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c7addb9020
kernel-aes67/drivers/kvm/kvm.h
Avi Kivity c7addb9020 KVM: Allow not-present guest page faults to bypass kvm 
There are two classes of page faults trapped by kvm:
 - host page faults, where the fault is needed to allow kvm to install
   the shadow pte or update the guest accessed and dirty bits
 - guest page faults, where the guest has faulted and kvm simply injects
   the fault back into the guest to handle

The second class, guest page faults, is pure overhead.  We can eliminate
some of it on vmx using the following evil trick:
 - when we set up a shadow page table entry, if the corresponding guest pte
   is not present, set up the shadow pte as not present
 - if the guest pte _is_ present, mark the shadow pte as present but also
   set one of the reserved bits in the shadow pte
 - tell the vmx hardware not to trap faults which have the present bit clear

With this, normal page-not-present faults go directly to the guest,
bypassing kvm entirely.

Unfortunately, this trick only works on Intel hardware, as AMD lacks a
way to discriminate among page faults based on error code.  It is also
a little risky since it uses reserved bits which might become unreserved
in the future, so a module parameter is provided to disable it.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:48 +02:00

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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/signal.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/preempt.h>
#include <asm/signal.h>
#include <linux/kvm.h>
#include <linux/kvm_para.h>
#define CR3_PAE_RESERVED_BITS ((X86_CR3_PWT | X86_CR3_PCD) - 1)
#define CR3_NONPAE_RESERVED_BITS ((PAGE_SIZE-1) & ~(X86_CR3_PWT | X86_CR3_PCD))
#define CR3_L_MODE_RESERVED_BITS (CR3_NONPAE_RESERVED_BITS|0xFFFFFF0000000000ULL)
#define KVM_GUEST_CR0_MASK \
(X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE \
| X86_CR0_NW | X86_CR0_CD)
#define KVM_VM_CR0_ALWAYS_ON \
(X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE | X86_CR0_TS \
| X86_CR0_MP)
#define KVM_GUEST_CR4_MASK \
(X86_CR4_VME | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_PGE | X86_CR4_VMXE)
#define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE)
#define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE)
#define INVALID_PAGE (~(hpa_t)0)
#define UNMAPPED_GVA (~(gpa_t)0)
#define KVM_MAX_VCPUS 4
#define KVM_ALIAS_SLOTS 4
#define KVM_MEMORY_SLOTS 8
#define KVM_NUM_MMU_PAGES 1024
#define KVM_MIN_FREE_MMU_PAGES 5
#define KVM_REFILL_PAGES 25
#define KVM_MAX_CPUID_ENTRIES 40
#define DE_VECTOR 0
#define UD_VECTOR 6
#define NM_VECTOR 7
#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
#define KVM_PIO_PAGE_OFFSET 1
/*
* vcpu->requests bit members
*/
#define KVM_TLB_FLUSH 0
/*
* 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)
* bits 17:19 - "access" - the user, writable, and nx bits of a huge page pde
*/
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;
unsigned hugepage_access : 3;
};
};
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;
u64 *spt;
unsigned long slot_bitmap; /* One bit set per slot which has memory
* in this shadow page.
*/
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 kvm_vcpu;
extern struct kmem_cache *kvm_vcpu_cache;
/*
* 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);
void (*prefetch_page)(struct kvm_vcpu *vcpu,
struct kvm_mmu_page *page);
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,
};
#include "x86_emulate.h"
struct kvm_pio_request {
unsigned long count;
int cur_count;
struct page *guest_pages[2];
unsigned guest_page_offset;
int in;
int port;
int size;
int string;
int down;
int rep;
};
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 halt_wakeup;
u32 request_irq_exits;
u32 irq_exits;
u32 light_exits;
u32 efer_reload;
};
struct kvm_io_device {
void (*read)(struct kvm_io_device *this,
gpa_t addr,
int len,
void *val);
void (*write)(struct kvm_io_device *this,
gpa_t addr,
int len,
const void *val);
int (*in_range)(struct kvm_io_device *this, gpa_t addr);
void (*destructor)(struct kvm_io_device *this);
void *private;
};
static inline void kvm_iodevice_read(struct kvm_io_device *dev,
gpa_t addr,
int len,
void *val)
{
dev->read(dev, addr, len, val);
}
static inline void kvm_iodevice_write(struct kvm_io_device *dev,
gpa_t addr,
int len,
const void *val)
{
dev->write(dev, addr, len, val);
}
static inline int kvm_iodevice_inrange(struct kvm_io_device *dev, gpa_t addr)
{
return dev->in_range(dev, addr);
}
static inline void kvm_iodevice_destructor(struct kvm_io_device *dev)
{
if (dev->destructor)
dev->destructor(dev);
}
/*
* It would be nice to use something smarter than a linear search, TBD...
* Thankfully we dont expect many devices to register (famous last words :),
* so until then it will suffice. At least its abstracted so we can change
* in one place.
*/
struct kvm_io_bus {
int dev_count;
#define NR_IOBUS_DEVS 6
struct kvm_io_device *devs[NR_IOBUS_DEVS];
};
void kvm_io_bus_init(struct kvm_io_bus *bus);
void kvm_io_bus_destroy(struct kvm_io_bus *bus);
struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr);
void kvm_io_bus_register_dev(struct kvm_io_bus *bus,
struct kvm_io_device *dev);
struct kvm_vcpu {
struct kvm *kvm;
struct preempt_notifier preempt_notifier;
int vcpu_id;
struct mutex mutex;
int cpu;
u64 host_tsc;
struct kvm_run *run;
int interrupt_window_open;
int guest_mode;
unsigned long requests;
unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
DECLARE_BITMAP(irq_pending, KVM_NR_INTERRUPTS);
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;
struct kvm_lapic *apic; /* kernel irqchip context */
#define VCPU_MP_STATE_RUNNABLE 0
#define VCPU_MP_STATE_UNINITIALIZED 1
#define VCPU_MP_STATE_INIT_RECEIVED 2
#define VCPU_MP_STATE_SIPI_RECEIVED 3
#define VCPU_MP_STATE_HALTED 4
int mp_state;
int sipi_vector;
u64 ia32_misc_enable_msr;
struct kvm_mmu mmu;
struct kvm_mmu_memory_cache mmu_pte_chain_cache;
struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
struct kvm_mmu_memory_cache mmu_page_cache;
struct kvm_mmu_memory_cache mmu_page_header_cache;
gfn_t last_pt_write_gfn;
int last_pt_write_count;
struct kvm_guest_debug guest_debug;
struct i387_fxsave_struct host_fx_image;
struct i387_fxsave_struct guest_fx_image;
int fpu_active;
int guest_fpu_loaded;
int mmio_needed;
int mmio_read_completed;
int mmio_is_write;
int mmio_size;
unsigned char mmio_data[8];
gpa_t mmio_phys_addr;
gva_t mmio_fault_cr2;
struct kvm_pio_request pio;
void *pio_data;
wait_queue_head_t wq;
int sigset_active;
sigset_t sigset;
struct kvm_stat stat;
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;
int halt_request; /* real mode on Intel only */
int cpuid_nent;
struct kvm_cpuid_entry cpuid_entries[KVM_MAX_CPUID_ENTRIES];
/* emulate context */
struct x86_emulate_ctxt emulate_ctxt;
};
struct kvm_mem_alias {
gfn_t base_gfn;
unsigned long npages;
gfn_t target_gfn;
};
struct kvm_memory_slot {
gfn_t base_gfn;
unsigned long npages;
unsigned long flags;
struct page **phys_mem;
unsigned long *dirty_bitmap;
};
struct kvm {
struct mutex lock; /* protects everything except vcpus */
int naliases;
struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
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];
unsigned long rmap_overflow;
struct list_head vm_list;
struct file *filp;
struct kvm_io_bus mmio_bus;
struct kvm_io_bus pio_bus;
struct kvm_pic *vpic;
struct kvm_ioapic *vioapic;
int round_robin_prev_vcpu;
};
static inline struct kvm_pic *pic_irqchip(struct kvm *kvm)
{
return kvm->vpic;
}
static inline struct kvm_ioapic *ioapic_irqchip(struct kvm *kvm)
{
return kvm->vioapic;
}
static inline int irqchip_in_kernel(struct kvm *kvm)
{
return pic_irqchip(kvm) != 0;
}
struct descriptor_table {
u16 limit;
unsigned long base;
} __attribute__((packed));
struct kvm_x86_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);
void (*check_processor_compatibility)(void *rtn);
int (*hardware_setup)(void); /* __init */
void (*hardware_unsetup)(void); /* __exit */
/* Create, but do not attach this VCPU */
struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
void (*vcpu_free)(struct kvm_vcpu *vcpu);
void (*vcpu_reset)(struct kvm_vcpu *vcpu);
void (*prepare_guest_switch)(struct kvm_vcpu *vcpu);
void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
void (*vcpu_put)(struct kvm_vcpu *vcpu);
void (*vcpu_decache)(struct kvm_vcpu *vcpu);
int (*set_guest_debug)(struct kvm_vcpu *vcpu,
struct kvm_debug_guest *dbg);
void (*guest_debug_pre)(struct kvm_vcpu *vcpu);
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_cr4_guest_bits)(struct kvm_vcpu *vcpu);
void (*set_cr0)(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 (*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);
void (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
int (*handle_exit)(struct kvm_run *run, struct kvm_vcpu *vcpu);
void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
void (*patch_hypercall)(struct kvm_vcpu *vcpu,
unsigned char *hypercall_addr);
int (*get_irq)(struct kvm_vcpu *vcpu);
void (*set_irq)(struct kvm_vcpu *vcpu, int vec);
void (*inject_pending_irq)(struct kvm_vcpu *vcpu);
void (*inject_pending_vectors)(struct kvm_vcpu *vcpu,
struct kvm_run *run);
};
extern struct kvm_x86_ops *kvm_x86_ops;
/* The guest did something we don't support. */
#define pr_unimpl(vcpu, fmt, ...) \
do { \
if (printk_ratelimit()) \
printk(KERN_ERR "kvm: %i: cpu%i " fmt, \
current->tgid, (vcpu)->vcpu_id , ## __VA_ARGS__); \
} while(0)
#define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
#define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
int kvm_init_x86(struct kvm_x86_ops *ops, unsigned int vcpu_size,
struct module *module);
void kvm_exit_x86(void);
int kvm_mmu_module_init(void);
void kvm_mmu_module_exit(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);
void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte);
int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
void kvm_mmu_zap_all(struct kvm *kvm);
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);
struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva);
extern hpa_t bad_page_address;
struct page *gfn_to_page(struct kvm *kvm, gfn_t 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, int no_decode);
void kvm_report_emulation_failure(struct kvm_vcpu *cvpu, const char *context);
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);
int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data);
int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
struct x86_emulate_ctxt;
int kvm_emulate_pio (struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
int size, unsigned port);
int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
int size, unsigned long count, int down,
gva_t address, int rep, unsigned port);
void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
int kvm_emulate_halt(struct kvm_vcpu *vcpu);
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);
unsigned long get_cr8(struct kvm_vcpu *vcpu);
void lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l);
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 kvm_resched(struct kvm_vcpu *vcpu);
void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
void kvm_flush_remote_tlbs(struct kvm *kvm);
int emulator_read_std(unsigned long addr,
void *val,
unsigned int bytes,
struct kvm_vcpu *vcpu);
int emulator_write_emulated(unsigned long addr,
const void *val,
unsigned int bytes,
struct kvm_vcpu *vcpu);
unsigned long segment_base(u16 selector);
void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
const u8 *new, 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);
int kvm_mmu_load(struct kvm_vcpu *vcpu);
void kvm_mmu_unload(struct kvm_vcpu *vcpu);
int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
int kvm_fix_hypercall(struct kvm_vcpu *vcpu);
static inline void kvm_guest_enter(void)
{
current->flags |= PF_VCPU;
}
static inline void kvm_guest_exit(void)
{
current->flags &= ~PF_VCPU;
}
static inline int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
u32 error_code)
{
return vcpu->mmu.page_fault(vcpu, gva, error_code);
}
static inline void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
{
if (unlikely(vcpu->kvm->n_free_mmu_pages < KVM_MIN_FREE_MMU_PAGES))
__kvm_mmu_free_some_pages(vcpu);
}
static inline int kvm_mmu_reload(struct kvm_vcpu *vcpu)
{
if (likely(vcpu->mmu.root_hpa != INVALID_PAGE))
return 0;
return kvm_mmu_load(vcpu);
}
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 & X86_CR4_PAE;
}
static inline int is_pse(struct kvm_vcpu *vcpu)
{
return vcpu->cr4 & X86_CR4_PSE;
}
static inline int is_paging(struct kvm_vcpu *vcpu)
{
return vcpu->cr0 & X86_CR0_PG;
}
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(page);
}
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" : : "rm"(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(struct i387_fxsave_struct *image)
{
asm ("fxsave (%0)":: "r" (image));
}
static inline void fx_restore(struct i387_fxsave_struct *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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