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