root/include/asm-x86/kvm_para.h

INCLUDED FROM

DEFINITIONS

1. kvm_hypercall0
2. kvm_hypercall1
3. kvm_hypercall2
4. kvm_hypercall3
5. kvm_hypercall4
6. kvm_para_available
7. kvm_arch_para_features

#ifndef ASM_X86__KVM_PARA_H
#define ASM_X86__KVM_PARA_H

/* This CPUID returns the signature 'KVMKVMKVM' in ebx, ecx, and edx.  It
 * should be used to determine that a VM is running under KVM.
 */
#define KVM_CPUID_SIGNATURE     0x40000000

/* This CPUID returns a feature bitmap in eax.  Before enabling a particular
 * paravirtualization, the appropriate feature bit should be checked.
 */
#define KVM_CPUID_FEATURES      0x40000001
#define KVM_FEATURE_CLOCKSOURCE         0
#define KVM_FEATURE_NOP_IO_DELAY        1
#define KVM_FEATURE_MMU_OP              2

#define MSR_KVM_WALL_CLOCK  0x11
#define MSR_KVM_SYSTEM_TIME 0x12

#define KVM_MAX_MMU_OP_BATCH           32

/* Operations for KVM_HC_MMU_OP */
#define KVM_MMU_OP_WRITE_PTE            1
#define KVM_MMU_OP_FLUSH_TLB            2
#define KVM_MMU_OP_RELEASE_PT           3

/* Payload for KVM_HC_MMU_OP */
struct kvm_mmu_op_header {
        __u32 op;
        __u32 pad;
};

struct kvm_mmu_op_write_pte {
        struct kvm_mmu_op_header header;
        __u64 pte_phys;
        __u64 pte_val;
};

struct kvm_mmu_op_flush_tlb {
        struct kvm_mmu_op_header header;
};

struct kvm_mmu_op_release_pt {
        struct kvm_mmu_op_header header;
        __u64 pt_phys;
};

#ifdef __KERNEL__
#include <asm/processor.h>

extern void kvmclock_init(void);


/* This instruction is vmcall.  On non-VT architectures, it will generate a
 * trap that we will then rewrite to the appropriate instruction.
 */
#define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"

/* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun
 * instruction.  The hypervisor may replace it with something else but only the
 * instructions are guaranteed to be supported.
 *
 * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
 * The hypercall number should be placed in rax and the return value will be
 * placed in rax.  No other registers will be clobbered unless explicited
 * noted by the particular hypercall.
 */

static inline long kvm_hypercall0(unsigned int nr)
{
        long ret;
        asm volatile(KVM_HYPERCALL
                     : "=a"(ret)
                     : "a"(nr)
                     : "memory");
        return ret;
}

static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
{
        long ret;
        asm volatile(KVM_HYPERCALL
                     : "=a"(ret)
                     : "a"(nr), "b"(p1)
                     : "memory");
        return ret;
}

static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
                                  unsigned long p2)
{
        long ret;
        asm volatile(KVM_HYPERCALL
                     : "=a"(ret)
                     : "a"(nr), "b"(p1), "c"(p2)
                     : "memory");
        return ret;
}

static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
                                  unsigned long p2, unsigned long p3)
{
        long ret;
        asm volatile(KVM_HYPERCALL
                     : "=a"(ret)
                     : "a"(nr), "b"(p1), "c"(p2), "d"(p3)
                     : "memory");
        return ret;
}

static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
                                  unsigned long p2, unsigned long p3,
                                  unsigned long p4)
{
        long ret;
        asm volatile(KVM_HYPERCALL
                     : "=a"(ret)
                     : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4)
                     : "memory");
        return ret;
}

static inline int kvm_para_available(void)
{
        unsigned int eax, ebx, ecx, edx;
        char signature[13];

        cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
        memcpy(signature + 0, &ebx, 4);
        memcpy(signature + 4, &ecx, 4);
        memcpy(signature + 8, &edx, 4);
        signature[12] = 0;

        if (strcmp(signature, "KVMKVMKVM") == 0)
                return 1;

        return 0;
}

static inline unsigned int kvm_arch_para_features(void)
{
        return cpuid_eax(KVM_CPUID_FEATURES);
}

#endif

#endif /* ASM_X86__KVM_PARA_H */