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 #define KVM_FEATURE_STEAL_TIME 5
25
26 /* The last 8 bits are used to indicate how to interpret the flags field
27 * in pvclock structure. If no bits are set, all flags are ignored.
28 */
29 #define KVM_FEATURE_CLOCKSOURCE_STABLE_BIT 24
30
31 #define MSR_KVM_WALL_CLOCK 0x11
32 #define MSR_KVM_SYSTEM_TIME 0x12
33
34 #define KVM_MSR_ENABLED 1
35 /* Custom MSRs falls in the range 0x4b564d00-0x4b564dff */
36 #define MSR_KVM_WALL_CLOCK_NEW 0x4b564d00
37 #define MSR_KVM_SYSTEM_TIME_NEW 0x4b564d01
38 #define MSR_KVM_ASYNC_PF_EN 0x4b564d02
39 #define MSR_KVM_STEAL_TIME 0x4b564d03
40
41 struct kvm_steal_time {
42 __u64 steal;
43 __u32 version;
44 __u32 flags;
45 __u32 pad[12];
46 };
47
48 #define KVM_STEAL_ALIGNMENT_BITS 5
49 #define KVM_STEAL_VALID_BITS ((-1ULL << (KVM_STEAL_ALIGNMENT_BITS + 1)))
50 #define KVM_STEAL_RESERVED_MASK (((1 << KVM_STEAL_ALIGNMENT_BITS) - 1 ) << 1)
51
52 #define KVM_MAX_MMU_OP_BATCH 32
53
54 #define KVM_ASYNC_PF_ENABLED (1 << 0)
55 #define KVM_ASYNC_PF_SEND_ALWAYS (1 << 1)
56
57 /* Operations for KVM_HC_MMU_OP */
58 #define KVM_MMU_OP_WRITE_PTE 1
59 #define KVM_MMU_OP_FLUSH_TLB 2
60 #define KVM_MMU_OP_RELEASE_PT 3
61
62 /* Payload for KVM_HC_MMU_OP */
63 struct kvm_mmu_op_header {
64 __u32 op;
65 __u32 pad;
66 };
67
68 struct kvm_mmu_op_write_pte {
69 struct kvm_mmu_op_header header;
70 __u64 pte_phys;
71 __u64 pte_val;
72 };
73
74 struct kvm_mmu_op_flush_tlb {
75 struct kvm_mmu_op_header header;
76 };
77
78 struct kvm_mmu_op_release_pt {
79 struct kvm_mmu_op_header header;
80 __u64 pt_phys;
81 };
82
83 #define KVM_PV_REASON_PAGE_NOT_PRESENT 1
84 #define KVM_PV_REASON_PAGE_READY 2
85
86 struct kvm_vcpu_pv_apf_data {
87 __u32 reason;
88 __u8 pad[60];
89 __u32 enabled;
90 };
91
92 #ifdef __KERNEL__
93 #include <asm/processor.h>
94
95 extern void kvmclock_init(void);
96 extern int kvm_register_clock(char *txt);
97
98
99 /* This instruction is vmcall. On non-VT architectures, it will generate a
100 * trap that we will then rewrite to the appropriate instruction.
101 */
102 #define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"
103
104 /* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun
105 * instruction. The hypervisor may replace it with something else but only the
106 * instructions are guaranteed to be supported.
107 *
108 * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
109 * The hypercall number should be placed in rax and the return value will be
110 * placed in rax. No other registers will be clobbered unless explicited
111 * noted by the particular hypercall.
112 */
113
kvm_hypercall0(unsigned int nr)114 static inline long kvm_hypercall0(unsigned int nr)
115 {
116 long ret;
117 asm volatile(KVM_HYPERCALL
118 : "=a"(ret)
119 : "a"(nr)
120 : "memory");
121 return ret;
122 }
123
kvm_hypercall1(unsigned int nr,unsigned long p1)124 static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
125 {
126 long ret;
127 asm volatile(KVM_HYPERCALL
128 : "=a"(ret)
129 : "a"(nr), "b"(p1)
130 : "memory");
131 return ret;
132 }
133
kvm_hypercall2(unsigned int nr,unsigned long p1,unsigned long p2)134 static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
135 unsigned long p2)
136 {
137 long ret;
138 asm volatile(KVM_HYPERCALL
139 : "=a"(ret)
140 : "a"(nr), "b"(p1), "c"(p2)
141 : "memory");
142 return ret;
143 }
144
kvm_hypercall3(unsigned int nr,unsigned long p1,unsigned long p2,unsigned long p3)145 static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
146 unsigned long p2, unsigned long p3)
147 {
148 long ret;
149 asm volatile(KVM_HYPERCALL
150 : "=a"(ret)
151 : "a"(nr), "b"(p1), "c"(p2), "d"(p3)
152 : "memory");
153 return ret;
154 }
155
kvm_hypercall4(unsigned int nr,unsigned long p1,unsigned long p2,unsigned long p3,unsigned long p4)156 static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
157 unsigned long p2, unsigned long p3,
158 unsigned long p4)
159 {
160 long ret;
161 asm volatile(KVM_HYPERCALL
162 : "=a"(ret)
163 : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4)
164 : "memory");
165 return ret;
166 }
167
kvm_para_available(void)168 static inline int kvm_para_available(void)
169 {
170 unsigned int eax, ebx, ecx, edx;
171 char signature[13];
172
173 if (boot_cpu_data.cpuid_level < 0)
174 return 0; /* So we don't blow up on old processors */
175
176 cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
177 memcpy(signature + 0, &ebx, 4);
178 memcpy(signature + 4, &ecx, 4);
179 memcpy(signature + 8, &edx, 4);
180 signature[12] = 0;
181
182 if (strcmp(signature, "KVMKVMKVM") == 0)
183 return 1;
184
185 return 0;
186 }
187
kvm_arch_para_features(void)188 static inline unsigned int kvm_arch_para_features(void)
189 {
190 return cpuid_eax(KVM_CPUID_FEATURES);
191 }
192
193 #ifdef CONFIG_KVM_GUEST
194 void __init kvm_guest_init(void);
195 void kvm_async_pf_task_wait(u32 token);
196 void kvm_async_pf_task_wake(u32 token);
197 u32 kvm_read_and_reset_pf_reason(void);
198 extern void kvm_disable_steal_time(void);
199 #else
200 #define kvm_guest_init() do { } while (0)
201 #define kvm_async_pf_task_wait(T) do {} while(0)
202 #define kvm_async_pf_task_wake(T) do {} while(0)
kvm_read_and_reset_pf_reason(void)203 static inline u32 kvm_read_and_reset_pf_reason(void)
204 {
205 return 0;
206 }
207
kvm_disable_steal_time(void)208 static inline void kvm_disable_steal_time(void)
209 {
210 return;
211 }
212 #endif
213
214 #endif /* __KERNEL__ */
215
216 #endif /* _ASM_X86_KVM_PARA_H */
217