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 /* Custom MSRs falls in the range 0x4b564d00-0x4b564dff */ 34 #define MSR_KVM_WALL_CLOCK_NEW 0x4b564d00 35 #define MSR_KVM_SYSTEM_TIME_NEW 0x4b564d01 36 #define MSR_KVM_ASYNC_PF_EN 0x4b564d02 37 38 #define KVM_MAX_MMU_OP_BATCH 32 39 40 #define KVM_ASYNC_PF_ENABLED (1 << 0) 41 #define KVM_ASYNC_PF_SEND_ALWAYS (1 << 1) 42 43 /* Operations for KVM_HC_MMU_OP */ 44 #define KVM_MMU_OP_WRITE_PTE 1 45 #define KVM_MMU_OP_FLUSH_TLB 2 46 #define KVM_MMU_OP_RELEASE_PT 3 47 48 /* Payload for KVM_HC_MMU_OP */ 49 struct kvm_mmu_op_header { 50 __u32 op; 51 __u32 pad; 52 }; 53 54 struct kvm_mmu_op_write_pte { 55 struct kvm_mmu_op_header header; 56 __u64 pte_phys; 57 __u64 pte_val; 58 }; 59 60 struct kvm_mmu_op_flush_tlb { 61 struct kvm_mmu_op_header header; 62 }; 63 64 struct kvm_mmu_op_release_pt { 65 struct kvm_mmu_op_header header; 66 __u64 pt_phys; 67 }; 68 69 #define KVM_PV_REASON_PAGE_NOT_PRESENT 1 70 #define KVM_PV_REASON_PAGE_READY 2 71 72 struct kvm_vcpu_pv_apf_data { 73 __u32 reason; 74 __u8 pad[60]; 75 __u32 enabled; 76 }; 77 78 #ifdef __KERNEL__ 79 #include <asm/processor.h> 80 81 extern void kvmclock_init(void); 82 extern int kvm_register_clock(char *txt); 83 84 85 /* This instruction is vmcall. On non-VT architectures, it will generate a 86 * trap that we will then rewrite to the appropriate instruction. 87 */ 88 #define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1" 89 90 /* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun 91 * instruction. The hypervisor may replace it with something else but only the 92 * instructions are guaranteed to be supported. 93 * 94 * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively. 95 * The hypercall number should be placed in rax and the return value will be 96 * placed in rax. No other registers will be clobbered unless explicited 97 * noted by the particular hypercall. 98 */ 99 100 static inline long kvm_hypercall0(unsigned int nr) 101 { 102 long ret; 103 asm volatile(KVM_HYPERCALL 104 : "=a"(ret) 105 : "a"(nr) 106 : "memory"); 107 return ret; 108 } 109 110 static inline long kvm_hypercall1(unsigned int nr, unsigned long p1) 111 { 112 long ret; 113 asm volatile(KVM_HYPERCALL 114 : "=a"(ret) 115 : "a"(nr), "b"(p1) 116 : "memory"); 117 return ret; 118 } 119 120 static inline long kvm_hypercall2(unsigned int nr, unsigned long p1, 121 unsigned long p2) 122 { 123 long ret; 124 asm volatile(KVM_HYPERCALL 125 : "=a"(ret) 126 : "a"(nr), "b"(p1), "c"(p2) 127 : "memory"); 128 return ret; 129 } 130 131 static inline long kvm_hypercall3(unsigned int nr, unsigned long p1, 132 unsigned long p2, unsigned long p3) 133 { 134 long ret; 135 asm volatile(KVM_HYPERCALL 136 : "=a"(ret) 137 : "a"(nr), "b"(p1), "c"(p2), "d"(p3) 138 : "memory"); 139 return ret; 140 } 141 142 static inline long kvm_hypercall4(unsigned int nr, unsigned long p1, 143 unsigned long p2, unsigned long p3, 144 unsigned long p4) 145 { 146 long ret; 147 asm volatile(KVM_HYPERCALL 148 : "=a"(ret) 149 : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4) 150 : "memory"); 151 return ret; 152 } 153 154 static inline int kvm_para_available(void) 155 { 156 unsigned int eax, ebx, ecx, edx; 157 char signature[13]; 158 159 cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx); 160 memcpy(signature + 0, &ebx, 4); 161 memcpy(signature + 4, &ecx, 4); 162 memcpy(signature + 8, &edx, 4); 163 signature[12] = 0; 164 165 if (strcmp(signature, "KVMKVMKVM") == 0) 166 return 1; 167 168 return 0; 169 } 170 171 static inline unsigned int kvm_arch_para_features(void) 172 { 173 return cpuid_eax(KVM_CPUID_FEATURES); 174 } 175 176 #ifdef CONFIG_KVM_GUEST 177 void __init kvm_guest_init(void); 178 void kvm_async_pf_task_wait(u32 token); 179 void kvm_async_pf_task_wake(u32 token); 180 u32 kvm_read_and_reset_pf_reason(void); 181 #else 182 #define kvm_guest_init() do { } while (0) 183 #define kvm_async_pf_task_wait(T) do {} while(0) 184 #define kvm_async_pf_task_wake(T) do {} while(0) 185 static inline u32 kvm_read_and_reset_pf_reason(void) 186 { 187 return 0; 188 } 189 #endif 190 191 #endif /* __KERNEL__ */ 192 193 #endif /* _ASM_X86_KVM_PARA_H */ 194