1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_MSHYPER_H
3 #define _ASM_X86_MSHYPER_H
4
5 #include <linux/types.h>
6 #include <linux/nmi.h>
7 #include <linux/msi.h>
8 #include <linux/io.h>
9 #include <asm/nospec-branch.h>
10 #include <asm/paravirt.h>
11 #include <asm/msr.h>
12 #include <hyperv/hvhdk.h>
13
14 /*
15 * Hyper-V always provides a single IO-APIC at this MMIO address.
16 * Ideally, the value should be looked up in ACPI tables, but it
17 * is needed for mapping the IO-APIC early in boot on Confidential
18 * VMs, before ACPI functions can be used.
19 */
20 #define HV_IOAPIC_BASE_ADDRESS 0xfec00000
21
22 #define HV_VTL_NORMAL 0x0
23 #define HV_VTL_SECURE 0x1
24 #define HV_VTL_MGMT 0x2
25
26 union hv_ghcb;
27
28 DECLARE_STATIC_KEY_FALSE(isolation_type_snp);
29 DECLARE_STATIC_KEY_FALSE(isolation_type_tdx);
30
31 typedef int (*hyperv_fill_flush_list_func)(
32 struct hv_guest_mapping_flush_list *flush,
33 void *data);
34
35 void hyperv_vector_handler(struct pt_regs *regs);
36
hv_get_nmi_reason(void)37 static inline unsigned char hv_get_nmi_reason(void)
38 {
39 return 0;
40 }
41
42 #if IS_ENABLED(CONFIG_HYPERV)
43 extern bool hyperv_paravisor_present;
44
45 extern void *hv_hypercall_pg;
46
47 extern union hv_ghcb * __percpu *hv_ghcb_pg;
48
49 bool hv_isolation_type_snp(void);
50 bool hv_isolation_type_tdx(void);
51 u64 hv_tdx_hypercall(u64 control, u64 param1, u64 param2);
52
53 /*
54 * DEFAULT INIT GPAT and SEGMENT LIMIT value in struct VMSA
55 * to start AP in enlightened SEV guest.
56 */
57 #define HV_AP_INIT_GPAT_DEFAULT 0x0007040600070406ULL
58 #define HV_AP_SEGMENT_LIMIT 0xffffffff
59
60 /*
61 * If the hypercall involves no input or output parameters, the hypervisor
62 * ignores the corresponding GPA pointer.
63 */
hv_do_hypercall(u64 control,void * input,void * output)64 static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
65 {
66 u64 input_address = input ? virt_to_phys(input) : 0;
67 u64 output_address = output ? virt_to_phys(output) : 0;
68 u64 hv_status;
69
70 #ifdef CONFIG_X86_64
71 if (hv_isolation_type_tdx() && !hyperv_paravisor_present)
72 return hv_tdx_hypercall(control, input_address, output_address);
73
74 if (hv_isolation_type_snp() && !hyperv_paravisor_present) {
75 __asm__ __volatile__("mov %[output_address], %%r8\n"
76 "vmmcall"
77 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
78 "+c" (control), "+d" (input_address)
79 : [output_address] "r" (output_address)
80 : "cc", "memory", "r8", "r9", "r10", "r11");
81 return hv_status;
82 }
83
84 if (!hv_hypercall_pg)
85 return U64_MAX;
86
87 __asm__ __volatile__("mov %[output_address], %%r8\n"
88 CALL_NOSPEC
89 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
90 "+c" (control), "+d" (input_address)
91 : [output_address] "r" (output_address),
92 THUNK_TARGET(hv_hypercall_pg)
93 : "cc", "memory", "r8", "r9", "r10", "r11");
94 #else
95 u32 input_address_hi = upper_32_bits(input_address);
96 u32 input_address_lo = lower_32_bits(input_address);
97 u32 output_address_hi = upper_32_bits(output_address);
98 u32 output_address_lo = lower_32_bits(output_address);
99
100 if (!hv_hypercall_pg)
101 return U64_MAX;
102
103 __asm__ __volatile__(CALL_NOSPEC
104 : "=A" (hv_status),
105 "+c" (input_address_lo), ASM_CALL_CONSTRAINT
106 : "A" (control),
107 "b" (input_address_hi),
108 "D"(output_address_hi), "S"(output_address_lo),
109 THUNK_TARGET(hv_hypercall_pg)
110 : "cc", "memory");
111 #endif /* !x86_64 */
112 return hv_status;
113 }
114
115 /* Fast hypercall with 8 bytes of input and no output */
_hv_do_fast_hypercall8(u64 control,u64 input1)116 static inline u64 _hv_do_fast_hypercall8(u64 control, u64 input1)
117 {
118 u64 hv_status;
119
120 #ifdef CONFIG_X86_64
121 if (hv_isolation_type_tdx() && !hyperv_paravisor_present)
122 return hv_tdx_hypercall(control, input1, 0);
123
124 if (hv_isolation_type_snp() && !hyperv_paravisor_present) {
125 __asm__ __volatile__(
126 "vmmcall"
127 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
128 "+c" (control), "+d" (input1)
129 :: "cc", "r8", "r9", "r10", "r11");
130 } else {
131 __asm__ __volatile__(CALL_NOSPEC
132 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
133 "+c" (control), "+d" (input1)
134 : THUNK_TARGET(hv_hypercall_pg)
135 : "cc", "r8", "r9", "r10", "r11");
136 }
137 #else
138 {
139 u32 input1_hi = upper_32_bits(input1);
140 u32 input1_lo = lower_32_bits(input1);
141
142 __asm__ __volatile__ (CALL_NOSPEC
143 : "=A"(hv_status),
144 "+c"(input1_lo),
145 ASM_CALL_CONSTRAINT
146 : "A" (control),
147 "b" (input1_hi),
148 THUNK_TARGET(hv_hypercall_pg)
149 : "cc", "edi", "esi");
150 }
151 #endif
152 return hv_status;
153 }
154
hv_do_fast_hypercall8(u16 code,u64 input1)155 static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
156 {
157 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT;
158
159 return _hv_do_fast_hypercall8(control, input1);
160 }
161
162 /* Fast hypercall with 16 bytes of input */
_hv_do_fast_hypercall16(u64 control,u64 input1,u64 input2)163 static inline u64 _hv_do_fast_hypercall16(u64 control, u64 input1, u64 input2)
164 {
165 u64 hv_status;
166
167 #ifdef CONFIG_X86_64
168 if (hv_isolation_type_tdx() && !hyperv_paravisor_present)
169 return hv_tdx_hypercall(control, input1, input2);
170
171 if (hv_isolation_type_snp() && !hyperv_paravisor_present) {
172 __asm__ __volatile__("mov %[input2], %%r8\n"
173 "vmmcall"
174 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
175 "+c" (control), "+d" (input1)
176 : [input2] "r" (input2)
177 : "cc", "r8", "r9", "r10", "r11");
178 } else {
179 __asm__ __volatile__("mov %[input2], %%r8\n"
180 CALL_NOSPEC
181 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
182 "+c" (control), "+d" (input1)
183 : [input2] "r" (input2),
184 THUNK_TARGET(hv_hypercall_pg)
185 : "cc", "r8", "r9", "r10", "r11");
186 }
187 #else
188 {
189 u32 input1_hi = upper_32_bits(input1);
190 u32 input1_lo = lower_32_bits(input1);
191 u32 input2_hi = upper_32_bits(input2);
192 u32 input2_lo = lower_32_bits(input2);
193
194 __asm__ __volatile__ (CALL_NOSPEC
195 : "=A"(hv_status),
196 "+c"(input1_lo), ASM_CALL_CONSTRAINT
197 : "A" (control), "b" (input1_hi),
198 "D"(input2_hi), "S"(input2_lo),
199 THUNK_TARGET(hv_hypercall_pg)
200 : "cc");
201 }
202 #endif
203 return hv_status;
204 }
205
hv_do_fast_hypercall16(u16 code,u64 input1,u64 input2)206 static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
207 {
208 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT;
209
210 return _hv_do_fast_hypercall16(control, input1, input2);
211 }
212
213 extern struct hv_vp_assist_page **hv_vp_assist_page;
214
hv_get_vp_assist_page(unsigned int cpu)215 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
216 {
217 if (!hv_vp_assist_page)
218 return NULL;
219
220 return hv_vp_assist_page[cpu];
221 }
222
223 void __init hyperv_init(void);
224 void hyperv_setup_mmu_ops(void);
225 void set_hv_tscchange_cb(void (*cb)(void));
226 void clear_hv_tscchange_cb(void);
227 void hyperv_stop_tsc_emulation(void);
228 int hyperv_flush_guest_mapping(u64 as);
229 int hyperv_flush_guest_mapping_range(u64 as,
230 hyperv_fill_flush_list_func fill_func, void *data);
231 int hyperv_fill_flush_guest_mapping_list(
232 struct hv_guest_mapping_flush_list *flush,
233 u64 start_gfn, u64 end_gfn);
234
235 #ifdef CONFIG_X86_64
236 void hv_apic_init(void);
237 void __init hv_init_spinlocks(void);
238 bool hv_vcpu_is_preempted(int vcpu);
239 #else
hv_apic_init(void)240 static inline void hv_apic_init(void) {}
241 #endif
242
243 struct irq_domain *hv_create_pci_msi_domain(void);
244
245 int hv_map_msi_interrupt(struct irq_data *data,
246 struct hv_interrupt_entry *out_entry);
247 int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector,
248 struct hv_interrupt_entry *entry);
249 int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry);
250
251 #ifdef CONFIG_AMD_MEM_ENCRYPT
252 bool hv_ghcb_negotiate_protocol(void);
253 void __noreturn hv_ghcb_terminate(unsigned int set, unsigned int reason);
254 int hv_snp_boot_ap(u32 apic_id, unsigned long start_ip, unsigned int cpu);
255 #else
hv_ghcb_negotiate_protocol(void)256 static inline bool hv_ghcb_negotiate_protocol(void) { return false; }
hv_ghcb_terminate(unsigned int set,unsigned int reason)257 static inline void hv_ghcb_terminate(unsigned int set, unsigned int reason) {}
hv_snp_boot_ap(u32 apic_id,unsigned long start_ip,unsigned int cpu)258 static inline int hv_snp_boot_ap(u32 apic_id, unsigned long start_ip,
259 unsigned int cpu) { return 0; }
260 #endif
261
262 #if defined(CONFIG_AMD_MEM_ENCRYPT) || defined(CONFIG_INTEL_TDX_GUEST)
263 void hv_vtom_init(void);
264 void hv_ivm_msr_write(u64 msr, u64 value);
265 void hv_ivm_msr_read(u64 msr, u64 *value);
266 #else
hv_vtom_init(void)267 static inline void hv_vtom_init(void) {}
hv_ivm_msr_write(u64 msr,u64 value)268 static inline void hv_ivm_msr_write(u64 msr, u64 value) {}
hv_ivm_msr_read(u64 msr,u64 * value)269 static inline void hv_ivm_msr_read(u64 msr, u64 *value) {}
270 #endif
271
hv_is_synic_msr(unsigned int reg)272 static inline bool hv_is_synic_msr(unsigned int reg)
273 {
274 return (reg >= HV_X64_MSR_SCONTROL) &&
275 (reg <= HV_X64_MSR_SINT15);
276 }
277
hv_is_sint_msr(unsigned int reg)278 static inline bool hv_is_sint_msr(unsigned int reg)
279 {
280 return (reg >= HV_X64_MSR_SINT0) &&
281 (reg <= HV_X64_MSR_SINT15);
282 }
283
284 u64 hv_get_msr(unsigned int reg);
285 void hv_set_msr(unsigned int reg, u64 value);
286 u64 hv_get_non_nested_msr(unsigned int reg);
287 void hv_set_non_nested_msr(unsigned int reg, u64 value);
288
hv_raw_get_msr(unsigned int reg)289 static __always_inline u64 hv_raw_get_msr(unsigned int reg)
290 {
291 return native_rdmsrq(reg);
292 }
293 int hv_apicid_to_vp_index(u32 apic_id);
294
295 #else /* CONFIG_HYPERV */
hyperv_init(void)296 static inline void hyperv_init(void) {}
hyperv_setup_mmu_ops(void)297 static inline void hyperv_setup_mmu_ops(void) {}
set_hv_tscchange_cb(void (* cb)(void))298 static inline void set_hv_tscchange_cb(void (*cb)(void)) {}
clear_hv_tscchange_cb(void)299 static inline void clear_hv_tscchange_cb(void) {}
hyperv_stop_tsc_emulation(void)300 static inline void hyperv_stop_tsc_emulation(void) {};
hv_get_vp_assist_page(unsigned int cpu)301 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
302 {
303 return NULL;
304 }
hyperv_flush_guest_mapping(u64 as)305 static inline int hyperv_flush_guest_mapping(u64 as) { return -1; }
hyperv_flush_guest_mapping_range(u64 as,hyperv_fill_flush_list_func fill_func,void * data)306 static inline int hyperv_flush_guest_mapping_range(u64 as,
307 hyperv_fill_flush_list_func fill_func, void *data)
308 {
309 return -1;
310 }
hv_set_msr(unsigned int reg,u64 value)311 static inline void hv_set_msr(unsigned int reg, u64 value) { }
hv_get_msr(unsigned int reg)312 static inline u64 hv_get_msr(unsigned int reg) { return 0; }
hv_set_non_nested_msr(unsigned int reg,u64 value)313 static inline void hv_set_non_nested_msr(unsigned int reg, u64 value) { }
hv_get_non_nested_msr(unsigned int reg)314 static inline u64 hv_get_non_nested_msr(unsigned int reg) { return 0; }
hv_apicid_to_vp_index(u32 apic_id)315 static inline int hv_apicid_to_vp_index(u32 apic_id) { return -EINVAL; }
316 #endif /* CONFIG_HYPERV */
317
318
319 #ifdef CONFIG_HYPERV_VTL_MODE
320 void __init hv_vtl_init_platform(void);
321 int __init hv_vtl_early_init(void);
322 #else
hv_vtl_init_platform(void)323 static inline void __init hv_vtl_init_platform(void) {}
hv_vtl_early_init(void)324 static inline int __init hv_vtl_early_init(void) { return 0; }
325 #endif
326
327 #include <asm-generic/mshyperv.h>
328
329 #endif
330