kvm/include/x86/asm/kvm_para.h

   1 #ifndef KVM_UNIFDEF_H
   2 #define KVM_UNIFDEF_H
   3
   4 #ifdef __i386__
   5 #ifndef CONFIG_X86_32
   6 #define CONFIG_X86_32 1
   7 #endif
   8 #endif
   9
  10 #ifdef __x86_64__
  11 #ifndef CONFIG_X86_64
  12 #define CONFIG_X86_64 1
  13 #endif
  14 #endif
  15
  16 #if defined(__i386__) || defined (__x86_64__)
  17 #ifndef CONFIG_X86
  18 #define CONFIG_X86 1
  19 #endif
  20 #endif
  21
  22 #ifdef __ia64__
  23 #ifndef CONFIG_IA64
  24 #define CONFIG_IA64 1
  25 #endif
  26 #endif
  27
  28 #ifdef __PPC__
  29 #ifndef CONFIG_PPC
  30 #define CONFIG_PPC 1
  31 #endif
  32 #endif
  33
  34 #ifdef __s390__
  35 #ifndef CONFIG_S390
  36 #define CONFIG_S390 1
  37 #endif
  38 #endif
  39
  40 #endif
  41 #ifndef _ASM_X86_KVM_PARA_H
  42 #define _ASM_X86_KVM_PARA_H
  43
  44 /* This CPUID returns the signature 'KVMKVMKVM' in ebx, ecx, and edx.  It
  45  * should be used to determine that a VM is running under KVM.
  46  */
  47 #define KVM_CPUID_SIGNATURE     0x40000000
  48
  49 /* This CPUID returns a feature bitmap in eax.  Before enabling a particular
  50  * paravirtualization, the appropriate feature bit should be checked.
  51  */
  52 #define KVM_CPUID_FEATURES      0x40000001
  53 #define KVM_FEATURE_CLOCKSOURCE         0
  54 #define KVM_FEATURE_NOP_IO_DELAY        1
  55 #define KVM_FEATURE_MMU_OP              2
  56
  57 #define MSR_KVM_WALL_CLOCK  0x11
  58 #define MSR_KVM_SYSTEM_TIME 0x12
  59
  60 #define KVM_MAX_MMU_OP_BATCH           32
  61
  62 /* Operations for KVM_HC_MMU_OP */
  63 #define KVM_MMU_OP_WRITE_PTE            1
  64 #define KVM_MMU_OP_FLUSH_TLB            2
  65 #define KVM_MMU_OP_RELEASE_PT           3
  66
  67 /* Payload for KVM_HC_MMU_OP */
  68 struct kvm_mmu_op_header {
  69         __u32 op;
  70         __u32 pad;
  71 };
  72
  73 struct kvm_mmu_op_write_pte {
  74         struct kvm_mmu_op_header header;
  75         __u64 pte_phys;
  76         __u64 pte_val;
  77 };
  78
  79 struct kvm_mmu_op_flush_tlb {
  80         struct kvm_mmu_op_header header;
  81 };
  82
  83 struct kvm_mmu_op_release_pt {
  84         struct kvm_mmu_op_header header;
  85         __u64 pt_phys;
  86 };
  87
  88 #ifdef __KERNEL__
  89 #include <asm/processor.h>
  90
  91 extern void kvmclock_init(void);
  92
  93
  94 /* This instruction is vmcall.  On non-VT architectures, it will generate a
  95  * trap that we will then rewrite to the appropriate instruction.
  96  */
  97 #define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"
  98
  99 /* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun
 100  * instruction.  The hypervisor may replace it with something else but only the
 101  * instructions are guaranteed to be supported.
 102  *
 103  * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
 104  * The hypercall number should be placed in rax and the return value will be
 105  * placed in rax.  No other registers will be clobbered unless explicited
 106  * noted by the particular hypercall.
 107  */
 108
 109 static inline long kvm_hypercall0(unsigned int nr)
 110 {
 111         long ret;
 112         asm volatile(KVM_HYPERCALL
 113                      : "=a"(ret)
 114                      : "a"(nr)
 115                      : "memory");
 116         return ret;
 117 }
 118
 119 static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
 120 {
 121         long ret;
 122         asm volatile(KVM_HYPERCALL
 123                      : "=a"(ret)
 124                      : "a"(nr), "b"(p1)
 125                      : "memory");
 126         return ret;
 127 }
 128
 129 static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
 130                                   unsigned long p2)
 131 {
 132         long ret;
 133         asm volatile(KVM_HYPERCALL
 134                      : "=a"(ret)
 135                      : "a"(nr), "b"(p1), "c"(p2)
 136                      : "memory");
 137         return ret;
 138 }
 139
 140 static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
 141                                   unsigned long p2, unsigned long p3)
 142 {
 143         long ret;
 144         asm volatile(KVM_HYPERCALL
 145                      : "=a"(ret)
 146                      : "a"(nr), "b"(p1), "c"(p2), "d"(p3)
 147                      : "memory");
 148         return ret;
 149 }
 150
 151 static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
 152                                   unsigned long p2, unsigned long p3,
 153                                   unsigned long p4)
 154 {
 155         long ret;
 156         asm volatile(KVM_HYPERCALL
 157                      : "=a"(ret)
 158                      : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4)
 159                      : "memory");
 160         return ret;
 161 }
 162
 163 static inline int kvm_para_available(void)
 164 {
 165         unsigned int eax, ebx, ecx, edx;
 166         char signature[13];
 167
 168         cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
 169         memcpy(signature + 0, &ebx, 4);
 170         memcpy(signature + 4, &ecx, 4);
 171         memcpy(signature + 8, &edx, 4);
 172         signature[12] = 0;
 173
 174         if (strcmp(signature, "KVMKVMKVM") == 0)
 175                 return 1;
 176
 177         return 0;
 178 }
 179
 180 static inline unsigned int kvm_arch_para_features(void)
 181 {
 182         return cpuid_eax(KVM_CPUID_FEATURES);
 183 }
 184
 185 #endif
 186
 187 #endif /* _ASM_X86_KVM_PARA_H */