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