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 int hyperv_init_cpuhp;
44extern bool hyperv_paravisor_present;
45
46extern void *hv_hypercall_pg;
47
48extern u64 hv_current_partition_id;
49
50extern union hv_ghcb * __percpu *hv_ghcb_pg;
51
52bool hv_isolation_type_snp(void);
53bool hv_isolation_type_tdx(void);
54u64 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
63int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages);
64int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id);
65int 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 */
71static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
72{
73 u64 input_address = input ? virt_to_phys(address: input) : 0;
74 u64 output_address = output ? virt_to_phys(address: 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, param1: input_address, param2: 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 */
123static inline u64 hv_do_nested_hypercall(u64 control, void *input, void *output)
124{
125 return hv_do_hypercall(control: control | HV_HYPERCALL_NESTED, input, output);
126}
127
128/* Fast hypercall with 8 bytes of input and no output */
129static 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, param1: input1, param2: 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
168static 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
175static 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 */
183static 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, param1: input1, param2: 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
226static 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
233static 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
240extern struct hv_vp_assist_page **hv_vp_assist_page;
241
242static 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
250void __init hyperv_init(void);
251void hyperv_setup_mmu_ops(void);
252void set_hv_tscchange_cb(void (*cb)(void));
253void clear_hv_tscchange_cb(void);
254void hyperv_stop_tsc_emulation(void);
255int hyperv_flush_guest_mapping(u64 as);
256int hyperv_flush_guest_mapping_range(u64 as,
257 hyperv_fill_flush_list_func fill_func, void *data);
258int 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
263void hv_apic_init(void);
264void __init hv_init_spinlocks(void);
265bool hv_vcpu_is_preempted(int vcpu);
266#else
267static inline void hv_apic_init(void) {}
268#endif
269
270struct irq_domain *hv_create_pci_msi_domain(void);
271
272int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector,
273 struct hv_interrupt_entry *entry);
274int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry);
275
276#ifdef CONFIG_AMD_MEM_ENCRYPT
277bool hv_ghcb_negotiate_protocol(void);
278void __noreturn hv_ghcb_terminate(unsigned int set, unsigned int reason);
279int hv_snp_boot_ap(u32 cpu, unsigned long start_ip);
280#else
281static inline bool hv_ghcb_negotiate_protocol(void) { return false; }
282static inline void hv_ghcb_terminate(unsigned int set, unsigned int reason) {}
283static inline int hv_snp_boot_ap(u32 cpu, unsigned long start_ip) { return 0; }
284#endif
285
286#if defined(CONFIG_AMD_MEM_ENCRYPT) || defined(CONFIG_INTEL_TDX_GUEST)
287void hv_vtom_init(void);
288void hv_ivm_msr_write(u64 msr, u64 value);
289void hv_ivm_msr_read(u64 msr, u64 *value);
290#else
291static inline void hv_vtom_init(void) {}
292static inline void hv_ivm_msr_write(u64 msr, u64 value) {}
293static inline void hv_ivm_msr_read(u64 msr, u64 *value) {}
294#endif
295
296static inline bool hv_is_synic_reg(unsigned int reg)
297{
298 return (reg >= HV_REGISTER_SCONTROL) &&
299 (reg <= HV_REGISTER_SINT15);
300}
301
302static inline bool hv_is_sint_reg(unsigned int reg)
303{
304 return (reg >= HV_REGISTER_SINT0) &&
305 (reg <= HV_REGISTER_SINT15);
306}
307
308u64 hv_get_register(unsigned int reg);
309void hv_set_register(unsigned int reg, u64 value);
310u64 hv_get_non_nested_register(unsigned int reg);
311void hv_set_non_nested_register(unsigned int reg, u64 value);
312
313static __always_inline u64 hv_raw_get_register(unsigned int reg)
314{
315 return __rdmsr(msr: reg);
316}
317
318#else /* CONFIG_HYPERV */
319static inline void hyperv_init(void) {}
320static inline void hyperv_setup_mmu_ops(void) {}
321static inline void set_hv_tscchange_cb(void (*cb)(void)) {}
322static inline void clear_hv_tscchange_cb(void) {}
323static inline void hyperv_stop_tsc_emulation(void) {};
324static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
325{
326 return NULL;
327}
328static inline int hyperv_flush_guest_mapping(u64 as) { return -1; }
329static inline int hyperv_flush_guest_mapping_range(u64 as,
330 hyperv_fill_flush_list_func fill_func, void *data)
331{
332 return -1;
333}
334static inline void hv_set_register(unsigned int reg, u64 value) { }
335static inline u64 hv_get_register(unsigned int reg) { return 0; }
336static inline void hv_set_non_nested_register(unsigned int reg, u64 value) { }
337static inline u64 hv_get_non_nested_register(unsigned int reg) { return 0; }
338#endif /* CONFIG_HYPERV */
339
340
341#ifdef CONFIG_HYPERV_VTL_MODE
342void __init hv_vtl_init_platform(void);
343int __init hv_vtl_early_init(void);
344#else
345static inline void __init hv_vtl_init_platform(void) {}
346static inline int __init hv_vtl_early_init(void) { return 0; }
347#endif
348
349#include <asm-generic/mshyperv.h>
350
351#endif
352

source code of linux/arch/x86/include/asm/mshyperv.h