1 /* SPDX-License-Identifier: GPL-2.0-only */
2
3 #ifndef __ARCH_X86_KVM_VMX_ONHYPERV_H__
4 #define __ARCH_X86_KVM_VMX_ONHYPERV_H__
5
6 #include <asm/hyperv-tlfs.h>
7
8 #include <linux/jump_label.h>
9
10 #include "capabilities.h"
11 #include "hyperv.h"
12 #include "vmcs12.h"
13
14 #define current_evmcs ((struct hv_enlightened_vmcs *)this_cpu_read(current_vmcs))
15
16 #if IS_ENABLED(CONFIG_HYPERV)
17
18 DECLARE_STATIC_KEY_FALSE(__kvm_is_using_evmcs);
19
kvm_is_using_evmcs(void)20 static __always_inline bool kvm_is_using_evmcs(void)
21 {
22 return static_branch_unlikely(&__kvm_is_using_evmcs);
23 }
24
get_evmcs_offset(unsigned long field,u16 * clean_field)25 static __always_inline int get_evmcs_offset(unsigned long field,
26 u16 *clean_field)
27 {
28 int offset = evmcs_field_offset(field, clean_field);
29
30 WARN_ONCE(offset < 0, "accessing unsupported EVMCS field %lx\n", field);
31 return offset;
32 }
33
evmcs_write64(unsigned long field,u64 value)34 static __always_inline void evmcs_write64(unsigned long field, u64 value)
35 {
36 u16 clean_field;
37 int offset = get_evmcs_offset(field, &clean_field);
38
39 if (offset < 0)
40 return;
41
42 *(u64 *)((char *)current_evmcs + offset) = value;
43
44 current_evmcs->hv_clean_fields &= ~clean_field;
45 }
46
evmcs_write32(unsigned long field,u32 value)47 static __always_inline void evmcs_write32(unsigned long field, u32 value)
48 {
49 u16 clean_field;
50 int offset = get_evmcs_offset(field, &clean_field);
51
52 if (offset < 0)
53 return;
54
55 *(u32 *)((char *)current_evmcs + offset) = value;
56 current_evmcs->hv_clean_fields &= ~clean_field;
57 }
58
evmcs_write16(unsigned long field,u16 value)59 static __always_inline void evmcs_write16(unsigned long field, u16 value)
60 {
61 u16 clean_field;
62 int offset = get_evmcs_offset(field, &clean_field);
63
64 if (offset < 0)
65 return;
66
67 *(u16 *)((char *)current_evmcs + offset) = value;
68 current_evmcs->hv_clean_fields &= ~clean_field;
69 }
70
evmcs_read64(unsigned long field)71 static __always_inline u64 evmcs_read64(unsigned long field)
72 {
73 int offset = get_evmcs_offset(field, NULL);
74
75 if (offset < 0)
76 return 0;
77
78 return *(u64 *)((char *)current_evmcs + offset);
79 }
80
evmcs_read32(unsigned long field)81 static __always_inline u32 evmcs_read32(unsigned long field)
82 {
83 int offset = get_evmcs_offset(field, NULL);
84
85 if (offset < 0)
86 return 0;
87
88 return *(u32 *)((char *)current_evmcs + offset);
89 }
90
evmcs_read16(unsigned long field)91 static __always_inline u16 evmcs_read16(unsigned long field)
92 {
93 int offset = get_evmcs_offset(field, NULL);
94
95 if (offset < 0)
96 return 0;
97
98 return *(u16 *)((char *)current_evmcs + offset);
99 }
100
evmcs_load(u64 phys_addr)101 static inline void evmcs_load(u64 phys_addr)
102 {
103 struct hv_vp_assist_page *vp_ap =
104 hv_get_vp_assist_page(smp_processor_id());
105
106 if (current_evmcs->hv_enlightenments_control.nested_flush_hypercall)
107 vp_ap->nested_control.features.directhypercall = 1;
108 vp_ap->current_nested_vmcs = phys_addr;
109 vp_ap->enlighten_vmentry = 1;
110 }
111
112 void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf);
113 #else /* !IS_ENABLED(CONFIG_HYPERV) */
kvm_is_using_evmcs(void)114 static __always_inline bool kvm_is_using_evmcs(void) { return false; }
evmcs_write64(unsigned long field,u64 value)115 static __always_inline void evmcs_write64(unsigned long field, u64 value) {}
evmcs_write32(unsigned long field,u32 value)116 static __always_inline void evmcs_write32(unsigned long field, u32 value) {}
evmcs_write16(unsigned long field,u16 value)117 static __always_inline void evmcs_write16(unsigned long field, u16 value) {}
evmcs_read64(unsigned long field)118 static __always_inline u64 evmcs_read64(unsigned long field) { return 0; }
evmcs_read32(unsigned long field)119 static __always_inline u32 evmcs_read32(unsigned long field) { return 0; }
evmcs_read16(unsigned long field)120 static __always_inline u16 evmcs_read16(unsigned long field) { return 0; }
evmcs_load(u64 phys_addr)121 static inline void evmcs_load(u64 phys_addr) {}
122 #endif /* IS_ENABLED(CONFIG_HYPERV) */
123
124 #endif /* __ARCH_X86_KVM_VMX_ONHYPERV_H__ */
125