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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 #include "vmcs12.h"
14 
15 struct vmcs_config;
16 
17 DECLARE_STATIC_KEY_FALSE(enable_evmcs);
18 
19 #define current_evmcs ((struct hv_enlightened_vmcs *)this_cpu_read(current_vmcs))
20 
21 #define KVM_EVMCS_VERSION 1
22 
23 /*
24  * Enlightened VMCSv1 doesn't support these:
25  *
26  *	POSTED_INTR_NV                  = 0x00000002,
27  *	GUEST_INTR_STATUS               = 0x00000810,
28  *	APIC_ACCESS_ADDR		= 0x00002014,
29  *	POSTED_INTR_DESC_ADDR           = 0x00002016,
30  *	EOI_EXIT_BITMAP0                = 0x0000201c,
31  *	EOI_EXIT_BITMAP1                = 0x0000201e,
32  *	EOI_EXIT_BITMAP2                = 0x00002020,
33  *	EOI_EXIT_BITMAP3                = 0x00002022,
34  *	GUEST_PML_INDEX			= 0x00000812,
35  *	PML_ADDRESS			= 0x0000200e,
36  *	VM_FUNCTION_CONTROL             = 0x00002018,
37  *	EPTP_LIST_ADDRESS               = 0x00002024,
38  *	VMREAD_BITMAP                   = 0x00002026,
39  *	VMWRITE_BITMAP                  = 0x00002028,
40  *
41  *	TSC_MULTIPLIER                  = 0x00002032,
42  *	PLE_GAP                         = 0x00004020,
43  *	PLE_WINDOW                      = 0x00004022,
44  *	VMX_PREEMPTION_TIMER_VALUE      = 0x0000482E,
45  *      GUEST_IA32_PERF_GLOBAL_CTRL     = 0x00002808,
46  *      HOST_IA32_PERF_GLOBAL_CTRL      = 0x00002c04,
47  *
48  * Currently unsupported in KVM:
49  *	GUEST_IA32_RTIT_CTL		= 0x00002814,
50  */
51 #define EVMCS1_UNSUPPORTED_PINCTRL (PIN_BASED_POSTED_INTR | \
52 				    PIN_BASED_VMX_PREEMPTION_TIMER)
53 #define EVMCS1_UNSUPPORTED_2NDEXEC					\
54 	(SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY |				\
55 	 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |			\
56 	 SECONDARY_EXEC_APIC_REGISTER_VIRT |				\
57 	 SECONDARY_EXEC_ENABLE_PML |					\
58 	 SECONDARY_EXEC_ENABLE_VMFUNC |					\
59 	 SECONDARY_EXEC_SHADOW_VMCS |					\
60 	 SECONDARY_EXEC_TSC_SCALING |					\
61 	 SECONDARY_EXEC_PAUSE_LOOP_EXITING)
62 #define EVMCS1_UNSUPPORTED_VMEXIT_CTRL					\
63 	(VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL |				\
64 	 VM_EXIT_SAVE_VMX_PREEMPTION_TIMER)
65 #define EVMCS1_UNSUPPORTED_VMENTRY_CTRL (VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL)
66 #define EVMCS1_UNSUPPORTED_VMFUNC (VMX_VMFUNC_EPTP_SWITCHING)
67 
68 #if IS_ENABLED(CONFIG_HYPERV)
69 
70 struct evmcs_field {
71 	u16 offset;
72 	u16 clean_field;
73 };
74 
75 extern const struct evmcs_field vmcs_field_to_evmcs_1[];
76 extern const unsigned int nr_evmcs_1_fields;
77 
78 #define ROL16(val, n) ((u16)(((u16)(val) << (n)) | ((u16)(val) >> (16 - (n)))))
79 
get_evmcs_offset(unsigned long field,u16 * clean_field)80 static __always_inline int get_evmcs_offset(unsigned long field,
81 					    u16 *clean_field)
82 {
83 	unsigned int index = ROL16(field, 6);
84 	const struct evmcs_field *evmcs_field;
85 
86 	if (unlikely(index >= nr_evmcs_1_fields)) {
87 		WARN_ONCE(1, "KVM: accessing unsupported EVMCS field %lx\n",
88 			  field);
89 		return -ENOENT;
90 	}
91 
92 	evmcs_field = &vmcs_field_to_evmcs_1[index];
93 
94 	if (clean_field)
95 		*clean_field = evmcs_field->clean_field;
96 
97 	return evmcs_field->offset;
98 }
99 
100 #undef ROL16
101 
evmcs_write64(unsigned long field,u64 value)102 static inline void evmcs_write64(unsigned long field, u64 value)
103 {
104 	u16 clean_field;
105 	int offset = get_evmcs_offset(field, &clean_field);
106 
107 	if (offset < 0)
108 		return;
109 
110 	*(u64 *)((char *)current_evmcs + offset) = value;
111 
112 	current_evmcs->hv_clean_fields &= ~clean_field;
113 }
114 
evmcs_write32(unsigned long field,u32 value)115 static inline void evmcs_write32(unsigned long field, u32 value)
116 {
117 	u16 clean_field;
118 	int offset = get_evmcs_offset(field, &clean_field);
119 
120 	if (offset < 0)
121 		return;
122 
123 	*(u32 *)((char *)current_evmcs + offset) = value;
124 	current_evmcs->hv_clean_fields &= ~clean_field;
125 }
126 
evmcs_write16(unsigned long field,u16 value)127 static inline void evmcs_write16(unsigned long field, u16 value)
128 {
129 	u16 clean_field;
130 	int offset = get_evmcs_offset(field, &clean_field);
131 
132 	if (offset < 0)
133 		return;
134 
135 	*(u16 *)((char *)current_evmcs + offset) = value;
136 	current_evmcs->hv_clean_fields &= ~clean_field;
137 }
138 
evmcs_read64(unsigned long field)139 static inline u64 evmcs_read64(unsigned long field)
140 {
141 	int offset = get_evmcs_offset(field, NULL);
142 
143 	if (offset < 0)
144 		return 0;
145 
146 	return *(u64 *)((char *)current_evmcs + offset);
147 }
148 
evmcs_read32(unsigned long field)149 static inline u32 evmcs_read32(unsigned long field)
150 {
151 	int offset = get_evmcs_offset(field, NULL);
152 
153 	if (offset < 0)
154 		return 0;
155 
156 	return *(u32 *)((char *)current_evmcs + offset);
157 }
158 
evmcs_read16(unsigned long field)159 static inline u16 evmcs_read16(unsigned long field)
160 {
161 	int offset = get_evmcs_offset(field, NULL);
162 
163 	if (offset < 0)
164 		return 0;
165 
166 	return *(u16 *)((char *)current_evmcs + offset);
167 }
168 
evmcs_load(u64 phys_addr)169 static inline void evmcs_load(u64 phys_addr)
170 {
171 	struct hv_vp_assist_page *vp_ap =
172 		hv_get_vp_assist_page(smp_processor_id());
173 
174 	if (current_evmcs->hv_enlightenments_control.nested_flush_hypercall)
175 		vp_ap->nested_control.features.directhypercall = 1;
176 	vp_ap->current_nested_vmcs = phys_addr;
177 	vp_ap->enlighten_vmentry = 1;
178 }
179 
180 __init void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf);
181 #else /* !IS_ENABLED(CONFIG_HYPERV) */
evmcs_write64(unsigned long field,u64 value)182 static inline void evmcs_write64(unsigned long field, u64 value) {}
evmcs_write32(unsigned long field,u32 value)183 static inline void evmcs_write32(unsigned long field, u32 value) {}
evmcs_write16(unsigned long field,u16 value)184 static inline void evmcs_write16(unsigned long field, u16 value) {}
evmcs_read64(unsigned long field)185 static inline u64 evmcs_read64(unsigned long field) { return 0; }
evmcs_read32(unsigned long field)186 static inline u32 evmcs_read32(unsigned long field) { return 0; }
evmcs_read16(unsigned long field)187 static inline u16 evmcs_read16(unsigned long field) { return 0; }
evmcs_load(u64 phys_addr)188 static inline void evmcs_load(u64 phys_addr) {}
189 #endif /* IS_ENABLED(CONFIG_HYPERV) */
190 
191 enum nested_evmptrld_status {
192 	EVMPTRLD_DISABLED,
193 	EVMPTRLD_SUCCEEDED,
194 	EVMPTRLD_VMFAIL,
195 	EVMPTRLD_ERROR,
196 };
197 
198 bool nested_enlightened_vmentry(struct kvm_vcpu *vcpu, u64 *evmcs_gpa);
199 uint16_t nested_get_evmcs_version(struct kvm_vcpu *vcpu);
200 int nested_enable_evmcs(struct kvm_vcpu *vcpu,
201 			uint16_t *vmcs_version);
202 void nested_evmcs_filter_control_msr(u32 msr_index, u64 *pdata);
203 int nested_evmcs_check_controls(struct vmcs12 *vmcs12);
204 
205 #endif /* __KVM_X86_VMX_EVMCS_H */
206