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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/arch/powerpc/kvm/booke_interrupts.S

433 строки
11 KiB
ArmAsm
Исходник Обычный вид История

KVM: ppc: PowerPC 440 KVM implementation This functionality is definitely experimental, but is capable of running unmodified PowerPC 440 Linux kernels as guests on a PowerPC 440 host. (Only tested with 440EP "Bamboo" guests so far, but with appropriate userspace support other SoC/board combinations should work.) See Documentation/powerpc/kvm_440.txt for technical details. [stephen: build fix] Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-04-17 08:28:09 +04:00
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright IBM Corp. 2007
*
* Authors: Hollis Blanchard <hollisb@us.ibm.com>
*/
#include <asm/ppc_asm.h>
#include <asm/kvm_asm.h>
#include <asm/reg.h>
#include <asm/mmu-44x.h>
#include <asm/page.h>
#include <asm/asm-offsets.h>
#define KVMPPC_MSR_MASK (MSR_CE|MSR_EE|MSR_PR|MSR_DE|MSR_ME|MSR_IS|MSR_DS)
#define VCPU_GPR(n) (VCPU_GPRS + (n * 4))
/* The host stack layout: */
#define HOST_R1 0 /* Implied by stwu. */
#define HOST_CALLEE_LR 4
#define HOST_RUN 8
/* r2 is special: it holds 'current', and it made nonvolatile in the
* kernel with the -ffixed-r2 gcc option. */
#define HOST_R2 12
#define HOST_NV_GPRS 16
#define HOST_NV_GPR(n) (HOST_NV_GPRS + ((n - 14) * 4))
#define HOST_MIN_STACK_SIZE (HOST_NV_GPR(31) + 4)
#define HOST_STACK_SIZE (((HOST_MIN_STACK_SIZE + 15) / 16) * 16) /* Align. */
#define HOST_STACK_LR (HOST_STACK_SIZE + 4) /* In caller stack frame. */
#define NEED_INST_MASK ((1<<BOOKE_INTERRUPT_PROGRAM) | \
KVM: ppc: guest breakpoint support Allow host userspace to program hardware debug registers to set breakpoints inside guests. Signed-off-by: Jerone Young <jyoung5@us.ibm.com> Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-07-25 22:54:49 +04:00
(1<<BOOKE_INTERRUPT_DTLB_MISS) | \
(1<<BOOKE_INTERRUPT_DEBUG))
KVM: ppc: PowerPC 440 KVM implementation This functionality is definitely experimental, but is capable of running unmodified PowerPC 440 Linux kernels as guests on a PowerPC 440 host. (Only tested with 440EP "Bamboo" guests so far, but with appropriate userspace support other SoC/board combinations should work.) See Documentation/powerpc/kvm_440.txt for technical details. [stephen: build fix] Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-04-17 08:28:09 +04:00
#define NEED_DEAR_MASK ((1<<BOOKE_INTERRUPT_DATA_STORAGE) | \
(1<<BOOKE_INTERRUPT_DTLB_MISS))
#define NEED_ESR_MASK ((1<<BOOKE_INTERRUPT_DATA_STORAGE) | \
(1<<BOOKE_INTERRUPT_INST_STORAGE) | \
(1<<BOOKE_INTERRUPT_PROGRAM) | \
(1<<BOOKE_INTERRUPT_DTLB_MISS))
.macro KVM_HANDLER ivor_nr
_GLOBAL(kvmppc_handler_\ivor_nr)
/* Get pointer to vcpu and record exit number. */
powerpc: Use names rather than numbers for SPRGs (v2) The kernel uses SPRG registers for various purposes, typically in low level assembly code as scratch registers or to hold per-cpu global infos such as the PACA or the current thread_info pointer. We want to be able to easily shuffle the usage of those registers as some implementations have specific constraints realted to some of them, for example, some have userspace readable aliases, etc.. and the current choice isn't always the best. This patch should not change any code generation, and replaces the usage of SPRN_SPRGn everywhere in the kernel with a named replacement and adds documentation next to the definition of the names as to what those are used for on each processor family. The only parts that still use the original numbers are bits of KVM or suspend/resume code that just blindly needs to save/restore all the SPRGs. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-07-15 00:52:54 +04:00
mtspr SPRN_SPRG_WSCRATCH0, r4
mfspr r4, SPRN_SPRG_RVCPU
KVM: ppc: PowerPC 440 KVM implementation This functionality is definitely experimental, but is capable of running unmodified PowerPC 440 Linux kernels as guests on a PowerPC 440 host. (Only tested with 440EP "Bamboo" guests so far, but with appropriate userspace support other SoC/board combinations should work.) See Documentation/powerpc/kvm_440.txt for technical details. [stephen: build fix] Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-04-17 08:28:09 +04:00
stw r5, VCPU_GPR(r5)(r4)
stw r6, VCPU_GPR(r6)(r4)
mfctr r5
lis r6, kvmppc_resume_host@h
stw r5, VCPU_CTR(r4)
li r5, \ivor_nr
ori r6, r6, kvmppc_resume_host@l
mtctr r6
bctr
.endm
_GLOBAL(kvmppc_handlers_start)
KVM_HANDLER BOOKE_INTERRUPT_CRITICAL
KVM_HANDLER BOOKE_INTERRUPT_MACHINE_CHECK
KVM_HANDLER BOOKE_INTERRUPT_DATA_STORAGE
KVM_HANDLER BOOKE_INTERRUPT_INST_STORAGE
KVM_HANDLER BOOKE_INTERRUPT_EXTERNAL
KVM_HANDLER BOOKE_INTERRUPT_ALIGNMENT
KVM_HANDLER BOOKE_INTERRUPT_PROGRAM
KVM_HANDLER BOOKE_INTERRUPT_FP_UNAVAIL
KVM_HANDLER BOOKE_INTERRUPT_SYSCALL
KVM_HANDLER BOOKE_INTERRUPT_AP_UNAVAIL
KVM_HANDLER BOOKE_INTERRUPT_DECREMENTER
KVM_HANDLER BOOKE_INTERRUPT_FIT
KVM_HANDLER BOOKE_INTERRUPT_WATCHDOG
KVM_HANDLER BOOKE_INTERRUPT_DTLB_MISS
KVM_HANDLER BOOKE_INTERRUPT_ITLB_MISS
KVM_HANDLER BOOKE_INTERRUPT_DEBUG
KVM: ppc: Add extra E500 exceptions e500 has additional interrupt vectors (and corresponding IVORs) for SPE and performance monitoring interrupts. Signed-off-by: Liu Yu <yu.liu@freescale.com> Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-01-04 01:23:13 +03:00
KVM_HANDLER BOOKE_INTERRUPT_SPE_UNAVAIL
KVM_HANDLER BOOKE_INTERRUPT_SPE_FP_DATA
KVM_HANDLER BOOKE_INTERRUPT_SPE_FP_ROUND
KVM: ppc: PowerPC 440 KVM implementation This functionality is definitely experimental, but is capable of running unmodified PowerPC 440 Linux kernels as guests on a PowerPC 440 host. (Only tested with 440EP "Bamboo" guests so far, but with appropriate userspace support other SoC/board combinations should work.) See Documentation/powerpc/kvm_440.txt for technical details. [stephen: build fix] Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-04-17 08:28:09 +04:00
_GLOBAL(kvmppc_handler_len)
.long kvmppc_handler_1 - kvmppc_handler_0
/* Registers:
powerpc: Use names rather than numbers for SPRGs (v2) The kernel uses SPRG registers for various purposes, typically in low level assembly code as scratch registers or to hold per-cpu global infos such as the PACA or the current thread_info pointer. We want to be able to easily shuffle the usage of those registers as some implementations have specific constraints realted to some of them, for example, some have userspace readable aliases, etc.. and the current choice isn't always the best. This patch should not change any code generation, and replaces the usage of SPRN_SPRGn everywhere in the kernel with a named replacement and adds documentation next to the definition of the names as to what those are used for on each processor family. The only parts that still use the original numbers are bits of KVM or suspend/resume code that just blindly needs to save/restore all the SPRGs. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-07-15 00:52:54 +04:00
* SPRG_SCRATCH0: guest r4
KVM: ppc: PowerPC 440 KVM implementation This functionality is definitely experimental, but is capable of running unmodified PowerPC 440 Linux kernels as guests on a PowerPC 440 host. (Only tested with 440EP "Bamboo" guests so far, but with appropriate userspace support other SoC/board combinations should work.) See Documentation/powerpc/kvm_440.txt for technical details. [stephen: build fix] Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-04-17 08:28:09 +04:00
* r4: vcpu pointer
* r5: KVM exit number
*/
_GLOBAL(kvmppc_resume_host)
stw r3, VCPU_GPR(r3)(r4)
mfcr r3
stw r3, VCPU_CR(r4)
stw r7, VCPU_GPR(r7)(r4)
stw r8, VCPU_GPR(r8)(r4)
stw r9, VCPU_GPR(r9)(r4)
li r6, 1
slw r6, r6, r5
KVM: ppc: Implement in-kernel exit timing statistics Existing KVM statistics are either just counters (kvm_stat) reported for KVM generally or trace based aproaches like kvm_trace. For KVM on powerpc we had the need to track the timings of the different exit types. While this could be achieved parsing data created with a kvm_trace extension this adds too much overhead (at least on embedded PowerPC) slowing down the workloads we wanted to measure. Therefore this patch adds a in-kernel exit timing statistic to the powerpc kvm code. These statistic is available per vm&vcpu under the kvm debugfs directory. As this statistic is low, but still some overhead it can be enabled via a .config entry and should be off by default. Since this patch touched all powerpc kvm_stat code anyway this code is now merged and simplified together with the exit timing statistic code (still working with exit timing disabled in .config). Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-03 00:51:57 +03:00
#ifdef CONFIG_KVM_EXIT_TIMING
/* save exit time */
1:
mfspr r7, SPRN_TBRU
mfspr r8, SPRN_TBRL
mfspr r9, SPRN_TBRU
cmpw r9, r7
bne 1b
stw r8, VCPU_TIMING_EXIT_TBL(r4)
stw r9, VCPU_TIMING_EXIT_TBU(r4)
#endif
KVM: ppc: PowerPC 440 KVM implementation This functionality is definitely experimental, but is capable of running unmodified PowerPC 440 Linux kernels as guests on a PowerPC 440 host. (Only tested with 440EP "Bamboo" guests so far, but with appropriate userspace support other SoC/board combinations should work.) See Documentation/powerpc/kvm_440.txt for technical details. [stephen: build fix] Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-04-17 08:28:09 +04:00
/* Save the faulting instruction and all GPRs for emulation. */
andi. r7, r6, NEED_INST_MASK
beq ..skip_inst_copy
mfspr r9, SPRN_SRR0
mfmsr r8
ori r7, r8, MSR_DS
mtmsr r7
isync
lwz r9, 0(r9)
mtmsr r8
isync
stw r9, VCPU_LAST_INST(r4)
stw r15, VCPU_GPR(r15)(r4)
stw r16, VCPU_GPR(r16)(r4)
stw r17, VCPU_GPR(r17)(r4)
stw r18, VCPU_GPR(r18)(r4)
stw r19, VCPU_GPR(r19)(r4)
stw r20, VCPU_GPR(r20)(r4)
stw r21, VCPU_GPR(r21)(r4)
stw r22, VCPU_GPR(r22)(r4)
stw r23, VCPU_GPR(r23)(r4)
stw r24, VCPU_GPR(r24)(r4)
stw r25, VCPU_GPR(r25)(r4)
stw r26, VCPU_GPR(r26)(r4)
stw r27, VCPU_GPR(r27)(r4)
stw r28, VCPU_GPR(r28)(r4)
stw r29, VCPU_GPR(r29)(r4)
stw r30, VCPU_GPR(r30)(r4)
stw r31, VCPU_GPR(r31)(r4)
..skip_inst_copy:
/* Also grab DEAR and ESR before the host can clobber them. */
andi. r7, r6, NEED_DEAR_MASK
beq ..skip_dear
mfspr r9, SPRN_DEAR
stw r9, VCPU_FAULT_DEAR(r4)
..skip_dear:
andi. r7, r6, NEED_ESR_MASK
beq ..skip_esr
mfspr r9, SPRN_ESR
stw r9, VCPU_FAULT_ESR(r4)
..skip_esr:
/* Save remaining volatile guest register state to vcpu. */
stw r0, VCPU_GPR(r0)(r4)
stw r1, VCPU_GPR(r1)(r4)
stw r2, VCPU_GPR(r2)(r4)
stw r10, VCPU_GPR(r10)(r4)
stw r11, VCPU_GPR(r11)(r4)
stw r12, VCPU_GPR(r12)(r4)
stw r13, VCPU_GPR(r13)(r4)
stw r14, VCPU_GPR(r14)(r4) /* We need a NV GPR below. */
mflr r3
stw r3, VCPU_LR(r4)
mfxer r3
stw r3, VCPU_XER(r4)
powerpc: Use names rather than numbers for SPRGs (v2) The kernel uses SPRG registers for various purposes, typically in low level assembly code as scratch registers or to hold per-cpu global infos such as the PACA or the current thread_info pointer. We want to be able to easily shuffle the usage of those registers as some implementations have specific constraints realted to some of them, for example, some have userspace readable aliases, etc.. and the current choice isn't always the best. This patch should not change any code generation, and replaces the usage of SPRN_SPRGn everywhere in the kernel with a named replacement and adds documentation next to the definition of the names as to what those are used for on each processor family. The only parts that still use the original numbers are bits of KVM or suspend/resume code that just blindly needs to save/restore all the SPRGs. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-07-15 00:52:54 +04:00
mfspr r3, SPRN_SPRG_RSCRATCH0
KVM: ppc: PowerPC 440 KVM implementation This functionality is definitely experimental, but is capable of running unmodified PowerPC 440 Linux kernels as guests on a PowerPC 440 host. (Only tested with 440EP "Bamboo" guests so far, but with appropriate userspace support other SoC/board combinations should work.) See Documentation/powerpc/kvm_440.txt for technical details. [stephen: build fix] Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-04-17 08:28:09 +04:00
stw r3, VCPU_GPR(r4)(r4)
mfspr r3, SPRN_SRR0
stw r3, VCPU_PC(r4)
/* Restore host stack pointer and PID before IVPR, since the host
* exception handlers use them. */
lwz r1, VCPU_HOST_STACK(r4)
lwz r3, VCPU_HOST_PID(r4)
mtspr SPRN_PID, r3
/* Restore host IVPR before re-enabling interrupts. We cheat and know
* that Linux IVPR is always 0xc0000000. */
lis r3, 0xc000
mtspr SPRN_IVPR, r3
/* Switch to kernel stack and jump to handler. */
LOAD_REG_ADDR(r3, kvmppc_handle_exit)
mtctr r3
lwz r3, HOST_RUN(r1)
lwz r2, HOST_R2(r1)
mr r14, r4 /* Save vcpu pointer. */
bctrl /* kvmppc_handle_exit() */
/* Restore vcpu pointer and the nonvolatiles we used. */
mr r4, r14
lwz r14, VCPU_GPR(r14)(r4)
/* Sometimes instruction emulation must restore complete GPR state. */
andi. r5, r3, RESUME_FLAG_NV
beq ..skip_nv_load
lwz r15, VCPU_GPR(r15)(r4)
lwz r16, VCPU_GPR(r16)(r4)
lwz r17, VCPU_GPR(r17)(r4)
lwz r18, VCPU_GPR(r18)(r4)
lwz r19, VCPU_GPR(r19)(r4)
lwz r20, VCPU_GPR(r20)(r4)
lwz r21, VCPU_GPR(r21)(r4)
lwz r22, VCPU_GPR(r22)(r4)
lwz r23, VCPU_GPR(r23)(r4)
lwz r24, VCPU_GPR(r24)(r4)
lwz r25, VCPU_GPR(r25)(r4)
lwz r26, VCPU_GPR(r26)(r4)
lwz r27, VCPU_GPR(r27)(r4)
lwz r28, VCPU_GPR(r28)(r4)
lwz r29, VCPU_GPR(r29)(r4)
lwz r30, VCPU_GPR(r30)(r4)
lwz r31, VCPU_GPR(r31)(r4)
..skip_nv_load:
/* Should we return to the guest? */
andi. r5, r3, RESUME_FLAG_HOST
beq lightweight_exit
srawi r3, r3, 2 /* Shift -ERR back down. */
heavyweight_exit:
/* Not returning to guest. */
/* We already saved guest volatile register state; now save the
* non-volatiles. */
stw r15, VCPU_GPR(r15)(r4)
stw r16, VCPU_GPR(r16)(r4)
stw r17, VCPU_GPR(r17)(r4)
stw r18, VCPU_GPR(r18)(r4)
stw r19, VCPU_GPR(r19)(r4)
stw r20, VCPU_GPR(r20)(r4)
stw r21, VCPU_GPR(r21)(r4)
stw r22, VCPU_GPR(r22)(r4)
stw r23, VCPU_GPR(r23)(r4)
stw r24, VCPU_GPR(r24)(r4)
stw r25, VCPU_GPR(r25)(r4)
stw r26, VCPU_GPR(r26)(r4)
stw r27, VCPU_GPR(r27)(r4)
stw r28, VCPU_GPR(r28)(r4)
stw r29, VCPU_GPR(r29)(r4)
stw r30, VCPU_GPR(r30)(r4)
stw r31, VCPU_GPR(r31)(r4)
/* Load host non-volatile register state from host stack. */
lwz r14, HOST_NV_GPR(r14)(r1)
lwz r15, HOST_NV_GPR(r15)(r1)
lwz r16, HOST_NV_GPR(r16)(r1)
lwz r17, HOST_NV_GPR(r17)(r1)
lwz r18, HOST_NV_GPR(r18)(r1)
lwz r19, HOST_NV_GPR(r19)(r1)
lwz r20, HOST_NV_GPR(r20)(r1)
lwz r21, HOST_NV_GPR(r21)(r1)
lwz r22, HOST_NV_GPR(r22)(r1)
lwz r23, HOST_NV_GPR(r23)(r1)
lwz r24, HOST_NV_GPR(r24)(r1)
lwz r25, HOST_NV_GPR(r25)(r1)
lwz r26, HOST_NV_GPR(r26)(r1)
lwz r27, HOST_NV_GPR(r27)(r1)
lwz r28, HOST_NV_GPR(r28)(r1)
lwz r29, HOST_NV_GPR(r29)(r1)
lwz r30, HOST_NV_GPR(r30)(r1)
lwz r31, HOST_NV_GPR(r31)(r1)
/* Return to kvm_vcpu_run(). */
lwz r4, HOST_STACK_LR(r1)
addi r1, r1, HOST_STACK_SIZE
mtlr r4
/* r3 still contains the return code from kvmppc_handle_exit(). */
blr
/* Registers:
* r3: kvm_run pointer
* r4: vcpu pointer
*/
_GLOBAL(__kvmppc_vcpu_run)
stwu r1, -HOST_STACK_SIZE(r1)
stw r1, VCPU_HOST_STACK(r4) /* Save stack pointer to vcpu. */
/* Save host state to stack. */
stw r3, HOST_RUN(r1)
mflr r3
stw r3, HOST_STACK_LR(r1)
/* Save host non-volatile register state to stack. */
stw r14, HOST_NV_GPR(r14)(r1)
stw r15, HOST_NV_GPR(r15)(r1)
stw r16, HOST_NV_GPR(r16)(r1)
stw r17, HOST_NV_GPR(r17)(r1)
stw r18, HOST_NV_GPR(r18)(r1)
stw r19, HOST_NV_GPR(r19)(r1)
stw r20, HOST_NV_GPR(r20)(r1)
stw r21, HOST_NV_GPR(r21)(r1)
stw r22, HOST_NV_GPR(r22)(r1)
stw r23, HOST_NV_GPR(r23)(r1)
stw r24, HOST_NV_GPR(r24)(r1)
stw r25, HOST_NV_GPR(r25)(r1)
stw r26, HOST_NV_GPR(r26)(r1)
stw r27, HOST_NV_GPR(r27)(r1)
stw r28, HOST_NV_GPR(r28)(r1)
stw r29, HOST_NV_GPR(r29)(r1)
stw r30, HOST_NV_GPR(r30)(r1)
stw r31, HOST_NV_GPR(r31)(r1)
/* Load guest non-volatiles. */
lwz r14, VCPU_GPR(r14)(r4)
lwz r15, VCPU_GPR(r15)(r4)
lwz r16, VCPU_GPR(r16)(r4)
lwz r17, VCPU_GPR(r17)(r4)
lwz r18, VCPU_GPR(r18)(r4)
lwz r19, VCPU_GPR(r19)(r4)
lwz r20, VCPU_GPR(r20)(r4)
lwz r21, VCPU_GPR(r21)(r4)
lwz r22, VCPU_GPR(r22)(r4)
lwz r23, VCPU_GPR(r23)(r4)
lwz r24, VCPU_GPR(r24)(r4)
lwz r25, VCPU_GPR(r25)(r4)
lwz r26, VCPU_GPR(r26)(r4)
lwz r27, VCPU_GPR(r27)(r4)
lwz r28, VCPU_GPR(r28)(r4)
lwz r29, VCPU_GPR(r29)(r4)
lwz r30, VCPU_GPR(r30)(r4)
lwz r31, VCPU_GPR(r31)(r4)
lightweight_exit:
stw r2, HOST_R2(r1)
mfspr r3, SPRN_PID
stw r3, VCPU_HOST_PID(r4)
KVM: powerpc: Map guest userspace with TID=0 mappings When we use TID=N userspace mappings, we must ensure that kernel mappings have been destroyed when entering userspace. Using TID=1/TID=0 for kernel/user mappings and running userspace with PID=0 means that userspace can't access the kernel mappings, but the kernel can directly access userspace. The net is that we don't need to flush the TLB on privilege switches, but we do on guest context switches (which are far more infrequent). Guest boot time performance improvement: about 30%. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-07-25 22:54:53 +04:00
lwz r3, VCPU_SHADOW_PID(r4)
KVM: ppc: PowerPC 440 KVM implementation This functionality is definitely experimental, but is capable of running unmodified PowerPC 440 Linux kernels as guests on a PowerPC 440 host. (Only tested with 440EP "Bamboo" guests so far, but with appropriate userspace support other SoC/board combinations should work.) See Documentation/powerpc/kvm_440.txt for technical details. [stephen: build fix] Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-04-17 08:28:09 +04:00
mtspr SPRN_PID, r3
KVM: ppc: ifdef iccci with CONFIG_44x E500 deosn't support this instruction. Signed-off-by: Liu Yu <yu.liu@freescale.com> Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-01-04 01:23:09 +03:00
#ifdef CONFIG_44x
KVM: ppc: PowerPC 440 KVM implementation This functionality is definitely experimental, but is capable of running unmodified PowerPC 440 Linux kernels as guests on a PowerPC 440 host. (Only tested with 440EP "Bamboo" guests so far, but with appropriate userspace support other SoC/board combinations should work.) See Documentation/powerpc/kvm_440.txt for technical details. [stephen: build fix] Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-04-17 08:28:09 +04:00
iccci 0, 0 /* XXX hack */
KVM: ppc: ifdef iccci with CONFIG_44x E500 deosn't support this instruction. Signed-off-by: Liu Yu <yu.liu@freescale.com> Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-01-04 01:23:09 +03:00
#endif
KVM: ppc: PowerPC 440 KVM implementation This functionality is definitely experimental, but is capable of running unmodified PowerPC 440 Linux kernels as guests on a PowerPC 440 host. (Only tested with 440EP "Bamboo" guests so far, but with appropriate userspace support other SoC/board combinations should work.) See Documentation/powerpc/kvm_440.txt for technical details. [stephen: build fix] Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-04-17 08:28:09 +04:00
/* Load some guest volatiles. */
lwz r0, VCPU_GPR(r0)(r4)
lwz r2, VCPU_GPR(r2)(r4)
lwz r9, VCPU_GPR(r9)(r4)
lwz r10, VCPU_GPR(r10)(r4)
lwz r11, VCPU_GPR(r11)(r4)
lwz r12, VCPU_GPR(r12)(r4)
lwz r13, VCPU_GPR(r13)(r4)
lwz r3, VCPU_LR(r4)
mtlr r3
lwz r3, VCPU_XER(r4)
mtxer r3
/* Switch the IVPR. XXX If we take a TLB miss after this we're screwed,
* so how do we make sure vcpu won't fault? */
lis r8, kvmppc_booke_handlers@ha
lwz r8, kvmppc_booke_handlers@l(r8)
mtspr SPRN_IVPR, r8
/* Save vcpu pointer for the exception handlers. */
powerpc: Use names rather than numbers for SPRGs (v2) The kernel uses SPRG registers for various purposes, typically in low level assembly code as scratch registers or to hold per-cpu global infos such as the PACA or the current thread_info pointer. We want to be able to easily shuffle the usage of those registers as some implementations have specific constraints realted to some of them, for example, some have userspace readable aliases, etc.. and the current choice isn't always the best. This patch should not change any code generation, and replaces the usage of SPRN_SPRGn everywhere in the kernel with a named replacement and adds documentation next to the definition of the names as to what those are used for on each processor family. The only parts that still use the original numbers are bits of KVM or suspend/resume code that just blindly needs to save/restore all the SPRGs. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-07-15 00:52:54 +04:00
mtspr SPRN_SPRG_WVCPU, r4
KVM: ppc: PowerPC 440 KVM implementation This functionality is definitely experimental, but is capable of running unmodified PowerPC 440 Linux kernels as guests on a PowerPC 440 host. (Only tested with 440EP "Bamboo" guests so far, but with appropriate userspace support other SoC/board combinations should work.) See Documentation/powerpc/kvm_440.txt for technical details. [stephen: build fix] Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-04-17 08:28:09 +04:00
/* Can't switch the stack pointer until after IVPR is switched,
* because host interrupt handlers would get confused. */
lwz r1, VCPU_GPR(r1)(r4)
/* XXX handle USPRG0 */
/* Host interrupt handlers may have clobbered these guest-readable
* SPRGs, so we need to reload them here with the guest's values. */
lwz r3, VCPU_SPRG4(r4)
powerpc: Use names rather than numbers for SPRGs (v2) The kernel uses SPRG registers for various purposes, typically in low level assembly code as scratch registers or to hold per-cpu global infos such as the PACA or the current thread_info pointer. We want to be able to easily shuffle the usage of those registers as some implementations have specific constraints realted to some of them, for example, some have userspace readable aliases, etc.. and the current choice isn't always the best. This patch should not change any code generation, and replaces the usage of SPRN_SPRGn everywhere in the kernel with a named replacement and adds documentation next to the definition of the names as to what those are used for on each processor family. The only parts that still use the original numbers are bits of KVM or suspend/resume code that just blindly needs to save/restore all the SPRGs. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-07-15 00:52:54 +04:00
mtspr SPRN_SPRG4W, r3
KVM: ppc: PowerPC 440 KVM implementation This functionality is definitely experimental, but is capable of running unmodified PowerPC 440 Linux kernels as guests on a PowerPC 440 host. (Only tested with 440EP "Bamboo" guests so far, but with appropriate userspace support other SoC/board combinations should work.) See Documentation/powerpc/kvm_440.txt for technical details. [stephen: build fix] Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-04-17 08:28:09 +04:00
lwz r3, VCPU_SPRG5(r4)
powerpc: Use names rather than numbers for SPRGs (v2) The kernel uses SPRG registers for various purposes, typically in low level assembly code as scratch registers or to hold per-cpu global infos such as the PACA or the current thread_info pointer. We want to be able to easily shuffle the usage of those registers as some implementations have specific constraints realted to some of them, for example, some have userspace readable aliases, etc.. and the current choice isn't always the best. This patch should not change any code generation, and replaces the usage of SPRN_SPRGn everywhere in the kernel with a named replacement and adds documentation next to the definition of the names as to what those are used for on each processor family. The only parts that still use the original numbers are bits of KVM or suspend/resume code that just blindly needs to save/restore all the SPRGs. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-07-15 00:52:54 +04:00
mtspr SPRN_SPRG5W, r3
KVM: ppc: PowerPC 440 KVM implementation This functionality is definitely experimental, but is capable of running unmodified PowerPC 440 Linux kernels as guests on a PowerPC 440 host. (Only tested with 440EP "Bamboo" guests so far, but with appropriate userspace support other SoC/board combinations should work.) See Documentation/powerpc/kvm_440.txt for technical details. [stephen: build fix] Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-04-17 08:28:09 +04:00
lwz r3, VCPU_SPRG6(r4)
powerpc: Use names rather than numbers for SPRGs (v2) The kernel uses SPRG registers for various purposes, typically in low level assembly code as scratch registers or to hold per-cpu global infos such as the PACA or the current thread_info pointer. We want to be able to easily shuffle the usage of those registers as some implementations have specific constraints realted to some of them, for example, some have userspace readable aliases, etc.. and the current choice isn't always the best. This patch should not change any code generation, and replaces the usage of SPRN_SPRGn everywhere in the kernel with a named replacement and adds documentation next to the definition of the names as to what those are used for on each processor family. The only parts that still use the original numbers are bits of KVM or suspend/resume code that just blindly needs to save/restore all the SPRGs. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-07-15 00:52:54 +04:00
mtspr SPRN_SPRG6W, r3
KVM: ppc: PowerPC 440 KVM implementation This functionality is definitely experimental, but is capable of running unmodified PowerPC 440 Linux kernels as guests on a PowerPC 440 host. (Only tested with 440EP "Bamboo" guests so far, but with appropriate userspace support other SoC/board combinations should work.) See Documentation/powerpc/kvm_440.txt for technical details. [stephen: build fix] Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-04-17 08:28:09 +04:00
lwz r3, VCPU_SPRG7(r4)
powerpc: Use names rather than numbers for SPRGs (v2) The kernel uses SPRG registers for various purposes, typically in low level assembly code as scratch registers or to hold per-cpu global infos such as the PACA or the current thread_info pointer. We want to be able to easily shuffle the usage of those registers as some implementations have specific constraints realted to some of them, for example, some have userspace readable aliases, etc.. and the current choice isn't always the best. This patch should not change any code generation, and replaces the usage of SPRN_SPRGn everywhere in the kernel with a named replacement and adds documentation next to the definition of the names as to what those are used for on each processor family. The only parts that still use the original numbers are bits of KVM or suspend/resume code that just blindly needs to save/restore all the SPRGs. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-07-15 00:52:54 +04:00
mtspr SPRN_SPRG7W, r3
KVM: ppc: PowerPC 440 KVM implementation This functionality is definitely experimental, but is capable of running unmodified PowerPC 440 Linux kernels as guests on a PowerPC 440 host. (Only tested with 440EP "Bamboo" guests so far, but with appropriate userspace support other SoC/board combinations should work.) See Documentation/powerpc/kvm_440.txt for technical details. [stephen: build fix] Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-04-17 08:28:09 +04:00
KVM: ppc: Implement in-kernel exit timing statistics Existing KVM statistics are either just counters (kvm_stat) reported for KVM generally or trace based aproaches like kvm_trace. For KVM on powerpc we had the need to track the timings of the different exit types. While this could be achieved parsing data created with a kvm_trace extension this adds too much overhead (at least on embedded PowerPC) slowing down the workloads we wanted to measure. Therefore this patch adds a in-kernel exit timing statistic to the powerpc kvm code. These statistic is available per vm&vcpu under the kvm debugfs directory. As this statistic is low, but still some overhead it can be enabled via a .config entry and should be off by default. Since this patch touched all powerpc kvm_stat code anyway this code is now merged and simplified together with the exit timing statistic code (still working with exit timing disabled in .config). Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-03 00:51:57 +03:00
#ifdef CONFIG_KVM_EXIT_TIMING
/* save enter time */
1:
mfspr r6, SPRN_TBRU
mfspr r7, SPRN_TBRL
mfspr r8, SPRN_TBRU
cmpw r8, r6
bne 1b
stw r7, VCPU_TIMING_LAST_ENTER_TBL(r4)
stw r8, VCPU_TIMING_LAST_ENTER_TBU(r4)
#endif
KVM: ppc: PowerPC 440 KVM implementation This functionality is definitely experimental, but is capable of running unmodified PowerPC 440 Linux kernels as guests on a PowerPC 440 host. (Only tested with 440EP "Bamboo" guests so far, but with appropriate userspace support other SoC/board combinations should work.) See Documentation/powerpc/kvm_440.txt for technical details. [stephen: build fix] Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-04-17 08:28:09 +04:00
/* Finish loading guest volatiles and jump to guest. */
lwz r3, VCPU_CTR(r4)
mtctr r3
lwz r3, VCPU_CR(r4)
mtcr r3
lwz r5, VCPU_GPR(r5)(r4)
lwz r6, VCPU_GPR(r6)(r4)
lwz r7, VCPU_GPR(r7)(r4)
lwz r8, VCPU_GPR(r8)(r4)
lwz r3, VCPU_PC(r4)
mtsrr0 r3
lwz r3, VCPU_MSR(r4)
oris r3, r3, KVMPPC_MSR_MASK@h
ori r3, r3, KVMPPC_MSR_MASK@l
mtsrr1 r3
KVM: ppc: guest breakpoint support Allow host userspace to program hardware debug registers to set breakpoints inside guests. Signed-off-by: Jerone Young <jyoung5@us.ibm.com> Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-07-25 22:54:49 +04:00
/* Clear any debug events which occurred since we disabled MSR[DE].
* XXX This gives us a 3-instruction window in which a breakpoint
* intended for guest context could fire in the host instead. */
lis r3, 0xffff
ori r3, r3, 0xffff
mtspr SPRN_DBSR, r3
KVM: ppc: PowerPC 440 KVM implementation This functionality is definitely experimental, but is capable of running unmodified PowerPC 440 Linux kernels as guests on a PowerPC 440 host. (Only tested with 440EP "Bamboo" guests so far, but with appropriate userspace support other SoC/board combinations should work.) See Documentation/powerpc/kvm_440.txt for technical details. [stephen: build fix] Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-04-17 08:28:09 +04:00
lwz r3, VCPU_GPR(r3)(r4)
lwz r4, VCPU_GPR(r4)(r4)
rfi