arch/x86/include/asm/kvm_para.h

   1 #ifndef _ASM_X86_KVM_PARA_H
   2 #define _ASM_X86_KVM_PARA_H
   3
   4 #include <linux/types.h>
   5 #include <asm/hyperv.h>
   6
   7 /* This CPUID returns the signature 'KVMKVMKVM' in ebx, ecx, and edx.  It
   8  * should be used to determine that a VM is running under KVM.
   9  */
  10 #define KVM_CPUID_SIGNATURE     0x40000000
  11
  12 /* This CPUID returns a feature bitmap in eax.  Before enabling a particular
  13  * paravirtualization, the appropriate feature bit should be checked.
  14  */
  15 #define KVM_CPUID_FEATURES      0x40000001
  16 #define KVM_FEATURE_CLOCKSOURCE         0
  17 #define KVM_FEATURE_NOP_IO_DELAY        1
  18 #define KVM_FEATURE_MMU_OP              2
  19 /* This indicates that the new set of kvmclock msrs
  20  * are available. The use of 0x11 and 0x12 is deprecated
  21  */
  22 #define KVM_FEATURE_CLOCKSOURCE2        3
  23 #define KVM_FEATURE_ASYNC_PF            4
  24
  25 /* The last 8 bits are used to indicate how to interpret the flags field
  26  * in pvclock structure. If no bits are set, all flags are ignored.
  27  */
  28 #define KVM_FEATURE_CLOCKSOURCE_STABLE_BIT      24
  29
  30 #define MSR_KVM_WALL_CLOCK  0x11
  31 #define MSR_KVM_SYSTEM_TIME 0x12
  32
  33 #define KVM_MSR_ENABLED 1
  34 /* Custom MSRs falls in the range 0x4b564d00-0x4b564dff */
  35 #define MSR_KVM_WALL_CLOCK_NEW  0x4b564d00
  36 #define MSR_KVM_SYSTEM_TIME_NEW 0x4b564d01
  37 #define MSR_KVM_ASYNC_PF_EN 0x4b564d02
  38
  39 #define KVM_MAX_MMU_OP_BATCH           32
  40
  41 #define KVM_ASYNC_PF_ENABLED                    (1 << 0)
  42 #define KVM_ASYNC_PF_SEND_ALWAYS                (1 << 1)
  43
  44 /* Operations for KVM_HC_MMU_OP */
  45 #define KVM_MMU_OP_WRITE_PTE            1
  46 #define KVM_MMU_OP_FLUSH_TLB            2
  47 #define KVM_MMU_OP_RELEASE_PT           3
  48
  49 /* Payload for KVM_HC_MMU_OP */
  50 struct kvm_mmu_op_header {
  51         __u32 op;
  52         __u32 pad;
  53 };
  54
  55 struct kvm_mmu_op_write_pte {
  56         struct kvm_mmu_op_header header;
  57         __u64 pte_phys;
  58         __u64 pte_val;
  59 };
  60
  61 struct kvm_mmu_op_flush_tlb {
  62         struct kvm_mmu_op_header header;
  63 };
  64
  65 struct kvm_mmu_op_release_pt {
  66         struct kvm_mmu_op_header header;
  67         __u64 pt_phys;
  68 };
  69
  70 #define KVM_PV_REASON_PAGE_NOT_PRESENT 1
  71 #define KVM_PV_REASON_PAGE_READY 2
  72
  73 struct kvm_vcpu_pv_apf_data {
  74         __u32 reason;
  75         __u8 pad[60];
  76         __u32 enabled;
  77 };
  78
  79 #ifdef __KERNEL__
  80 #include <asm/processor.h>
  81
  82 extern void kvmclock_init(void);
  83 extern int kvm_register_clock(char *txt);
  84
  85
  86 /* This instruction is vmcall.  On non-VT architectures, it will generate a
  87  * trap that we will then rewrite to the appropriate instruction.
  88  */
  89 #define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"
  90
  91 /* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun
  92  * instruction.  The hypervisor may replace it with something else but only the
  93  * instructions are guaranteed to be supported.
  94  *
  95  * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
  96  * The hypercall number should be placed in rax and the return value will be
  97  * placed in rax.  No other registers will be clobbered unless explicited
  98  * noted by the particular hypercall.
  99  */
 100
 101 static inline long kvm_hypercall0(unsigned int nr)
 102 {
 103         long ret;
 104         asm volatile(KVM_HYPERCALL
 105                      : "=a"(ret)
 106                      : "a"(nr)
 107                      : "memory");
 108         return ret;
 109 }
 110
 111 static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
 112 {
 113         long ret;
 114         asm volatile(KVM_HYPERCALL
 115                      : "=a"(ret)
 116                      : "a"(nr), "b"(p1)
 117                      : "memory");
 118         return ret;
 119 }
 120
 121 static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
 122                                   unsigned long p2)
 123 {
 124         long ret;
 125         asm volatile(KVM_HYPERCALL
 126                      : "=a"(ret)
 127                      : "a"(nr), "b"(p1), "c"(p2)
 128                      : "memory");
 129         return ret;
 130 }
 131
 132 static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
 133                                   unsigned long p2, unsigned long p3)
 134 {
 135         long ret;
 136         asm volatile(KVM_HYPERCALL
 137                      : "=a"(ret)
 138                      : "a"(nr), "b"(p1), "c"(p2), "d"(p3)
 139                      : "memory");
 140         return ret;
 141 }
 142
 143 static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
 144                                   unsigned long p2, unsigned long p3,
 145                                   unsigned long p4)
 146 {
 147         long ret;
 148         asm volatile(KVM_HYPERCALL
 149                      : "=a"(ret)
 150                      : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4)
 151                      : "memory");
 152         return ret;
 153 }
 154
 155 static inline int kvm_para_available(void)
 156 {
 157         unsigned int eax, ebx, ecx, edx;
 158         char signature[13];
 159
 160         cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
 161         memcpy(signature + 0, &ebx, 4);
 162         memcpy(signature + 4, &ecx, 4);
 163         memcpy(signature + 8, &edx, 4);
 164         signature[12] = 0;
 165
 166         if (strcmp(signature, "KVMKVMKVM") == 0)
 167                 return 1;
 168
 169         return 0;
 170 }
 171
 172 static inline unsigned int kvm_arch_para_features(void)
 173 {
 174         return cpuid_eax(KVM_CPUID_FEATURES);
 175 }
 176
 177 #ifdef CONFIG_KVM_GUEST
 178 void __init kvm_guest_init(void);
 179 void kvm_async_pf_task_wait(u32 token);
 180 void kvm_async_pf_task_wake(u32 token);
 181 u32 kvm_read_and_reset_pf_reason(void);
 182 #else
 183 #define kvm_guest_init() do { } while (0)
 184 #define kvm_async_pf_task_wait(T) do {} while(0)
 185 #define kvm_async_pf_task_wake(T) do {} while(0)
 186 static inline u32 kvm_read_and_reset_pf_reason(void)
 187 {
 188         return 0;
 189 }
 190 #endif
 191
 192 #endif /* __KERNEL__ */
 193
 194 #endif /* _ASM_X86_KVM_PARA_H */