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 <hyperv/hvhdk.h>
7#include <asm/mshyperv.h>
8
9#include <linux/jump_label.h>
10
11#include "capabilities.h"
12#include "hyperv_evmcs.h"
13#include "vmcs12.h"
14
15#define current_evmcs ((struct hv_enlightened_vmcs *)this_cpu_read(current_vmcs))
16
17#if IS_ENABLED(CONFIG_HYPERV)
18
19DECLARE_STATIC_KEY_FALSE(__kvm_is_using_evmcs);
20
21static __always_inline bool kvm_is_using_evmcs(void)
22{
23 return static_branch_unlikely(&__kvm_is_using_evmcs);
24}
25
26static __always_inline int get_evmcs_offset(unsigned long field,
27 u16 *clean_field)
28{
29 int offset = evmcs_field_offset(field, clean_field);
30
31 WARN_ONCE(offset < 0, "accessing unsupported EVMCS field %lx\n", field);
32 return offset;
33}
34
35static __always_inline void evmcs_write64(unsigned long field, u64 value)
36{
37 u16 clean_field;
38 int offset = get_evmcs_offset(field, clean_field: &clean_field);
39
40 if (offset < 0)
41 return;
42
43 *(u64 *)((char *)current_evmcs + offset) = value;
44
45 current_evmcs->hv_clean_fields &= ~clean_field;
46}
47
48static __always_inline void evmcs_write32(unsigned long field, u32 value)
49{
50 u16 clean_field;
51 int offset = get_evmcs_offset(field, clean_field: &clean_field);
52
53 if (offset < 0)
54 return;
55
56 *(u32 *)((char *)current_evmcs + offset) = value;
57 current_evmcs->hv_clean_fields &= ~clean_field;
58}
59
60static __always_inline void evmcs_write16(unsigned long field, u16 value)
61{
62 u16 clean_field;
63 int offset = get_evmcs_offset(field, clean_field: &clean_field);
64
65 if (offset < 0)
66 return;
67
68 *(u16 *)((char *)current_evmcs + offset) = value;
69 current_evmcs->hv_clean_fields &= ~clean_field;
70}
71
72static __always_inline u64 evmcs_read64(unsigned long field)
73{
74 int offset = get_evmcs_offset(field, NULL);
75
76 if (offset < 0)
77 return 0;
78
79 return *(u64 *)((char *)current_evmcs + offset);
80}
81
82static __always_inline u32 evmcs_read32(unsigned long field)
83{
84 int offset = get_evmcs_offset(field, NULL);
85
86 if (offset < 0)
87 return 0;
88
89 return *(u32 *)((char *)current_evmcs + offset);
90}
91
92static __always_inline u16 evmcs_read16(unsigned long field)
93{
94 int offset = get_evmcs_offset(field, NULL);
95
96 if (offset < 0)
97 return 0;
98
99 return *(u16 *)((char *)current_evmcs + offset);
100}
101
102static inline void evmcs_load(u64 phys_addr)
103{
104 struct hv_vp_assist_page *vp_ap =
105 hv_get_vp_assist_page(smp_processor_id());
106
107 /*
108 * When enabling eVMCS, KVM verifies that every CPU has a valid hv_vp_assist_page()
109 * and aborts enabling the feature otherwise. CPU onlining path is also checked in
110 * vmx_hardware_enable().
111 */
112 if (KVM_BUG_ON(!vp_ap, kvm_get_running_vcpu()->kvm))
113 return;
114
115 if (current_evmcs->hv_enlightenments_control.nested_flush_hypercall)
116 vp_ap->nested_control.features.directhypercall = 1;
117 vp_ap->current_nested_vmcs = phys_addr;
118 vp_ap->enlighten_vmentry = 1;
119}
120
121void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf);
122#else /* !IS_ENABLED(CONFIG_HYPERV) */
123static __always_inline bool kvm_is_using_evmcs(void) { return false; }
124static __always_inline void evmcs_write64(unsigned long field, u64 value) {}
125static __always_inline void evmcs_write32(unsigned long field, u32 value) {}
126static __always_inline void evmcs_write16(unsigned long field, u16 value) {}
127static __always_inline u64 evmcs_read64(unsigned long field) { return 0; }
128static __always_inline u32 evmcs_read32(unsigned long field) { return 0; }
129static __always_inline u16 evmcs_read16(unsigned long field) { return 0; }
130static inline void evmcs_load(u64 phys_addr) {}
131#endif /* IS_ENABLED(CONFIG_HYPERV) */
132
133#endif /* __ARCH_X86_KVM_VMX_ONHYPERV_H__ */
134

source code of linux/arch/x86/kvm/vmx/vmx_onhyperv.h