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1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __KVM_X86_VMX_EVMCS_H
3 #define __KVM_X86_VMX_EVMCS_H
4 
5 #include <linux/jump_label.h>
6 
7 #include <asm/hyperv-tlfs.h>
8 #include <asm/mshyperv.h>
9 #include <asm/vmx.h>
10 
11 #include "capabilities.h"
12 #include "vmcs.h"
13 
14 struct vmcs_config;
15 
16 DECLARE_STATIC_KEY_FALSE(enable_evmcs);
17 
18 #define current_evmcs ((struct hv_enlightened_vmcs *)this_cpu_read(current_vmcs))
19 
20 #define KVM_EVMCS_VERSION 1
21 
22 /*
23  * Enlightened VMCSv1 doesn't support these:
24  *
25  *	POSTED_INTR_NV                  = 0x00000002,
26  *	GUEST_INTR_STATUS               = 0x00000810,
27  *	APIC_ACCESS_ADDR		= 0x00002014,
28  *	POSTED_INTR_DESC_ADDR           = 0x00002016,
29  *	EOI_EXIT_BITMAP0                = 0x0000201c,
30  *	EOI_EXIT_BITMAP1                = 0x0000201e,
31  *	EOI_EXIT_BITMAP2                = 0x00002020,
32  *	EOI_EXIT_BITMAP3                = 0x00002022,
33  *	GUEST_PML_INDEX			= 0x00000812,
34  *	PML_ADDRESS			= 0x0000200e,
35  *	VM_FUNCTION_CONTROL             = 0x00002018,
36  *	EPTP_LIST_ADDRESS               = 0x00002024,
37  *	VMREAD_BITMAP                   = 0x00002026,
38  *	VMWRITE_BITMAP                  = 0x00002028,
39  *
40  *	TSC_MULTIPLIER                  = 0x00002032,
41  *	PLE_GAP                         = 0x00004020,
42  *	PLE_WINDOW                      = 0x00004022,
43  *	VMX_PREEMPTION_TIMER_VALUE      = 0x0000482E,
44  *      GUEST_IA32_PERF_GLOBAL_CTRL     = 0x00002808,
45  *      HOST_IA32_PERF_GLOBAL_CTRL      = 0x00002c04,
46  *
47  * Currently unsupported in KVM:
48  *	GUEST_IA32_RTIT_CTL		= 0x00002814,
49  */
50 #define EVMCS1_UNSUPPORTED_PINCTRL (PIN_BASED_POSTED_INTR | \
51 				    PIN_BASED_VMX_PREEMPTION_TIMER)
52 #define EVMCS1_UNSUPPORTED_2NDEXEC					\
53 	(SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY |				\
54 	 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |			\
55 	 SECONDARY_EXEC_APIC_REGISTER_VIRT |				\
56 	 SECONDARY_EXEC_ENABLE_PML |					\
57 	 SECONDARY_EXEC_ENABLE_VMFUNC |					\
58 	 SECONDARY_EXEC_SHADOW_VMCS |					\
59 	 SECONDARY_EXEC_TSC_SCALING |					\
60 	 SECONDARY_EXEC_PAUSE_LOOP_EXITING)
61 #define EVMCS1_UNSUPPORTED_VMEXIT_CTRL (VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL)
62 #define EVMCS1_UNSUPPORTED_VMENTRY_CTRL (VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL)
63 #define EVMCS1_UNSUPPORTED_VMFUNC (VMX_VMFUNC_EPTP_SWITCHING)
64 
65 #if IS_ENABLED(CONFIG_HYPERV)
66 
67 struct evmcs_field {
68 	u16 offset;
69 	u16 clean_field;
70 };
71 
72 extern const struct evmcs_field vmcs_field_to_evmcs_1[];
73 extern const unsigned int nr_evmcs_1_fields;
74 
75 #define ROL16(val, n) ((u16)(((u16)(val) << (n)) | ((u16)(val) >> (16 - (n)))))
76 
get_evmcs_offset(unsigned long field,u16 * clean_field)77 static __always_inline int get_evmcs_offset(unsigned long field,
78 					    u16 *clean_field)
79 {
80 	unsigned int index = ROL16(field, 6);
81 	const struct evmcs_field *evmcs_field;
82 
83 	if (unlikely(index >= nr_evmcs_1_fields)) {
84 		WARN_ONCE(1, "KVM: accessing unsupported EVMCS field %lx\n",
85 			  field);
86 		return -ENOENT;
87 	}
88 
89 	evmcs_field = &vmcs_field_to_evmcs_1[index];
90 
91 	if (clean_field)
92 		*clean_field = evmcs_field->clean_field;
93 
94 	return evmcs_field->offset;
95 }
96 
97 #undef ROL16
98 
evmcs_write64(unsigned long field,u64 value)99 static inline void evmcs_write64(unsigned long field, u64 value)
100 {
101 	u16 clean_field;
102 	int offset = get_evmcs_offset(field, &clean_field);
103 
104 	if (offset < 0)
105 		return;
106 
107 	*(u64 *)((char *)current_evmcs + offset) = value;
108 
109 	current_evmcs->hv_clean_fields &= ~clean_field;
110 }
111 
evmcs_write32(unsigned long field,u32 value)112 static inline void evmcs_write32(unsigned long field, u32 value)
113 {
114 	u16 clean_field;
115 	int offset = get_evmcs_offset(field, &clean_field);
116 
117 	if (offset < 0)
118 		return;
119 
120 	*(u32 *)((char *)current_evmcs + offset) = value;
121 	current_evmcs->hv_clean_fields &= ~clean_field;
122 }
123 
evmcs_write16(unsigned long field,u16 value)124 static inline void evmcs_write16(unsigned long field, u16 value)
125 {
126 	u16 clean_field;
127 	int offset = get_evmcs_offset(field, &clean_field);
128 
129 	if (offset < 0)
130 		return;
131 
132 	*(u16 *)((char *)current_evmcs + offset) = value;
133 	current_evmcs->hv_clean_fields &= ~clean_field;
134 }
135 
evmcs_read64(unsigned long field)136 static inline u64 evmcs_read64(unsigned long field)
137 {
138 	int offset = get_evmcs_offset(field, NULL);
139 
140 	if (offset < 0)
141 		return 0;
142 
143 	return *(u64 *)((char *)current_evmcs + offset);
144 }
145 
evmcs_read32(unsigned long field)146 static inline u32 evmcs_read32(unsigned long field)
147 {
148 	int offset = get_evmcs_offset(field, NULL);
149 
150 	if (offset < 0)
151 		return 0;
152 
153 	return *(u32 *)((char *)current_evmcs + offset);
154 }
155 
evmcs_read16(unsigned long field)156 static inline u16 evmcs_read16(unsigned long field)
157 {
158 	int offset = get_evmcs_offset(field, NULL);
159 
160 	if (offset < 0)
161 		return 0;
162 
163 	return *(u16 *)((char *)current_evmcs + offset);
164 }
165 
evmcs_touch_msr_bitmap(void)166 static inline void evmcs_touch_msr_bitmap(void)
167 {
168 	if (unlikely(!current_evmcs))
169 		return;
170 
171 	if (current_evmcs->hv_enlightenments_control.msr_bitmap)
172 		current_evmcs->hv_clean_fields &=
173 			~HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP;
174 }
175 
evmcs_load(u64 phys_addr)176 static inline void evmcs_load(u64 phys_addr)
177 {
178 	struct hv_vp_assist_page *vp_ap =
179 		hv_get_vp_assist_page(smp_processor_id());
180 
181 	if (current_evmcs->hv_enlightenments_control.nested_flush_hypercall)
182 		vp_ap->nested_control.features.directhypercall = 1;
183 	vp_ap->current_nested_vmcs = phys_addr;
184 	vp_ap->enlighten_vmentry = 1;
185 }
186 
187 void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf);
188 #else /* !IS_ENABLED(CONFIG_HYPERV) */
evmcs_write64(unsigned long field,u64 value)189 static inline void evmcs_write64(unsigned long field, u64 value) {}
evmcs_write32(unsigned long field,u32 value)190 static inline void evmcs_write32(unsigned long field, u32 value) {}
evmcs_write16(unsigned long field,u16 value)191 static inline void evmcs_write16(unsigned long field, u16 value) {}
evmcs_read64(unsigned long field)192 static inline u64 evmcs_read64(unsigned long field) { return 0; }
evmcs_read32(unsigned long field)193 static inline u32 evmcs_read32(unsigned long field) { return 0; }
evmcs_read16(unsigned long field)194 static inline u16 evmcs_read16(unsigned long field) { return 0; }
evmcs_load(u64 phys_addr)195 static inline void evmcs_load(u64 phys_addr) {}
evmcs_sanitize_exec_ctrls(struct vmcs_config * vmcs_conf)196 static inline void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf) {}
evmcs_touch_msr_bitmap(void)197 static inline void evmcs_touch_msr_bitmap(void) {}
198 #endif /* IS_ENABLED(CONFIG_HYPERV) */
199 
200 bool nested_enlightened_vmentry(struct kvm_vcpu *vcpu, u64 *evmcs_gpa);
201 uint16_t nested_get_evmcs_version(struct kvm_vcpu *vcpu);
202 int nested_enable_evmcs(struct kvm_vcpu *vcpu,
203 			uint16_t *vmcs_version);
204 
205 #endif /* __KVM_X86_VMX_EVMCS_H */
206