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
14 union hv_ghcb;
15
16 DECLARE_STATIC_KEY_FALSE(isolation_type_snp);
17
18 typedef 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
24 void hyperv_vector_handler(struct pt_regs *regs);
25
26 #if IS_ENABLED(CONFIG_HYPERV)
27 extern int hyperv_init_cpuhp;
28
29 extern void *hv_hypercall_pg;
30
31 extern u64 hv_current_partition_id;
32
33 extern union hv_ghcb __percpu **hv_ghcb_pg;
34
35 int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages);
36 int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id);
37 int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags);
38
hv_do_hypercall(u64 control,void * input,void * output)39 static 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 */
hv_do_fast_hypercall8(u16 code,u64 input1)78 static 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 */
hv_do_fast_hypercall16(u16 code,u64 input1,u64 input2)109 static 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
142 extern struct hv_vp_assist_page **hv_vp_assist_page;
143
hv_get_vp_assist_page(unsigned int cpu)144 static 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
152 void __init hyperv_init(void);
153 void hyperv_setup_mmu_ops(void);
154 void set_hv_tscchange_cb(void (*cb)(void));
155 void clear_hv_tscchange_cb(void);
156 void hyperv_stop_tsc_emulation(void);
157 int hyperv_flush_guest_mapping(u64 as);
158 int hyperv_flush_guest_mapping_range(u64 as,
159 hyperv_fill_flush_list_func fill_func, void *data);
160 int 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
165 void hv_apic_init(void);
166 void __init hv_init_spinlocks(void);
167 bool hv_vcpu_is_preempted(int vcpu);
168 #else
hv_apic_init(void)169 static inline void hv_apic_init(void) {}
170 #endif
171
hv_set_msi_entry_from_desc(union hv_msi_entry * msi_entry,struct msi_desc * msi_desc)172 static inline void hv_set_msi_entry_from_desc(union hv_msi_entry *msi_entry,
173 struct msi_desc *msi_desc)
174 {
175 msi_entry->address.as_uint32 = msi_desc->msg.address_lo;
176 msi_entry->data.as_uint32 = msi_desc->msg.data;
177 }
178
179 struct irq_domain *hv_create_pci_msi_domain(void);
180
181 int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector,
182 struct hv_interrupt_entry *entry);
183 int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry);
184 int hv_set_mem_host_visibility(unsigned long addr, int numpages, bool visible);
185
186 #ifdef CONFIG_AMD_MEM_ENCRYPT
187 void hv_ghcb_msr_write(u64 msr, u64 value);
188 void hv_ghcb_msr_read(u64 msr, u64 *value);
189 #else
hv_ghcb_msr_write(u64 msr,u64 value)190 static inline void hv_ghcb_msr_write(u64 msr, u64 value) {}
hv_ghcb_msr_read(u64 msr,u64 * value)191 static inline void hv_ghcb_msr_read(u64 msr, u64 *value) {}
192 #endif
193
194 extern bool hv_isolation_type_snp(void);
195
hv_is_synic_reg(unsigned int reg)196 static inline bool hv_is_synic_reg(unsigned int reg)
197 {
198 if ((reg >= HV_REGISTER_SCONTROL) &&
199 (reg <= HV_REGISTER_SINT15))
200 return true;
201 return false;
202 }
203
hv_get_register(unsigned int reg)204 static inline u64 hv_get_register(unsigned int reg)
205 {
206 u64 value;
207
208 if (hv_is_synic_reg(reg) && hv_isolation_type_snp())
209 hv_ghcb_msr_read(reg, &value);
210 else
211 rdmsrl(reg, value);
212 return value;
213 }
214
hv_set_register(unsigned int reg,u64 value)215 static inline void hv_set_register(unsigned int reg, u64 value)
216 {
217 if (hv_is_synic_reg(reg) && hv_isolation_type_snp()) {
218 hv_ghcb_msr_write(reg, value);
219
220 /* Write proxy bit via wrmsl instruction */
221 if (reg >= HV_REGISTER_SINT0 &&
222 reg <= HV_REGISTER_SINT15)
223 wrmsrl(reg, value | 1 << 20);
224 } else {
225 wrmsrl(reg, value);
226 }
227 }
228
229 #else /* CONFIG_HYPERV */
hyperv_init(void)230 static inline void hyperv_init(void) {}
hyperv_setup_mmu_ops(void)231 static inline void hyperv_setup_mmu_ops(void) {}
set_hv_tscchange_cb(void (* cb)(void))232 static inline void set_hv_tscchange_cb(void (*cb)(void)) {}
clear_hv_tscchange_cb(void)233 static inline void clear_hv_tscchange_cb(void) {}
hyperv_stop_tsc_emulation(void)234 static inline void hyperv_stop_tsc_emulation(void) {};
hv_get_vp_assist_page(unsigned int cpu)235 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
236 {
237 return NULL;
238 }
hyperv_flush_guest_mapping(u64 as)239 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)240 static inline int hyperv_flush_guest_mapping_range(u64 as,
241 hyperv_fill_flush_list_func fill_func, void *data)
242 {
243 return -1;
244 }
hv_set_register(unsigned int reg,u64 value)245 static inline void hv_set_register(unsigned int reg, u64 value) { }
hv_get_register(unsigned int reg)246 static inline u64 hv_get_register(unsigned int reg) { return 0; }
hv_set_mem_host_visibility(unsigned long addr,int numpages,bool visible)247 static inline int hv_set_mem_host_visibility(unsigned long addr, int numpages,
248 bool visible)
249 {
250 return -1;
251 }
252 #endif /* CONFIG_HYPERV */
253
254
255 #include <asm-generic/mshyperv.h>
256
257 #endif
258