Linux kernel mirror (for testing)
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linux
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 <asm/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
14union hv_ghcb;
15
16DECLARE_STATIC_KEY_FALSE(isolation_type_snp);
17
18typedef int (*hyperv_fill_flush_list_func)(
19 struct hv_guest_mapping_flush_list *flush,
20 void *data);
21
22#define hv_get_raw_timer() rdtsc_ordered()
23
24void hyperv_vector_handler(struct pt_regs *regs);
25
26#if IS_ENABLED(CONFIG_HYPERV)
27extern int hyperv_init_cpuhp;
28
29extern void *hv_hypercall_pg;
30
31extern u64 hv_current_partition_id;
32
33extern union hv_ghcb * __percpu *hv_ghcb_pg;
34
35int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages);
36int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id);
37int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags);
38
39static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
40{
41 u64 input_address = input ? virt_to_phys(input) : 0;
42 u64 output_address = output ? virt_to_phys(output) : 0;
43 u64 hv_status;
44
45#ifdef CONFIG_X86_64
46 if (!hv_hypercall_pg)
47 return U64_MAX;
48
49 __asm__ __volatile__("mov %4, %%r8\n"
50 CALL_NOSPEC
51 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
52 "+c" (control), "+d" (input_address)
53 : "r" (output_address),
54 THUNK_TARGET(hv_hypercall_pg)
55 : "cc", "memory", "r8", "r9", "r10", "r11");
56#else
57 u32 input_address_hi = upper_32_bits(input_address);
58 u32 input_address_lo = lower_32_bits(input_address);
59 u32 output_address_hi = upper_32_bits(output_address);
60 u32 output_address_lo = lower_32_bits(output_address);
61
62 if (!hv_hypercall_pg)
63 return U64_MAX;
64
65 __asm__ __volatile__(CALL_NOSPEC
66 : "=A" (hv_status),
67 "+c" (input_address_lo), ASM_CALL_CONSTRAINT
68 : "A" (control),
69 "b" (input_address_hi),
70 "D"(output_address_hi), "S"(output_address_lo),
71 THUNK_TARGET(hv_hypercall_pg)
72 : "cc", "memory");
73#endif /* !x86_64 */
74 return hv_status;
75}
76
77/* Fast hypercall with 8 bytes of input and no output */
78static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
79{
80 u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;
81
82#ifdef CONFIG_X86_64
83 {
84 __asm__ __volatile__(CALL_NOSPEC
85 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
86 "+c" (control), "+d" (input1)
87 : THUNK_TARGET(hv_hypercall_pg)
88 : "cc", "r8", "r9", "r10", "r11");
89 }
90#else
91 {
92 u32 input1_hi = upper_32_bits(input1);
93 u32 input1_lo = lower_32_bits(input1);
94
95 __asm__ __volatile__ (CALL_NOSPEC
96 : "=A"(hv_status),
97 "+c"(input1_lo),
98 ASM_CALL_CONSTRAINT
99 : "A" (control),
100 "b" (input1_hi),
101 THUNK_TARGET(hv_hypercall_pg)
102 : "cc", "edi", "esi");
103 }
104#endif
105 return hv_status;
106}
107
108/* Fast hypercall with 16 bytes of input */
109static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
110{
111 u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;
112
113#ifdef CONFIG_X86_64
114 {
115 __asm__ __volatile__("mov %4, %%r8\n"
116 CALL_NOSPEC
117 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
118 "+c" (control), "+d" (input1)
119 : "r" (input2),
120 THUNK_TARGET(hv_hypercall_pg)
121 : "cc", "r8", "r9", "r10", "r11");
122 }
123#else
124 {
125 u32 input1_hi = upper_32_bits(input1);
126 u32 input1_lo = lower_32_bits(input1);
127 u32 input2_hi = upper_32_bits(input2);
128 u32 input2_lo = lower_32_bits(input2);
129
130 __asm__ __volatile__ (CALL_NOSPEC
131 : "=A"(hv_status),
132 "+c"(input1_lo), ASM_CALL_CONSTRAINT
133 : "A" (control), "b" (input1_hi),
134 "D"(input2_hi), "S"(input2_lo),
135 THUNK_TARGET(hv_hypercall_pg)
136 : "cc");
137 }
138#endif
139 return hv_status;
140}
141
142extern struct hv_vp_assist_page **hv_vp_assist_page;
143
144static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
145{
146 if (!hv_vp_assist_page)
147 return NULL;
148
149 return hv_vp_assist_page[cpu];
150}
151
152void __init hyperv_init(void);
153void hyperv_setup_mmu_ops(void);
154void set_hv_tscchange_cb(void (*cb)(void));
155void clear_hv_tscchange_cb(void);
156void hyperv_stop_tsc_emulation(void);
157int hyperv_flush_guest_mapping(u64 as);
158int hyperv_flush_guest_mapping_range(u64 as,
159 hyperv_fill_flush_list_func fill_func, void *data);
160int hyperv_fill_flush_guest_mapping_list(
161 struct hv_guest_mapping_flush_list *flush,
162 u64 start_gfn, u64 end_gfn);
163
164#ifdef CONFIG_X86_64
165void hv_apic_init(void);
166void __init hv_init_spinlocks(void);
167bool hv_vcpu_is_preempted(int vcpu);
168#else
169static inline void hv_apic_init(void) {}
170#endif
171
172struct irq_domain *hv_create_pci_msi_domain(void);
173
174int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector,
175 struct hv_interrupt_entry *entry);
176int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry);
177int hv_set_mem_host_visibility(unsigned long addr, int numpages, bool visible);
178
179#ifdef CONFIG_AMD_MEM_ENCRYPT
180void hv_ghcb_msr_write(u64 msr, u64 value);
181void hv_ghcb_msr_read(u64 msr, u64 *value);
182bool hv_ghcb_negotiate_protocol(void);
183void hv_ghcb_terminate(unsigned int set, unsigned int reason);
184#else
185static inline void hv_ghcb_msr_write(u64 msr, u64 value) {}
186static inline void hv_ghcb_msr_read(u64 msr, u64 *value) {}
187static inline bool hv_ghcb_negotiate_protocol(void) { return false; }
188static inline void hv_ghcb_terminate(unsigned int set, unsigned int reason) {}
189#endif
190
191extern bool hv_isolation_type_snp(void);
192
193static inline bool hv_is_synic_reg(unsigned int reg)
194{
195 if ((reg >= HV_REGISTER_SCONTROL) &&
196 (reg <= HV_REGISTER_SINT15))
197 return true;
198 return false;
199}
200
201static inline u64 hv_get_register(unsigned int reg)
202{
203 u64 value;
204
205 if (hv_is_synic_reg(reg) && hv_isolation_type_snp())
206 hv_ghcb_msr_read(reg, &value);
207 else
208 rdmsrl(reg, value);
209 return value;
210}
211
212static inline void hv_set_register(unsigned int reg, u64 value)
213{
214 if (hv_is_synic_reg(reg) && hv_isolation_type_snp()) {
215 hv_ghcb_msr_write(reg, value);
216
217 /* Write proxy bit via wrmsl instruction */
218 if (reg >= HV_REGISTER_SINT0 &&
219 reg <= HV_REGISTER_SINT15)
220 wrmsrl(reg, value | 1 << 20);
221 } else {
222 wrmsrl(reg, value);
223 }
224}
225
226#else /* CONFIG_HYPERV */
227static inline void hyperv_init(void) {}
228static inline void hyperv_setup_mmu_ops(void) {}
229static inline void set_hv_tscchange_cb(void (*cb)(void)) {}
230static inline void clear_hv_tscchange_cb(void) {}
231static inline void hyperv_stop_tsc_emulation(void) {};
232static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
233{
234 return NULL;
235}
236static inline int hyperv_flush_guest_mapping(u64 as) { return -1; }
237static inline int hyperv_flush_guest_mapping_range(u64 as,
238 hyperv_fill_flush_list_func fill_func, void *data)
239{
240 return -1;
241}
242static inline void hv_set_register(unsigned int reg, u64 value) { }
243static inline u64 hv_get_register(unsigned int reg) { return 0; }
244static inline int hv_set_mem_host_visibility(unsigned long addr, int numpages,
245 bool visible)
246{
247 return -1;
248}
249#endif /* CONFIG_HYPERV */
250
251
252#include <asm-generic/mshyperv.h>
253
254#endif