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
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 u64 hv_current_partition_id;
48
49 extern union hv_ghcb * __percpu *hv_ghcb_pg;
50
51 bool hv_isolation_type_snp(void);
52 bool hv_isolation_type_tdx(void);
53 u64 hv_tdx_hypercall(u64 control, u64 param1, u64 param2);
54
55 /*
56 * DEFAULT INIT GPAT and SEGMENT LIMIT value in struct VMSA
57 * to start AP in enlightened SEV guest.
58 */
59 #define HV_AP_INIT_GPAT_DEFAULT 0x0007040600070406ULL
60 #define HV_AP_SEGMENT_LIMIT 0xffffffff
61
62 int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages);
63 int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id);
64 int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags);
65
66 /*
67 * If the hypercall involves no input or output parameters, the hypervisor
68 * ignores the corresponding GPA pointer.
69 */
70 static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
71 {
72 u64 input_address = input ? virt_to_phys(input) : 0;
73 u64 output_address = output ? virt_to_phys(output) : 0;
74 u64 hv_status;
75
76 #ifdef CONFIG_X86_64
77 if (hv_isolation_type_tdx() && !hyperv_paravisor_present)
78 return hv_tdx_hypercall(control, input_address, output_address);
79
80 if (hv_isolation_type_snp() && !hyperv_paravisor_present) {
81 __asm__ __volatile__("mov %4, %%r8\n"
82 "vmmcall"
83 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
84 "+c" (control), "+d" (input_address)
85 : "r" (output_address)
86 : "cc", "memory", "r8", "r9", "r10", "r11");
87 return hv_status;
88 }
89
90 if (!hv_hypercall_pg)
91 return U64_MAX;
92
93 __asm__ __volatile__("mov %4, %%r8\n"
94 CALL_NOSPEC
95 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
96 "+c" (control), "+d" (input_address)
97 : "r" (output_address),
98 THUNK_TARGET(hv_hypercall_pg)
99 : "cc", "memory", "r8", "r9", "r10", "r11");
100 #else
101 u32 input_address_hi = upper_32_bits(input_address);
102 u32 input_address_lo = lower_32_bits(input_address);
103 u32 output_address_hi = upper_32_bits(output_address);
104 u32 output_address_lo = lower_32_bits(output_address);
105
106 if (!hv_hypercall_pg)
107 return U64_MAX;
108
109 __asm__ __volatile__(CALL_NOSPEC
110 : "=A" (hv_status),
111 "+c" (input_address_lo), ASM_CALL_CONSTRAINT
112 : "A" (control),
113 "b" (input_address_hi),
114 "D"(output_address_hi), "S"(output_address_lo),
115 THUNK_TARGET(hv_hypercall_pg)
116 : "cc", "memory");
117 #endif /* !x86_64 */
118 return hv_status;
119 }
120
121 /* Hypercall to the L0 hypervisor */
122 static inline u64 hv_do_nested_hypercall(u64 control, void *input, void *output)
123 {
124 return hv_do_hypercall(control | HV_HYPERCALL_NESTED, input, output);
125 }
126
127 /* Fast hypercall with 8 bytes of input and no output */
128 static inline u64 _hv_do_fast_hypercall8(u64 control, u64 input1)
129 {
130 u64 hv_status;
131
132 #ifdef CONFIG_X86_64
133 if (hv_isolation_type_tdx() && !hyperv_paravisor_present)
134 return hv_tdx_hypercall(control, input1, 0);
135
136 if (hv_isolation_type_snp() && !hyperv_paravisor_present) {
137 __asm__ __volatile__(
138 "vmmcall"
139 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
140 "+c" (control), "+d" (input1)
141 :: "cc", "r8", "r9", "r10", "r11");
142 } else {
143 __asm__ __volatile__(CALL_NOSPEC
144 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
145 "+c" (control), "+d" (input1)
146 : THUNK_TARGET(hv_hypercall_pg)
147 : "cc", "r8", "r9", "r10", "r11");
148 }
149 #else
150 {
151 u32 input1_hi = upper_32_bits(input1);
152 u32 input1_lo = lower_32_bits(input1);
153
154 __asm__ __volatile__ (CALL_NOSPEC
155 : "=A"(hv_status),
156 "+c"(input1_lo),
157 ASM_CALL_CONSTRAINT
158 : "A" (control),
159 "b" (input1_hi),
160 THUNK_TARGET(hv_hypercall_pg)
161 : "cc", "edi", "esi");
162 }
163 #endif
164 return hv_status;
165 }
166
167 static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
168 {
169 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT;
170
171 return _hv_do_fast_hypercall8(control, input1);
172 }
173
174 static inline u64 hv_do_fast_nested_hypercall8(u16 code, u64 input1)
175 {
176 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED;
177
178 return _hv_do_fast_hypercall8(control, input1);
179 }
180
181 /* Fast hypercall with 16 bytes of input */
182 static inline u64 _hv_do_fast_hypercall16(u64 control, u64 input1, u64 input2)
183 {
184 u64 hv_status;
185
186 #ifdef CONFIG_X86_64
187 if (hv_isolation_type_tdx() && !hyperv_paravisor_present)
188 return hv_tdx_hypercall(control, input1, input2);
189
190 if (hv_isolation_type_snp() && !hyperv_paravisor_present) {
191 __asm__ __volatile__("mov %4, %%r8\n"
192 "vmmcall"
193 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
194 "+c" (control), "+d" (input1)
195 : "r" (input2)
196 : "cc", "r8", "r9", "r10", "r11");
197 } else {
198 __asm__ __volatile__("mov %4, %%r8\n"
199 CALL_NOSPEC
200 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
201 "+c" (control), "+d" (input1)
202 : "r" (input2),
203 THUNK_TARGET(hv_hypercall_pg)
204 : "cc", "r8", "r9", "r10", "r11");
205 }
206 #else
207 {
208 u32 input1_hi = upper_32_bits(input1);
209 u32 input1_lo = lower_32_bits(input1);
210 u32 input2_hi = upper_32_bits(input2);
211 u32 input2_lo = lower_32_bits(input2);
212
213 __asm__ __volatile__ (CALL_NOSPEC
214 : "=A"(hv_status),
215 "+c"(input1_lo), ASM_CALL_CONSTRAINT
216 : "A" (control), "b" (input1_hi),
217 "D"(input2_hi), "S"(input2_lo),
218 THUNK_TARGET(hv_hypercall_pg)
219 : "cc");
220 }
221 #endif
222 return hv_status;
223 }
224
225 static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
226 {
227 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT;
228
229 return _hv_do_fast_hypercall16(control, input1, input2);
230 }
231
232 static inline u64 hv_do_fast_nested_hypercall16(u16 code, u64 input1, u64 input2)
233 {
234 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED;
235
236 return _hv_do_fast_hypercall16(control, input1, input2);
237 }
238
239 extern struct hv_vp_assist_page **hv_vp_assist_page;
240
241 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
242 {
243 if (!hv_vp_assist_page)
244 return NULL;
245
246 return hv_vp_assist_page[cpu];
247 }
248
249 void __init hyperv_init(void);
250 void hyperv_setup_mmu_ops(void);
251 void set_hv_tscchange_cb(void (*cb)(void));
252 void clear_hv_tscchange_cb(void);
253 void hyperv_stop_tsc_emulation(void);
254 int hyperv_flush_guest_mapping(u64 as);
255 int hyperv_flush_guest_mapping_range(u64 as,
256 hyperv_fill_flush_list_func fill_func, void *data);
257 int hyperv_fill_flush_guest_mapping_list(
258 struct hv_guest_mapping_flush_list *flush,
259 u64 start_gfn, u64 end_gfn);
260
261 #ifdef CONFIG_X86_64
262 void hv_apic_init(void);
263 void __init hv_init_spinlocks(void);
264 bool hv_vcpu_is_preempted(int vcpu);
265 #else
266 static inline void hv_apic_init(void) {}
267 #endif
268
269 struct irq_domain *hv_create_pci_msi_domain(void);
270
271 int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector,
272 struct hv_interrupt_entry *entry);
273 int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry);
274
275 #ifdef CONFIG_AMD_MEM_ENCRYPT
276 bool hv_ghcb_negotiate_protocol(void);
277 void __noreturn hv_ghcb_terminate(unsigned int set, unsigned int reason);
278 int hv_snp_boot_ap(u32 cpu, unsigned long start_ip);
279 #else
280 static inline bool hv_ghcb_negotiate_protocol(void) { return false; }
281 static inline void hv_ghcb_terminate(unsigned int set, unsigned int reason) {}
282 static inline int hv_snp_boot_ap(u32 cpu, unsigned long start_ip) { return 0; }
283 #endif
284
285 #if defined(CONFIG_AMD_MEM_ENCRYPT) || defined(CONFIG_INTEL_TDX_GUEST)
286 void hv_vtom_init(void);
287 void hv_ivm_msr_write(u64 msr, u64 value);
288 void hv_ivm_msr_read(u64 msr, u64 *value);
289 #else
290 static inline void hv_vtom_init(void) {}
291 static inline void hv_ivm_msr_write(u64 msr, u64 value) {}
292 static inline void hv_ivm_msr_read(u64 msr, u64 *value) {}
293 #endif
294
295 static inline bool hv_is_synic_msr(unsigned int reg)
296 {
297 return (reg >= HV_X64_MSR_SCONTROL) &&
298 (reg <= HV_X64_MSR_SINT15);
299 }
300
301 static inline bool hv_is_sint_msr(unsigned int reg)
302 {
303 return (reg >= HV_X64_MSR_SINT0) &&
304 (reg <= HV_X64_MSR_SINT15);
305 }
306
307 u64 hv_get_msr(unsigned int reg);
308 void hv_set_msr(unsigned int reg, u64 value);
309 u64 hv_get_non_nested_msr(unsigned int reg);
310 void hv_set_non_nested_msr(unsigned int reg, u64 value);
311
312 static __always_inline u64 hv_raw_get_msr(unsigned int reg)
313 {
314 return __rdmsr(reg);
315 }
316
317 #else /* CONFIG_HYPERV */
318 static inline void hyperv_init(void) {}
319 static inline void hyperv_setup_mmu_ops(void) {}
320 static inline void set_hv_tscchange_cb(void (*cb)(void)) {}
321 static inline void clear_hv_tscchange_cb(void) {}
322 static inline void hyperv_stop_tsc_emulation(void) {};
323 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
324 {
325 return NULL;
326 }
327 static inline int hyperv_flush_guest_mapping(u64 as) { return -1; }
328 static inline int hyperv_flush_guest_mapping_range(u64 as,
329 hyperv_fill_flush_list_func fill_func, void *data)
330 {
331 return -1;
332 }
333 static inline void hv_set_msr(unsigned int reg, u64 value) { }
334 static inline u64 hv_get_msr(unsigned int reg) { return 0; }
335 static inline void hv_set_non_nested_msr(unsigned int reg, u64 value) { }
336 static inline u64 hv_get_non_nested_msr(unsigned int reg) { return 0; }
337 #endif /* CONFIG_HYPERV */
338
339
340 #ifdef CONFIG_HYPERV_VTL_MODE
341 void __init hv_vtl_init_platform(void);
342 int __init hv_vtl_early_init(void);
343 #else
344 static inline void __init hv_vtl_init_platform(void) {}
345 static inline int __init hv_vtl_early_init(void) { return 0; }
346 #endif
347
348 #include <asm-generic/mshyperv.h>
349
350 #endif
351
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