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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/drivers/kvm/kvm.h

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16 KiB
C
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#ifndef __KVM_H
#define __KVM_H
/*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*/
#include <linux/types.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
#include "vmx.h"
#include <linux/kvm.h>
#define CR0_PE_MASK (1ULL << 0)
#define CR0_TS_MASK (1ULL << 3)
#define CR0_NE_MASK (1ULL << 5)
#define CR0_WP_MASK (1ULL << 16)
#define CR0_NW_MASK (1ULL << 29)
#define CR0_CD_MASK (1ULL << 30)
#define CR0_PG_MASK (1ULL << 31)
#define CR3_WPT_MASK (1ULL << 3)
#define CR3_PCD_MASK (1ULL << 4)
#define CR3_RESEVED_BITS 0x07ULL
#define CR3_L_MODE_RESEVED_BITS (~((1ULL << 40) - 1) | 0x0fe7ULL)
#define CR3_FLAGS_MASK ((1ULL << 5) - 1)
#define CR4_VME_MASK (1ULL << 0)
#define CR4_PSE_MASK (1ULL << 4)
#define CR4_PAE_MASK (1ULL << 5)
#define CR4_PGE_MASK (1ULL << 7)
#define CR4_VMXE_MASK (1ULL << 13)
#define KVM_GUEST_CR0_MASK \
(CR0_PG_MASK | CR0_PE_MASK | CR0_WP_MASK | CR0_NE_MASK \
| CR0_NW_MASK | CR0_CD_MASK)
#define KVM_VM_CR0_ALWAYS_ON \
(CR0_PG_MASK | CR0_PE_MASK | CR0_WP_MASK | CR0_NE_MASK)
#define KVM_GUEST_CR4_MASK \
(CR4_PSE_MASK | CR4_PAE_MASK | CR4_PGE_MASK | CR4_VMXE_MASK | CR4_VME_MASK)
#define KVM_PMODE_VM_CR4_ALWAYS_ON (CR4_VMXE_MASK | CR4_PAE_MASK)
#define KVM_RMODE_VM_CR4_ALWAYS_ON (CR4_VMXE_MASK | CR4_PAE_MASK | CR4_VME_MASK)
#define INVALID_PAGE (~(hpa_t)0)
#define UNMAPPED_GVA (~(gpa_t)0)
#define KVM_MAX_VCPUS 1
#define KVM_MEMORY_SLOTS 4
#define KVM_NUM_MMU_PAGES 256
#define KVM_MIN_FREE_MMU_PAGES 5
#define KVM_REFILL_PAGES 25
#define FX_IMAGE_SIZE 512
#define FX_IMAGE_ALIGN 16
#define FX_BUF_SIZE (2 * FX_IMAGE_SIZE + FX_IMAGE_ALIGN)
#define DE_VECTOR 0
#define DF_VECTOR 8
#define TS_VECTOR 10
#define NP_VECTOR 11
#define SS_VECTOR 12
#define GP_VECTOR 13
#define PF_VECTOR 14
#define SELECTOR_TI_MASK (1 << 2)
#define SELECTOR_RPL_MASK 0x03
#define IOPL_SHIFT 12
/*
* Address types:
*
* gva - guest virtual address
* gpa - guest physical address
* gfn - guest frame number
* hva - host virtual address
* hpa - host physical address
* hfn - host frame number
*/
typedef unsigned long gva_t;
typedef u64 gpa_t;
typedef unsigned long gfn_t;
typedef unsigned long hva_t;
typedef u64 hpa_t;
typedef unsigned long hfn_t;
#define NR_PTE_CHAIN_ENTRIES 5
struct kvm_pte_chain {
u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
struct hlist_node link;
};
/*
* kvm_mmu_page_role, below, is defined as:
*
* bits 0:3 - total guest paging levels (2-4, or zero for real mode)
* bits 4:7 - page table level for this shadow (1-4)
* bits 8:9 - page table quadrant for 2-level guests
* bit 16 - "metaphysical" - gfn is not a real page (huge page/real mode)
*/
union kvm_mmu_page_role {
unsigned word;
struct {
unsigned glevels : 4;
unsigned level : 4;
unsigned quadrant : 2;
unsigned pad_for_nice_hex_output : 6;
unsigned metaphysical : 1;
};
};
struct kvm_mmu_page {
struct list_head link;
struct hlist_node hash_link;
/*
* The following two entries are used to key the shadow page in the
* hash table.
*/
gfn_t gfn;
union kvm_mmu_page_role role;
hpa_t page_hpa;
unsigned long slot_bitmap; /* One bit set per slot which has memory
* in this shadow page.
*/
int global; /* Set if all ptes in this page are global */
int multimapped; /* More than one parent_pte? */
int root_count; /* Currently serving as active root */
union {
u64 *parent_pte; /* !multimapped */
struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
};
};
struct vmcs {
u32 revision_id;
u32 abort;
char data[0];
};
#define vmx_msr_entry kvm_msr_entry
struct kvm_vcpu;
/*
* x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
* 32-bit). The kvm_mmu structure abstracts the details of the current mmu
* mode.
*/
struct kvm_mmu {
void (*new_cr3)(struct kvm_vcpu *vcpu);
int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
void (*free)(struct kvm_vcpu *vcpu);
gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
hpa_t root_hpa;
int root_level;
int shadow_root_level;
u64 *pae_root;
};
#define KVM_NR_MEM_OBJS 20
struct kvm_mmu_memory_cache {
int nobjs;
void *objects[KVM_NR_MEM_OBJS];
};
/*
* We don't want allocation failures within the mmu code, so we preallocate
* enough memory for a single page fault in a cache.
*/
struct kvm_guest_debug {
int enabled;
unsigned long bp[4];
int singlestep;
};
enum {
VCPU_REGS_RAX = 0,
VCPU_REGS_RCX = 1,
VCPU_REGS_RDX = 2,
VCPU_REGS_RBX = 3,
VCPU_REGS_RSP = 4,
VCPU_REGS_RBP = 5,
VCPU_REGS_RSI = 6,
VCPU_REGS_RDI = 7,
#ifdef CONFIG_X86_64
VCPU_REGS_R8 = 8,
VCPU_REGS_R9 = 9,
VCPU_REGS_R10 = 10,
VCPU_REGS_R11 = 11,
VCPU_REGS_R12 = 12,
VCPU_REGS_R13 = 13,
VCPU_REGS_R14 = 14,
VCPU_REGS_R15 = 15,
#endif
NR_VCPU_REGS
};
enum {
VCPU_SREG_CS,
VCPU_SREG_DS,
VCPU_SREG_ES,
VCPU_SREG_FS,
VCPU_SREG_GS,
VCPU_SREG_SS,
VCPU_SREG_TR,
VCPU_SREG_LDTR,
};
struct kvm_vcpu {
struct kvm *kvm;
union {
struct vmcs *vmcs;
struct vcpu_svm *svm;
};
struct mutex mutex;
int cpu;
int launched;
int interrupt_window_open;
unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
#define NR_IRQ_WORDS KVM_IRQ_BITMAP_SIZE(unsigned long)
unsigned long irq_pending[NR_IRQ_WORDS];
unsigned long regs[NR_VCPU_REGS]; /* for rsp: vcpu_load_rsp_rip() */
unsigned long rip; /* needs vcpu_load_rsp_rip() */
unsigned long cr0;
unsigned long cr2;
unsigned long cr3;
unsigned long cr4;
unsigned long cr8;
u64 pdptrs[4]; /* pae */
u64 shadow_efer;
u64 apic_base;
int nmsrs;
struct vmx_msr_entry *guest_msrs;
struct vmx_msr_entry *host_msrs;
struct list_head free_pages;
struct kvm_mmu_page page_header_buf[KVM_NUM_MMU_PAGES];
struct kvm_mmu mmu;
struct kvm_mmu_memory_cache mmu_pte_chain_cache;
struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
gfn_t last_pt_write_gfn;
int last_pt_write_count;
struct kvm_guest_debug guest_debug;
char fx_buf[FX_BUF_SIZE];
char *host_fx_image;
char *guest_fx_image;
int mmio_needed;
int mmio_read_completed;
int mmio_is_write;
int mmio_size;
unsigned char mmio_data[8];
gpa_t mmio_phys_addr;
struct {
int active;
u8 save_iopl;
struct kvm_save_segment {
u16 selector;
unsigned long base;
u32 limit;
u32 ar;
} tr, es, ds, fs, gs;
} rmode;
};
struct kvm_memory_slot {
gfn_t base_gfn;
unsigned long npages;
unsigned long flags;
struct page **phys_mem;
unsigned long *dirty_bitmap;
};
struct kvm {
spinlock_t lock; /* protects everything except vcpus */
int nmemslots;
struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS];
/*
* Hash table of struct kvm_mmu_page.
*/
struct list_head active_mmu_pages;
int n_free_mmu_pages;
struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
struct kvm_vcpu vcpus[KVM_MAX_VCPUS];
int memory_config_version;
int busy;
unsigned long rmap_overflow;
};
struct kvm_stat {
u32 pf_fixed;
u32 pf_guest;
u32 tlb_flush;
u32 invlpg;
u32 exits;
u32 io_exits;
u32 mmio_exits;
u32 signal_exits;
u32 irq_window_exits;
u32 halt_exits;
u32 request_irq_exits;
u32 irq_exits;
};
struct descriptor_table {
u16 limit;
unsigned long base;
} __attribute__((packed));
struct kvm_arch_ops {
int (*cpu_has_kvm_support)(void); /* __init */
int (*disabled_by_bios)(void); /* __init */
void (*hardware_enable)(void *dummy); /* __init */
void (*hardware_disable)(void *dummy);
int (*hardware_setup)(void); /* __init */
void (*hardware_unsetup)(void); /* __exit */
int (*vcpu_create)(struct kvm_vcpu *vcpu);
void (*vcpu_free)(struct kvm_vcpu *vcpu);
struct kvm_vcpu *(*vcpu_load)(struct kvm_vcpu *vcpu);
void (*vcpu_put)(struct kvm_vcpu *vcpu);
int (*set_guest_debug)(struct kvm_vcpu *vcpu,
struct kvm_debug_guest *dbg);
int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
void (*get_segment)(struct kvm_vcpu *vcpu,
struct kvm_segment *var, int seg);
void (*set_segment)(struct kvm_vcpu *vcpu,
struct kvm_segment *var, int seg);
void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
void (*decache_cr0_cr4_guest_bits)(struct kvm_vcpu *vcpu);
void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
void (*set_cr0_no_modeswitch)(struct kvm_vcpu *vcpu,
unsigned long cr0);
void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
int *exception);
void (*cache_regs)(struct kvm_vcpu *vcpu);
void (*decache_regs)(struct kvm_vcpu *vcpu);
unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
void (*invlpg)(struct kvm_vcpu *vcpu, gva_t addr);
void (*tlb_flush)(struct kvm_vcpu *vcpu);
void (*inject_page_fault)(struct kvm_vcpu *vcpu,
unsigned long addr, u32 err_code);
void (*inject_gp)(struct kvm_vcpu *vcpu, unsigned err_code);
int (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
int (*vcpu_setup)(struct kvm_vcpu *vcpu);
void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
};
extern struct kvm_stat kvm_stat;
extern struct kvm_arch_ops *kvm_arch_ops;
#define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
#define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module);
void kvm_exit_arch(void);
void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
int kvm_mmu_create(struct kvm_vcpu *vcpu);
int kvm_mmu_setup(struct kvm_vcpu *vcpu);
int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
void kvm_mmu_slot_remove_write_access(struct kvm_vcpu *vcpu, int slot);
hpa_t gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa);
#define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
#define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
hpa_t gva_to_hpa(struct kvm_vcpu *vcpu, gva_t gva);
void kvm_emulator_want_group7_invlpg(void);
extern hpa_t bad_page_address;
static inline struct page *gfn_to_page(struct kvm_memory_slot *slot, gfn_t gfn)
{
return slot->phys_mem[gfn - slot->base_gfn];
}
struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
enum emulation_result {
EMULATE_DONE, /* no further processing */
EMULATE_DO_MMIO, /* kvm_run filled with mmio request */
EMULATE_FAIL, /* can't emulate this instruction */
};
int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
unsigned long cr2, u16 error_code);
void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
unsigned long *rflags);
unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
unsigned long *rflags);
struct x86_emulate_ctxt;
int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
int emulate_clts(struct kvm_vcpu *vcpu);
int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr,
unsigned long *dest);
int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
unsigned long value);
void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr0);
void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr0);
void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr0);
void lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
void fx_init(struct kvm_vcpu *vcpu);
void load_msrs(struct vmx_msr_entry *e, int n);
void save_msrs(struct vmx_msr_entry *e, int n);
void kvm_resched(struct kvm_vcpu *vcpu);
int kvm_read_guest(struct kvm_vcpu *vcpu,
gva_t addr,
unsigned long size,
void *dest);
int kvm_write_guest(struct kvm_vcpu *vcpu,
gva_t addr,
unsigned long size,
void *data);
unsigned long segment_base(u16 selector);
void kvm_mmu_pre_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes);
void kvm_mmu_post_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes);
int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
static inline int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
u32 error_code)
{
if (unlikely(vcpu->kvm->n_free_mmu_pages < KVM_MIN_FREE_MMU_PAGES))
kvm_mmu_free_some_pages(vcpu);
return vcpu->mmu.page_fault(vcpu, gva, error_code);
}
static inline struct page *_gfn_to_page(struct kvm *kvm, gfn_t gfn)
{
struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
return (slot) ? slot->phys_mem[gfn - slot->base_gfn] : NULL;
}
static inline int is_long_mode(struct kvm_vcpu *vcpu)
{
#ifdef CONFIG_X86_64
return vcpu->shadow_efer & EFER_LME;
#else
return 0;
#endif
}
static inline int is_pae(struct kvm_vcpu *vcpu)
{
return vcpu->cr4 & CR4_PAE_MASK;
}
static inline int is_pse(struct kvm_vcpu *vcpu)
{
return vcpu->cr4 & CR4_PSE_MASK;
}
static inline int is_paging(struct kvm_vcpu *vcpu)
{
return vcpu->cr0 & CR0_PG_MASK;
}
static inline int memslot_id(struct kvm *kvm, struct kvm_memory_slot *slot)
{
return slot - kvm->memslots;
}
static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
{
struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
return (struct kvm_mmu_page *)page->private;
}
static inline u16 read_fs(void)
{
u16 seg;
asm ("mov %%fs, %0" : "=g"(seg));
return seg;
}
static inline u16 read_gs(void)
{
u16 seg;
asm ("mov %%gs, %0" : "=g"(seg));
return seg;
}
static inline u16 read_ldt(void)
{
u16 ldt;
asm ("sldt %0" : "=g"(ldt));
return ldt;
}
static inline void load_fs(u16 sel)
{
asm ("mov %0, %%fs" : : "rm"(sel));
}
static inline void load_gs(u16 sel)
{
asm ("mov %0, %%gs" : : "rm"(sel));
}
#ifndef load_ldt
static inline void load_ldt(u16 sel)
{
asm ("lldt %0" : : "g"(sel));
}
#endif
static inline void get_idt(struct descriptor_table *table)
{
asm ("sidt %0" : "=m"(*table));
}
static inline void get_gdt(struct descriptor_table *table)
{
asm ("sgdt %0" : "=m"(*table));
}
static inline unsigned long read_tr_base(void)
{
u16 tr;
asm ("str %0" : "=g"(tr));
return segment_base(tr);
}
#ifdef CONFIG_X86_64
static inline unsigned long read_msr(unsigned long msr)
{
u64 value;
rdmsrl(msr, value);
return value;
}
#endif
static inline void fx_save(void *image)
{
asm ("fxsave (%0)":: "r" (image));
}
static inline void fx_restore(void *image)
{
asm ("fxrstor (%0)":: "r" (image));
}
static inline void fpu_init(void)
{
asm ("finit");
}
static inline u32 get_rdx_init_val(void)
{
return 0x600; /* P6 family */
}
#define ASM_VMX_VMCLEAR_RAX ".byte 0x66, 0x0f, 0xc7, 0x30"
#define ASM_VMX_VMLAUNCH ".byte 0x0f, 0x01, 0xc2"
#define ASM_VMX_VMRESUME ".byte 0x0f, 0x01, 0xc3"
#define ASM_VMX_VMPTRLD_RAX ".byte 0x0f, 0xc7, 0x30"
#define ASM_VMX_VMREAD_RDX_RAX ".byte 0x0f, 0x78, 0xd0"
#define ASM_VMX_VMWRITE_RAX_RDX ".byte 0x0f, 0x79, 0xd0"
#define ASM_VMX_VMWRITE_RSP_RDX ".byte 0x0f, 0x79, 0xd4"
#define ASM_VMX_VMXOFF ".byte 0x0f, 0x01, 0xc4"
#define ASM_VMX_VMXON_RAX ".byte 0xf3, 0x0f, 0xc7, 0x30"
#define MSR_IA32_TIME_STAMP_COUNTER 0x010
#define TSS_IOPB_BASE_OFFSET 0x66
#define TSS_BASE_SIZE 0x68
#define TSS_IOPB_SIZE (65536 / 8)
#define TSS_REDIRECTION_SIZE (256 / 8)
#define RMODE_TSS_SIZE (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
#endif
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