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/hyperv-tlfs.h>
10 #include <asm/nospec-branch.h>
11 #include <asm/paravirt.h>
12 #include <asm/mshyperv.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 int hyperv_init_cpuhp;
44 extern bool hyperv_paravisor_present;
45
46 extern void *hv_hypercall_pg;
47
48 extern u64 hv_current_partition_id;
49
50 extern union hv_ghcb * __percpu *hv_ghcb_pg;
51
52 bool hv_isolation_type_snp(void);
53 bool hv_isolation_type_tdx(void);
54 u64 hv_tdx_hypercall(u64 control, u64 param1, u64 param2);
55
56 /*
57 * DEFAULT INIT GPAT and SEGMENT LIMIT value in struct VMSA
58 * to start AP in enlightened SEV guest.
59 */
60 #define HV_AP_INIT_GPAT_DEFAULT 0x0007040600070406ULL
61 #define HV_AP_SEGMENT_LIMIT 0xffffffff
62
63 int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages);
64 int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id);
65 int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags);
66
67 /*
68 * If the hypercall involves no input or output parameters, the hypervisor
69 * ignores the corresponding GPA pointer.
70 */
hv_do_hypercall(u64 control,void * input,void * output)71 static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
72 {
73 u64 input_address = input ? virt_to_phys(input) : 0;
74 u64 output_address = output ? virt_to_phys(output) : 0;
75 u64 hv_status;
76
77 #ifdef CONFIG_X86_64
78 if (hv_isolation_type_tdx() && !hyperv_paravisor_present)
79 return hv_tdx_hypercall(control, input_address, output_address);
80
81 if (hv_isolation_type_snp() && !hyperv_paravisor_present) {
82 __asm__ __volatile__("mov %4, %%r8\n"
83 "vmmcall"
84 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
85 "+c" (control), "+d" (input_address)
86 : "r" (output_address)
87 : "cc", "memory", "r8", "r9", "r10", "r11");
88 return hv_status;
89 }
90
91 if (!hv_hypercall_pg)
92 return U64_MAX;
93
94 __asm__ __volatile__("mov %4, %%r8\n"
95 CALL_NOSPEC
96 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
97 "+c" (control), "+d" (input_address)
98 : "r" (output_address),
99 THUNK_TARGET(hv_hypercall_pg)
100 : "cc", "memory", "r8", "r9", "r10", "r11");
101 #else
102 u32 input_address_hi = upper_32_bits(input_address);
103 u32 input_address_lo = lower_32_bits(input_address);
104 u32 output_address_hi = upper_32_bits(output_address);
105 u32 output_address_lo = lower_32_bits(output_address);
106
107 if (!hv_hypercall_pg)
108 return U64_MAX;
109
110 __asm__ __volatile__(CALL_NOSPEC
111 : "=A" (hv_status),
112 "+c" (input_address_lo), ASM_CALL_CONSTRAINT
113 : "A" (control),
114 "b" (input_address_hi),
115 "D"(output_address_hi), "S"(output_address_lo),
116 THUNK_TARGET(hv_hypercall_pg)
117 : "cc", "memory");
118 #endif /* !x86_64 */
119 return hv_status;
120 }
121
122 /* Hypercall to the L0 hypervisor */
hv_do_nested_hypercall(u64 control,void * input,void * output)123 static inline u64 hv_do_nested_hypercall(u64 control, void *input, void *output)
124 {
125 return hv_do_hypercall(control | HV_HYPERCALL_NESTED, input, output);
126 }
127
128 /* Fast hypercall with 8 bytes of input and no output */
_hv_do_fast_hypercall8(u64 control,u64 input1)129 static inline u64 _hv_do_fast_hypercall8(u64 control, u64 input1)
130 {
131 u64 hv_status;
132
133 #ifdef CONFIG_X86_64
134 if (hv_isolation_type_tdx() && !hyperv_paravisor_present)
135 return hv_tdx_hypercall(control, input1, 0);
136
137 if (hv_isolation_type_snp() && !hyperv_paravisor_present) {
138 __asm__ __volatile__(
139 "vmmcall"
140 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
141 "+c" (control), "+d" (input1)
142 :: "cc", "r8", "r9", "r10", "r11");
143 } else {
144 __asm__ __volatile__(CALL_NOSPEC
145 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
146 "+c" (control), "+d" (input1)
147 : THUNK_TARGET(hv_hypercall_pg)
148 : "cc", "r8", "r9", "r10", "r11");
149 }
150 #else
151 {
152 u32 input1_hi = upper_32_bits(input1);
153 u32 input1_lo = lower_32_bits(input1);
154
155 __asm__ __volatile__ (CALL_NOSPEC
156 : "=A"(hv_status),
157 "+c"(input1_lo),
158 ASM_CALL_CONSTRAINT
159 : "A" (control),
160 "b" (input1_hi),
161 THUNK_TARGET(hv_hypercall_pg)
162 : "cc", "edi", "esi");
163 }
164 #endif
165 return hv_status;
166 }
167
hv_do_fast_hypercall8(u16 code,u64 input1)168 static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
169 {
170 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT;
171
172 return _hv_do_fast_hypercall8(control, input1);
173 }
174
hv_do_fast_nested_hypercall8(u16 code,u64 input1)175 static inline u64 hv_do_fast_nested_hypercall8(u16 code, u64 input1)
176 {
177 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED;
178
179 return _hv_do_fast_hypercall8(control, input1);
180 }
181
182 /* Fast hypercall with 16 bytes of input */
_hv_do_fast_hypercall16(u64 control,u64 input1,u64 input2)183 static inline u64 _hv_do_fast_hypercall16(u64 control, u64 input1, u64 input2)
184 {
185 u64 hv_status;
186
187 #ifdef CONFIG_X86_64
188 if (hv_isolation_type_tdx() && !hyperv_paravisor_present)
189 return hv_tdx_hypercall(control, input1, input2);
190
191 if (hv_isolation_type_snp() && !hyperv_paravisor_present) {
192 __asm__ __volatile__("mov %4, %%r8\n"
193 "vmmcall"
194 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
195 "+c" (control), "+d" (input1)
196 : "r" (input2)
197 : "cc", "r8", "r9", "r10", "r11");
198 } else {
199 __asm__ __volatile__("mov %4, %%r8\n"
200 CALL_NOSPEC
201 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
202 "+c" (control), "+d" (input1)
203 : "r" (input2),
204 THUNK_TARGET(hv_hypercall_pg)
205 : "cc", "r8", "r9", "r10", "r11");
206 }
207 #else
208 {
209 u32 input1_hi = upper_32_bits(input1);
210 u32 input1_lo = lower_32_bits(input1);
211 u32 input2_hi = upper_32_bits(input2);
212 u32 input2_lo = lower_32_bits(input2);
213
214 __asm__ __volatile__ (CALL_NOSPEC
215 : "=A"(hv_status),
216 "+c"(input1_lo), ASM_CALL_CONSTRAINT
217 : "A" (control), "b" (input1_hi),
218 "D"(input2_hi), "S"(input2_lo),
219 THUNK_TARGET(hv_hypercall_pg)
220 : "cc");
221 }
222 #endif
223 return hv_status;
224 }
225
hv_do_fast_hypercall16(u16 code,u64 input1,u64 input2)226 static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
227 {
228 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT;
229
230 return _hv_do_fast_hypercall16(control, input1, input2);
231 }
232
hv_do_fast_nested_hypercall16(u16 code,u64 input1,u64 input2)233 static inline u64 hv_do_fast_nested_hypercall16(u16 code, u64 input1, u64 input2)
234 {
235 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED;
236
237 return _hv_do_fast_hypercall16(control, input1, input2);
238 }
239
240 extern struct hv_vp_assist_page **hv_vp_assist_page;
241
hv_get_vp_assist_page(unsigned int cpu)242 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
243 {
244 if (!hv_vp_assist_page)
245 return NULL;
246
247 return hv_vp_assist_page[cpu];
248 }
249
250 void __init hyperv_init(void);
251 void hyperv_setup_mmu_ops(void);
252 void set_hv_tscchange_cb(void (*cb)(void));
253 void clear_hv_tscchange_cb(void);
254 void hyperv_stop_tsc_emulation(void);
255 int hyperv_flush_guest_mapping(u64 as);
256 int hyperv_flush_guest_mapping_range(u64 as,
257 hyperv_fill_flush_list_func fill_func, void *data);
258 int hyperv_fill_flush_guest_mapping_list(
259 struct hv_guest_mapping_flush_list *flush,
260 u64 start_gfn, u64 end_gfn);
261
262 #ifdef CONFIG_X86_64
263 void hv_apic_init(void);
264 void __init hv_init_spinlocks(void);
265 bool hv_vcpu_is_preempted(int vcpu);
266 #else
hv_apic_init(void)267 static inline void hv_apic_init(void) {}
268 #endif
269
270 struct irq_domain *hv_create_pci_msi_domain(void);
271
272 int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector,
273 struct hv_interrupt_entry *entry);
274 int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry);
275
276 #ifdef CONFIG_AMD_MEM_ENCRYPT
277 bool hv_ghcb_negotiate_protocol(void);
278 void __noreturn hv_ghcb_terminate(unsigned int set, unsigned int reason);
279 int hv_snp_boot_ap(int cpu, unsigned long start_ip);
280 #else
hv_ghcb_negotiate_protocol(void)281 static inline bool hv_ghcb_negotiate_protocol(void) { return false; }
hv_ghcb_terminate(unsigned int set,unsigned int reason)282 static inline void hv_ghcb_terminate(unsigned int set, unsigned int reason) {}
hv_snp_boot_ap(int cpu,unsigned long start_ip)283 static inline int hv_snp_boot_ap(int cpu, unsigned long start_ip) { return 0; }
284 #endif
285
286 #if defined(CONFIG_AMD_MEM_ENCRYPT) || defined(CONFIG_INTEL_TDX_GUEST)
287 void hv_vtom_init(void);
288 void hv_ivm_msr_write(u64 msr, u64 value);
289 void hv_ivm_msr_read(u64 msr, u64 *value);
290 #else
hv_vtom_init(void)291 static inline void hv_vtom_init(void) {}
hv_ivm_msr_write(u64 msr,u64 value)292 static inline void hv_ivm_msr_write(u64 msr, u64 value) {}
hv_ivm_msr_read(u64 msr,u64 * value)293 static inline void hv_ivm_msr_read(u64 msr, u64 *value) {}
294 #endif
295
hv_is_synic_reg(unsigned int reg)296 static inline bool hv_is_synic_reg(unsigned int reg)
297 {
298 return (reg >= HV_REGISTER_SCONTROL) &&
299 (reg <= HV_REGISTER_SINT15);
300 }
301
hv_is_sint_reg(unsigned int reg)302 static inline bool hv_is_sint_reg(unsigned int reg)
303 {
304 return (reg >= HV_REGISTER_SINT0) &&
305 (reg <= HV_REGISTER_SINT15);
306 }
307
308 u64 hv_get_register(unsigned int reg);
309 void hv_set_register(unsigned int reg, u64 value);
310 u64 hv_get_non_nested_register(unsigned int reg);
311 void hv_set_non_nested_register(unsigned int reg, u64 value);
312
hv_raw_get_register(unsigned int reg)313 static __always_inline u64 hv_raw_get_register(unsigned int reg)
314 {
315 return __rdmsr(reg);
316 }
317
318 #else /* CONFIG_HYPERV */
hyperv_init(void)319 static inline void hyperv_init(void) {}
hyperv_setup_mmu_ops(void)320 static inline void hyperv_setup_mmu_ops(void) {}
set_hv_tscchange_cb(void (* cb)(void))321 static inline void set_hv_tscchange_cb(void (*cb)(void)) {}
clear_hv_tscchange_cb(void)322 static inline void clear_hv_tscchange_cb(void) {}
hyperv_stop_tsc_emulation(void)323 static inline void hyperv_stop_tsc_emulation(void) {};
hv_get_vp_assist_page(unsigned int cpu)324 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
325 {
326 return NULL;
327 }
hyperv_flush_guest_mapping(u64 as)328 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)329 static inline int hyperv_flush_guest_mapping_range(u64 as,
330 hyperv_fill_flush_list_func fill_func, void *data)
331 {
332 return -1;
333 }
hv_set_register(unsigned int reg,u64 value)334 static inline void hv_set_register(unsigned int reg, u64 value) { }
hv_get_register(unsigned int reg)335 static inline u64 hv_get_register(unsigned int reg) { return 0; }
hv_set_non_nested_register(unsigned int reg,u64 value)336 static inline void hv_set_non_nested_register(unsigned int reg, u64 value) { }
hv_get_non_nested_register(unsigned int reg)337 static inline u64 hv_get_non_nested_register(unsigned int reg) { return 0; }
338 #endif /* CONFIG_HYPERV */
339
340
341 #ifdef CONFIG_HYPERV_VTL_MODE
342 void __init hv_vtl_init_platform(void);
343 int __init hv_vtl_early_init(void);
344 #else
hv_vtl_init_platform(void)345 static inline void __init hv_vtl_init_platform(void) {}
hv_vtl_early_init(void)346 static inline int __init hv_vtl_early_init(void) { return 0; }
347 #endif
348
349 #include <asm-generic/mshyperv.h>
350
351 #endif
352