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-rw-r--r--drivers/kvm/kvm.h551
1 files changed, 551 insertions, 0 deletions
diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
new file mode 100644
index 0000000..5785d08
--- /dev/null
+++ b/drivers/kvm/kvm.h
@@ -0,0 +1,551 @@
+#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 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;
+
+struct kvm_mmu_page {
+ struct list_head link;
+ 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 */
+ u64 *parent_pte;
+};
+
+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 (*inval_page)(struct kvm_vcpu *vcpu, gva_t gva);
+ 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;
+};
+
+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 __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;
+ 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 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_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];
+ struct list_head active_mmu_pages;
+ struct kvm_vcpu vcpus[KVM_MAX_VCPUS];
+ int memory_config_version;
+ int busy;
+};
+
+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_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);
+ int (*is_long_mode)(struct kvm_vcpu *vcpu);
+ void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
+ 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_init(struct kvm_vcpu *vcpu);
+
+int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
+void kvm_mmu_slot_remove_write_access(struct kvm *kvm, 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);
+
+#ifdef __x86_64__
+void set_efer(struct kvm_vcpu *vcpu, u64 efer);
+#endif
+
+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);
+
+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_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 __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)
+
+#ifdef __x86_64__
+
+/*
+ * When emulating 32-bit mode, cr3 is only 32 bits even on x86_64. Therefore
+ * we need to allocate shadow page tables in the first 4GB of memory, which
+ * happens to fit the DMA32 zone.
+ */
+#define GFP_KVM_MMU (GFP_KERNEL | __GFP_DMA32)
+
+#else
+
+#define GFP_KVM_MMU GFP_KERNEL
+
+#endif
+
+#endif
generated by cgit v1.1 at 2024-12-26 16:15:58 +0000