h>
#include <clocksource/timer-riscv.h>
#include <asm/csr.h>
#include <asm/delay.h>
#include <asm/kvm_vcpu_timer.h>
static u64 kvm_riscv_current_cycles(struct kvm_guest_timer *gt)
{
return get_cycles64() + gt->time_delta;
}
static u64 kvm_riscv_delta_cycles2ns(u64 cycles,
struct kvm_guest_timer *gt,
struct kvm_vcpu_timer *t)
{
unsigned long flags;
u64 cycles_now, cycles_delta, delta_ns;
local_irq_save(flags);
cycles_now = kvm_riscv_current_cycles(gt);
if (cycles_now < cycles)
cycles_delta = cycles - cycles_now;
else
cycles_delta = 0;
delta_ns = (cycles_delta * gt->nsec_mult) >> gt->nsec_shift;
local_irq_restore(flags);
return delta_ns;
}
static enum hrtimer_restart kvm_riscv_vcpu_hrtimer_expired(struct hrtimer *h)
{
u64 delta_ns;
struct kvm_vcpu_timer *t = container_of(h, struct kvm_vcpu_timer, hrt);
struct kvm_vcpu *vcpu = container_of(t, struct kvm_vcpu, arch.timer);
struct kvm_guest_timer *gt = &vcpu->kvm->arch.timer;
if (kvm_riscv_current_cycles(gt) < t->next_cycles) {
delta_ns = kvm_riscv_delta_cycles2ns(t->next_cycles, gt, t);
hrtimer_forward_now(&t->hrt, ktime_set(0, delta_ns));
return HRTIMER_RESTART;
}
t->next_set = false;
kvm_riscv_vcpu_set_interrupt(vcpu, IRQ_VS_TIMER);
return HRTIMER_NORESTART;
}
static int kvm_riscv_vcpu_timer_cancel(struct kvm_vcpu_timer *t)
{
if (!t->init_done || !t->next_set)
return -EINVAL;
hrtimer_cancel(&t->hrt);
t->next_set = false;
return 0;
}
int kvm_riscv_vcpu_timer_next_event(struct kvm_vcpu *vcpu, u64 ncycles)
{
struct kvm_vcpu_timer *t = &vcpu->arch.timer;
struct kvm_guest_timer *gt = &vcpu->kvm->arch.timer;
u64 delta_ns;
if (!t->init_done)
return -EINVAL;
kvm_riscv_vcpu_unset_interrupt(vcpu, IRQ_VS_TIMER);
delta_ns = kvm_riscv_delta_cycles2ns(ncycles, gt, t);
t->next_cycles = ncycles;
hrtimer_start(&t->hrt, ktime_set(0, delta_ns), HRTIMER_MODE_REL);
t->next_set = true;
return 0;
}
int kvm_riscv_vcpu_get_reg_timer(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg)
{
struct kvm_vcpu_timer *t = &vcpu->arch.timer;
struct kvm_guest_timer *gt = &vcpu->kvm->arch.timer;
u64 __user *uaddr = (u64 __user *)(unsigned long)reg->addr;
unsigned long reg_num = reg->id & ~(KVM_REG_ARCH_MASK |
KVM_REG_SIZE_MASK |
KVM_REG_RISCV_TIMER);
u64 reg_val;
if (KVM_REG_SIZE(reg->id) != sizeof(u64))
return -EINVAL;
if (reg_num >= sizeof(struct kvm_riscv_timer) / sizeof(u64))
return -EINVAL;
switch (reg_num) {
case KVM_REG_RISCV_TIMER_REG(frequency):
reg_val = riscv_timebase;
break;
case KVM_REG_RISCV_TIMER_REG(time):
reg_val = kvm_riscv_current_cycles(gt);
break;
case KVM_REG_RISCV_TIMER_REG(compare):
reg_val = t->next_cycles;
break;
case KVM_REG_RISCV_TIMER_REG(state):
reg_val = (t->next_set) ? KVM_RISCV_TIMER_STATE_ON :
KVM_RISCV_TIMER_STATE_OFF;
break;
default:
return -EINVAL;
};
if (copy_to_user(uaddr, &reg_val, KVM_REG_SIZE(reg->id)))
return -EFAULT;
return 0;
}
int kvm_riscv_vcpu_set_reg_timer(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg)
{
struct kvm_vcpu_timer *t = &vcpu->arch.timer;
struct kvm_guest_timer *gt = &vcpu->kvm->arch.timer;
u64 __user *uaddr = (u64 __user *)(unsigned long)reg->addr;
unsigned long reg_num = reg->id & ~(KVM_REG_ARCH_MASK |
KVM_REG_SIZE_MASK |
KVM_REG_RISCV_TIMER);
u64 reg_val;
int ret = 0;
if (KVM_REG_SIZE(reg->id) != sizeof(u64))
return -EINVAL;
if (reg_num >= sizeof(struct kvm_riscv_timer) / sizeof(u64))
return -EINVAL;
if (copy_from_user(&reg_val, uaddr, KVM_REG_SIZE(reg->id)))
return -EFAULT;
switch (reg_num) {
case KVM_REG_RISCV_TIMER_REG(frequency):
ret = -EOPNOTSUPP;
break;
case KVM_REG_RISCV_TIMER_REG(time):
gt->time_delta = reg_val - get_cycles64();
break;
case KVM_REG_RISCV_TIMER_REG(compare):
t->next_cycles = reg_val;
break;
case KVM_REG_RISCV_TIMER_REG(state):
if (reg_val == KVM_RISCV_TIMER_STATE_ON)
ret = kvm_riscv_vcpu_timer_next_event(vcpu, reg_val);
else
ret = kvm_riscv_vcpu_timer_cancel(t);
break;
default:
ret = -EINVAL;
break;
};
return ret;
}
int kvm_riscv_vcpu_timer_init(struct kvm_vcpu *vcpu)
{
struct kvm_vcpu_timer *t = &vcpu->arch.timer;
if (t->init_done)
return -EINVAL;
hrtimer_init(&t->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
t->hrt.function = kvm_riscv_vcpu_hrtimer_expired;
t->init_done = true;
t->next_set = false;
return 0;
}
int kvm_riscv_vcpu_timer_deinit(struct kvm_vcpu *vcpu)
{
int ret;
ret = kvm_riscv_vcpu_timer_cancel(&vcpu->arch.timer);
vcpu->arch.timer.init_done = false;
return ret;
}
int kvm_riscv_vcpu_timer_reset(struct kvm_vcpu *vcpu)
{
return kvm_riscv_vcpu_timer_cancel(&vcpu->arch.timer);
}
void kvm_riscv_vcpu_timer_restore(struct kvm_vcpu *vcpu)
{
struct kvm_guest_timer *gt = &vcpu->kvm->arch.timer;
#ifdef CONFIG_64BIT
csr_write(CSR_HTIMEDELTA, gt->time_delta);
#else
csr_write(CSR_HTIMEDELTA, (u32)(gt->time_delta));
csr_write(CSR_HTIMEDELTAH, (u32)(gt->time_delta >> 32));
#endif
}
int kvm_riscv_guest_timer_init(struct kvm *kvm)
{
struct kvm_guest_timer *gt = &kvm->arch.timer;
riscv_cs_get_mult_shift(&gt->nsec_mult, &gt->nsec_shift);
gt->time_delta = -get_cycles64();
return 0;
}

97
arch/riscv/kvm/vm.c Normal file
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@ -0,0 +1,97 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/kvm_host.h>
const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
KVM_GENERIC_VM_STATS()
};
static_assert(ARRAY_SIZE(kvm_vm_stats_desc) ==
sizeof(struct kvm_vm_stat) / sizeof(u64));
const struct kvm_stats_header kvm_vm_stats_header = {
.name_size = KVM_STATS_NAME_SIZE,
.num_desc = ARRAY_SIZE(kvm_vm_stats_desc),
.id_offset = sizeof(struct kvm_stats_header),
.desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
.data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
sizeof(kvm_vm_stats_desc),
};
int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
{
int r;
r = kvm_riscv_stage2_alloc_pgd(kvm);
if (r)
return r;
r = kvm_riscv_stage2_vmid_init(kvm);
if (r) {
kvm_riscv_stage2_free_pgd(kvm);
return r;
}
return kvm_riscv_guest_timer_init(kvm);
}
void kvm_arch_destroy_vm(struct kvm *kvm)
{
int i;
for (i = 0; i < KVM_MAX_VCPUS; ++i) {
if (kvm->vcpus[i]) {
kvm_vcpu_destroy(kvm->vcpus[i]);
kvm->vcpus[i] = NULL;
}
}
atomic_set(&kvm->online_vcpus, 0);
}
int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
{
int r;
switch (ext) {
case KVM_CAP_IOEVENTFD:
case KVM_CAP_DEVICE_CTRL:
case KVM_CAP_USER_MEMORY:
case KVM_CAP_SYNC_MMU:
case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
case KVM_CAP_ONE_REG:
case KVM_CAP_READONLY_MEM:
case KVM_CAP_MP_STATE:
case KVM_CAP_IMMEDIATE_EXIT:
r = 1;
break;
case KVM_CAP_NR_VCPUS:
r = num_online_cpus();
break;
case KVM_CAP_MAX_VCPUS:
r = KVM_MAX_VCPUS;
break;
case KVM_CAP_NR_MEMSLOTS:
r = KVM_USER_MEM_SLOTS;
break;
default:
r = 0;
break;
}
return r;
}
long kvm_arch_vm_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
return -EINVAL;
}

120
arch/riscv/kvm/vmid.c Normal file
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@ -0,0 +1,120 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#include <linux/bitops.h>
#include <linux/cpumask.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/kvm_host.h>
#include <asm/csr.h>
#include <asm/sbi.h>
static unsigned long vmid_version = 1;
static unsigned long vmid_next;
static unsigned long vmid_bits;
static DEFINE_SPINLOCK(vmid_lock);
void kvm_riscv_stage2_vmid_detect(void)
{
unsigned long old;
/* Figure-out number of VMID bits in HW */
old = csr_read(CSR_HGATP);
csr_write(CSR_HGATP, old | HGATP_VMID_MASK);
vmid_bits = csr_read(CSR_HGATP);
vmid_bits = (vmid_bits & HGATP_VMID_MASK) >> HGATP_VMID_SHIFT;
vmid_bits = fls_long(vmid_bits);
csr_write(CSR_HGATP, old);
/* We polluted local TLB so flush all guest TLB */
__kvm_riscv_hfence_gvma_all();
/* We don't use VMID bits if they are not sufficient */
if ((1UL << vmid_bits) < num_possible_cpus())
vmid_bits = 0;
}
unsigned long kvm_riscv_stage2_vmid_bits(void)
{
return vmid_bits;
}
int kvm_riscv_stage2_vmid_init(struct kvm *kvm)
{
/* Mark the initial VMID and VMID version invalid */
kvm->arch.vmid.vmid_version = 0;
kvm->arch.vmid.vmid = 0;
return 0;
}
bool kvm_riscv_stage2_vmid_ver_changed(struct kvm_vmid *vmid)
{
if (!vmid_bits)
return false;
return unlikely(READ_ONCE(vmid->vmid_version) !=
READ_ONCE(vmid_version));
}
void kvm_riscv_stage2_vmid_update(struct kvm_vcpu *vcpu)
{
int i;
struct kvm_vcpu *v;
struct cpumask hmask;
struct kvm_vmid *vmid = &vcpu->kvm->arch.vmid;
if (!kvm_riscv_stage2_vmid_ver_changed(vmid))
return;
spin_lock(&vmid_lock);
/*
* We need to re-check the vmid_version here to ensure that if
* another vcpu already allocated a valid vmid for this vm.
*/
if (!kvm_riscv_stage2_vmid_ver_changed(vmid)) {
spin_unlock(&vmid_lock);
return;
}
/* First user of a new VMID version? */
if (unlikely(vmid_next == 0)) {
WRITE_ONCE(vmid_version, READ_ONCE(vmid_version) + 1);
vmid_next = 1;
/*
* We ran out of VMIDs so we increment vmid_version and
* start assigning VMIDs from 1.
*
* This also means existing VMIDs assignement to all Guest
* instances is invalid and we have force VMID re-assignement
* for all Guest instances. The Guest instances that were not
* running will automatically pick-up new VMIDs because will
* call kvm_riscv_stage2_vmid_update() whenever they enter
* in-kernel run loop. For Guest instances that are already
* running, we force VM exits on all host CPUs using IPI and
* flush all Guest TLBs.
*/
riscv_cpuid_to_hartid_mask(cpu_online_mask, &hmask);
sbi_remote_hfence_gvma(cpumask_bits(&hmask), 0, 0);
}
vmid->vmid = vmid_next;
vmid_next++;
vmid_next &= (1 << vmid_bits) - 1;
WRITE_ONCE(vmid->vmid_version, READ_ONCE(vmid_version));
spin_unlock(&vmid_lock);
/* Request stage2 page table update for all VCPUs */
kvm_for_each_vcpu(i, v, vcpu->kvm)
kvm_make_request(KVM_REQ_UPDATE_HGATP, v);
}

12
arch/s390/kvm/gaccess.c
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@ -894,6 +894,11 @@ int access_guest_real(struct kvm_vcpu *vcpu, unsigned long gra,
/**
* guest_translate_address - translate guest logical into guest absolute address
* @vcpu: virtual cpu
* @gva: Guest virtual address
* @ar: Access register
* @gpa: Guest physical address
* @mode: Translation access mode
*
* Parameter semantics are the same as the ones from guest_translate.
* The memory contents at the guest address are not changed.
@ -934,6 +939,11 @@ int guest_translate_address(struct kvm_vcpu *vcpu, unsigned long gva, u8 ar,
/**
* check_gva_range - test a range of guest virtual addresses for accessibility
* @vcpu: virtual cpu
* @gva: Guest virtual address
* @ar: Access register
* @length: Length of test range
* @mode: Translation access mode
*/
int check_gva_range(struct kvm_vcpu *vcpu, unsigned long gva, u8 ar,
unsigned long length, enum gacc_mode mode)
@ -956,6 +966,7 @@ int check_gva_range(struct kvm_vcpu *vcpu, unsigned long gva, u8 ar,
/**
* kvm_s390_check_low_addr_prot_real - check for low-address protection
* @vcpu: virtual cpu
* @gra: Guest real address
*
* Checks whether an address is subject to low-address protection and set
@ -979,6 +990,7 @@ int kvm_s390_check_low_addr_prot_real(struct kvm_vcpu *vcpu, unsigned long gra)
* @pgt: pointer to the beginning of the page table for the given address if
* successful (return value 0), or to the first invalid DAT entry in
* case of exceptions (return value > 0)
* @dat_protection: referenced memory is write protected
* @fake: pgt references contiguous guest memory block, not a pgtable
*/
static int kvm_s390_shadow_tables(struct gmap *sg, unsigned long saddr,

4
arch/s390/kvm/intercept.c
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@ -269,6 +269,7 @@ static int handle_prog(struct kvm_vcpu *vcpu)
/**
* handle_external_interrupt - used for external interruption interceptions
* @vcpu: virtual cpu
*
* This interception only occurs if the CPUSTAT_EXT_INT bit was set, or if
* the new PSW does not have external interrupts disabled. In the first case,
@ -315,7 +316,8 @@ static int handle_external_interrupt(struct kvm_vcpu *vcpu)
}
/**
* Handle MOVE PAGE partial execution interception.
* handle_mvpg_pei - Handle MOVE PAGE partial execution interception.
* @vcpu: virtual cpu
*
* This interception can only happen for guests with DAT disabled and
* addresses that are currently not mapped in the host. Thus we try to

9
drivers/clocksource/timer-riscv.c
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@ -13,10 +13,12 @@
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/module.h>
#include <linux/sched_clock.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include <linux/interrupt.h>
#include <linux/of_irq.h>
#include <clocksource/timer-riscv.h>
#include <asm/smp.h>
#include <asm/sbi.h>
#include <asm/timex.h>
@ -79,6 +81,13 @@ static int riscv_timer_dying_cpu(unsigned int cpu)
return 0;
}
void riscv_cs_get_mult_shift(u32 *mult, u32 *shift)
{
*mult = riscv_clocksource.mult;
*shift = riscv_clocksource.shift;
}
EXPORT_SYMBOL_GPL(riscv_cs_get_mult_shift);
/* called directly from the low-level interrupt handler */
static irqreturn_t riscv_timer_interrupt(int irq, void *dev_id)
{

16
include/clocksource/timer-riscv.h Normal file
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@ -0,0 +1,16 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Atish Patra <atish.patra@wdc.com>
*/
#ifndef __TIMER_RISCV_H
#define __TIMER_RISCV_H
#include <linux/types.h>
extern void riscv_cs_get_mult_shift(u32 *mult, u32 *shift);
#endif

8
include/uapi/linux/kvm.h
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@ -269,6 +269,7 @@ struct kvm_xen_exit {
#define KVM_EXIT_AP_RESET_HOLD 32
#define KVM_EXIT_X86_BUS_LOCK 33
#define KVM_EXIT_XEN 34
#define KVM_EXIT_RISCV_SBI 35
/* For KVM_EXIT_INTERNAL_ERROR */
/* Emulate instruction failed. */
@ -469,6 +470,13 @@ struct kvm_run {
} msr;
/* KVM_EXIT_XEN */
struct kvm_xen_exit xen;
/* KVM_EXIT_RISCV_SBI */
struct {
unsigned long extension_id;
unsigned long function_id;
unsigned long args[6];
unsigned long ret[2];
} riscv_sbi;
/* Fix the size of the union. */
char padding[256];
};