Linux kernel mirror (for testing)
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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
26union hv_ghcb;
27
28DECLARE_STATIC_KEY_FALSE(isolation_type_snp);
29DECLARE_STATIC_KEY_FALSE(isolation_type_tdx);
30
31typedef int (*hyperv_fill_flush_list_func)(
32 struct hv_guest_mapping_flush_list *flush,
33 void *data);
34
35void hyperv_vector_handler(struct pt_regs *regs);
36
37static inline unsigned char hv_get_nmi_reason(void)
38{
39 return 0;
40}
41
42#if IS_ENABLED(CONFIG_HYPERV)
43extern bool hyperv_paravisor_present;
44
45extern void *hv_hypercall_pg;
46
47extern u64 hv_current_partition_id;
48
49extern union hv_ghcb * __percpu *hv_ghcb_pg;
50
51bool hv_isolation_type_snp(void);
52bool hv_isolation_type_tdx(void);
53u64 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
62int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages);
63int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id);
64int 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 */
70static 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 */
122static 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 */
128static 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
167static 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
174static 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 */
182static 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
225static 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
232static 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
239extern struct hv_vp_assist_page **hv_vp_assist_page;
240
241static 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
249void __init hyperv_init(void);
250void hyperv_setup_mmu_ops(void);
251void set_hv_tscchange_cb(void (*cb)(void));
252void clear_hv_tscchange_cb(void);
253void hyperv_stop_tsc_emulation(void);
254int hyperv_flush_guest_mapping(u64 as);
255int hyperv_flush_guest_mapping_range(u64 as,
256 hyperv_fill_flush_list_func fill_func, void *data);
257int 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
262void hv_apic_init(void);
263void __init hv_init_spinlocks(void);
264bool hv_vcpu_is_preempted(int vcpu);
265#else
266static inline void hv_apic_init(void) {}
267#endif
268
269struct irq_domain *hv_create_pci_msi_domain(void);
270
271int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector,
272 struct hv_interrupt_entry *entry);
273int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry);
274
275#ifdef CONFIG_AMD_MEM_ENCRYPT
276bool hv_ghcb_negotiate_protocol(void);
277void __noreturn hv_ghcb_terminate(unsigned int set, unsigned int reason);
278int hv_snp_boot_ap(u32 cpu, unsigned long start_ip);
279#else
280static inline bool hv_ghcb_negotiate_protocol(void) { return false; }
281static inline void hv_ghcb_terminate(unsigned int set, unsigned int reason) {}
282static 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)
286void hv_vtom_init(void);
287void hv_ivm_msr_write(u64 msr, u64 value);
288void hv_ivm_msr_read(u64 msr, u64 *value);
289#else
290static inline void hv_vtom_init(void) {}
291static inline void hv_ivm_msr_write(u64 msr, u64 value) {}
292static inline void hv_ivm_msr_read(u64 msr, u64 *value) {}
293#endif
294
295static 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
301static 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
307u64 hv_get_msr(unsigned int reg);
308void hv_set_msr(unsigned int reg, u64 value);
309u64 hv_get_non_nested_msr(unsigned int reg);
310void hv_set_non_nested_msr(unsigned int reg, u64 value);
311
312static __always_inline u64 hv_raw_get_msr(unsigned int reg)
313{
314 return __rdmsr(reg);
315}
316
317#else /* CONFIG_HYPERV */
318static inline void hyperv_init(void) {}
319static inline void hyperv_setup_mmu_ops(void) {}
320static inline void set_hv_tscchange_cb(void (*cb)(void)) {}
321static inline void clear_hv_tscchange_cb(void) {}
322static inline void hyperv_stop_tsc_emulation(void) {};
323static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
324{
325 return NULL;
326}
327static inline int hyperv_flush_guest_mapping(u64 as) { return -1; }
328static inline int hyperv_flush_guest_mapping_range(u64 as,
329 hyperv_fill_flush_list_func fill_func, void *data)
330{
331 return -1;
332}
333static inline void hv_set_msr(unsigned int reg, u64 value) { }
334static inline u64 hv_get_msr(unsigned int reg) { return 0; }
335static inline void hv_set_non_nested_msr(unsigned int reg, u64 value) { }
336static inline u64 hv_get_non_nested_msr(unsigned int reg) { return 0; }
337#endif /* CONFIG_HYPERV */
338
339
340#ifdef CONFIG_HYPERV_VTL_MODE
341void __init hv_vtl_init_platform(void);
342int __init hv_vtl_early_init(void);
343#else
344static inline void __init hv_vtl_init_platform(void) {}
345static inline int __init hv_vtl_early_init(void) { return 0; }
346#endif
347
348#include <asm-generic/mshyperv.h>
349
350#endif