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