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
kvm_hypercall0(unsigned int nr)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
kvm_hypercall1(unsigned int nr,unsigned long p1)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
kvm_hypercall2(unsigned int nr,unsigned long p1,unsigned long p2)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
kvm_hypercall3(unsigned int nr,unsigned long p1,unsigned long p2,unsigned long p3)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
kvm_hypercall4(unsigned int nr,unsigned long p1,unsigned long p2,unsigned long p3,unsigned long p4)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
kvm_para_available(void)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
kvm_arch_para_features(void)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