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 <linux/static_call.h>
10 #include <asm/nospec-branch.h>
11 #include <asm/paravirt.h>
12 #include <asm/msr.h>
13 #include <hyperv/hvhdk.h>
14
15 /*
16 * Hyper-V always provides a single IO-APIC at this MMIO address.
17 * Ideally, the value should be looked up in ACPI tables, but it
18 * is needed for mapping the IO-APIC early in boot on Confidential
19 * VMs, before ACPI functions can be used.
20 */
21 #define HV_IOAPIC_BASE_ADDRESS 0xfec00000
22
23 #define HV_VTL_NORMAL 0x0
24 #define HV_VTL_SECURE 0x1
25 #define HV_VTL_MGMT 0x2
26
27 union hv_ghcb;
28
29 DECLARE_STATIC_KEY_FALSE(isolation_type_snp);
30 DECLARE_STATIC_KEY_FALSE(isolation_type_tdx);
31
32 typedef int (*hyperv_fill_flush_list_func)(
33 struct hv_guest_mapping_flush_list *flush,
34 void *data);
35
36 void hyperv_vector_handler(struct pt_regs *regs);
37
hv_get_nmi_reason(void)38 static inline unsigned char hv_get_nmi_reason(void)
39 {
40 return 0;
41 }
42
43 extern u64 hv_tdx_hypercall(u64 control, u64 param1, u64 param2);
44 extern u64 hv_snp_hypercall(u64 control, u64 param1, u64 param2);
45 extern u64 hv_std_hypercall(u64 control, u64 param1, u64 param2);
46
47 #if IS_ENABLED(CONFIG_HYPERV)
48 extern void *hv_hypercall_pg;
49
50 extern union hv_ghcb * __percpu *hv_ghcb_pg;
51
52 bool hv_isolation_type_snp(void);
53 bool hv_isolation_type_tdx(void);
54
55 #ifdef CONFIG_X86_64
56 DECLARE_STATIC_CALL(hv_hypercall, hv_std_hypercall);
57 #endif
58
59 /*
60 * DEFAULT INIT GPAT and SEGMENT LIMIT value in struct VMSA
61 * to start AP in enlightened SEV guest.
62 */
63 #define HV_AP_INIT_GPAT_DEFAULT 0x0007040600070406ULL
64 #define HV_AP_SEGMENT_LIMIT 0xffffffff
65
66 /*
67 * If the hypercall involves no input or output parameters, the hypervisor
68 * ignores the corresponding GPA pointer.
69 */
hv_do_hypercall(u64 control,void * input,void * output)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
75 #ifdef CONFIG_X86_64
76 return static_call_mod(hv_hypercall)(control, input_address, output_address);
77 #else
78 u32 input_address_hi = upper_32_bits(input_address);
79 u32 input_address_lo = lower_32_bits(input_address);
80 u32 output_address_hi = upper_32_bits(output_address);
81 u32 output_address_lo = lower_32_bits(output_address);
82 u64 hv_status;
83
84 if (!hv_hypercall_pg)
85 return U64_MAX;
86
87 __asm__ __volatile__(CALL_NOSPEC
88 : "=A" (hv_status),
89 "+c" (input_address_lo), ASM_CALL_CONSTRAINT
90 : "A" (control),
91 "b" (input_address_hi),
92 "D"(output_address_hi), "S"(output_address_lo),
93 THUNK_TARGET(hv_hypercall_pg)
94 : "cc", "memory");
95 return hv_status;
96 #endif /* !x86_64 */
97 }
98
99 /* Fast hypercall with 8 bytes of input and no output */
_hv_do_fast_hypercall8(u64 control,u64 input1)100 static inline u64 _hv_do_fast_hypercall8(u64 control, u64 input1)
101 {
102 #ifdef CONFIG_X86_64
103 return static_call_mod(hv_hypercall)(control, input1, 0);
104 #else
105 u32 input1_hi = upper_32_bits(input1);
106 u32 input1_lo = lower_32_bits(input1);
107 u64 hv_status;
108
109 __asm__ __volatile__ (CALL_NOSPEC
110 : "=A"(hv_status),
111 "+c"(input1_lo),
112 ASM_CALL_CONSTRAINT
113 : "A" (control),
114 "b" (input1_hi),
115 THUNK_TARGET(hv_hypercall_pg)
116 : "cc", "edi", "esi");
117 return hv_status;
118 #endif
119 }
120
hv_do_fast_hypercall8(u16 code,u64 input1)121 static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
122 {
123 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT;
124
125 return _hv_do_fast_hypercall8(control, input1);
126 }
127
128 /* Fast hypercall with 16 bytes of input */
_hv_do_fast_hypercall16(u64 control,u64 input1,u64 input2)129 static inline u64 _hv_do_fast_hypercall16(u64 control, u64 input1, u64 input2)
130 {
131 #ifdef CONFIG_X86_64
132 return static_call_mod(hv_hypercall)(control, input1, input2);
133 #else
134 u32 input1_hi = upper_32_bits(input1);
135 u32 input1_lo = lower_32_bits(input1);
136 u32 input2_hi = upper_32_bits(input2);
137 u32 input2_lo = lower_32_bits(input2);
138 u64 hv_status;
139
140 __asm__ __volatile__ (CALL_NOSPEC
141 : "=A"(hv_status),
142 "+c"(input1_lo), ASM_CALL_CONSTRAINT
143 : "A" (control), "b" (input1_hi),
144 "D"(input2_hi), "S"(input2_lo),
145 THUNK_TARGET(hv_hypercall_pg)
146 : "cc");
147 return hv_status;
148 #endif
149 }
150
hv_do_fast_hypercall16(u16 code,u64 input1,u64 input2)151 static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
152 {
153 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT;
154
155 return _hv_do_fast_hypercall16(control, input1, input2);
156 }
157
158 extern struct hv_vp_assist_page **hv_vp_assist_page;
159
hv_get_vp_assist_page(unsigned int cpu)160 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
161 {
162 if (!hv_vp_assist_page)
163 return NULL;
164
165 return hv_vp_assist_page[cpu];
166 }
167
168 void __init hyperv_init(void);
169 void hyperv_setup_mmu_ops(void);
170 void set_hv_tscchange_cb(void (*cb)(void));
171 void clear_hv_tscchange_cb(void);
172 void hyperv_stop_tsc_emulation(void);
173 int hyperv_flush_guest_mapping(u64 as);
174 int hyperv_flush_guest_mapping_range(u64 as,
175 hyperv_fill_flush_list_func fill_func, void *data);
176 int hyperv_fill_flush_guest_mapping_list(
177 struct hv_guest_mapping_flush_list *flush,
178 u64 start_gfn, u64 end_gfn);
179
180 #ifdef CONFIG_X86_64
181 void hv_apic_init(void);
182 void __init hv_init_spinlocks(void);
183 bool hv_vcpu_is_preempted(int vcpu);
184 #else
hv_apic_init(void)185 static inline void hv_apic_init(void) {}
186 #endif
187
188 struct irq_domain *hv_create_pci_msi_domain(void);
189
190 int hv_map_msi_interrupt(struct irq_data *data,
191 struct hv_interrupt_entry *out_entry);
192 int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector,
193 struct hv_interrupt_entry *entry);
194 int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry);
195
196 #ifdef CONFIG_AMD_MEM_ENCRYPT
197 bool hv_ghcb_negotiate_protocol(void);
198 void __noreturn hv_ghcb_terminate(unsigned int set, unsigned int reason);
199 int hv_snp_boot_ap(u32 apic_id, unsigned long start_ip, unsigned int cpu);
200 #else
hv_ghcb_negotiate_protocol(void)201 static inline bool hv_ghcb_negotiate_protocol(void) { return false; }
hv_ghcb_terminate(unsigned int set,unsigned int reason)202 static inline void hv_ghcb_terminate(unsigned int set, unsigned int reason) {}
hv_snp_boot_ap(u32 apic_id,unsigned long start_ip,unsigned int cpu)203 static inline int hv_snp_boot_ap(u32 apic_id, unsigned long start_ip,
204 unsigned int cpu) { return 0; }
205 #endif
206
207 #if defined(CONFIG_AMD_MEM_ENCRYPT) || defined(CONFIG_INTEL_TDX_GUEST)
208 void hv_vtom_init(void);
209 void hv_ivm_msr_write(u64 msr, u64 value);
210 void hv_ivm_msr_read(u64 msr, u64 *value);
211 #else
hv_vtom_init(void)212 static inline void hv_vtom_init(void) {}
hv_ivm_msr_write(u64 msr,u64 value)213 static inline void hv_ivm_msr_write(u64 msr, u64 value) {}
hv_ivm_msr_read(u64 msr,u64 * value)214 static inline void hv_ivm_msr_read(u64 msr, u64 *value) {}
215 #endif
216
hv_is_synic_msr(unsigned int reg)217 static inline bool hv_is_synic_msr(unsigned int reg)
218 {
219 return (reg >= HV_X64_MSR_SCONTROL) &&
220 (reg <= HV_X64_MSR_SINT15);
221 }
222
hv_is_sint_msr(unsigned int reg)223 static inline bool hv_is_sint_msr(unsigned int reg)
224 {
225 return (reg >= HV_X64_MSR_SINT0) &&
226 (reg <= HV_X64_MSR_SINT15);
227 }
228
229 u64 hv_get_msr(unsigned int reg);
230 void hv_set_msr(unsigned int reg, u64 value);
231 u64 hv_get_non_nested_msr(unsigned int reg);
232 void hv_set_non_nested_msr(unsigned int reg, u64 value);
233
hv_raw_get_msr(unsigned int reg)234 static __always_inline u64 hv_raw_get_msr(unsigned int reg)
235 {
236 return native_rdmsrq(reg);
237 }
238 int hv_apicid_to_vp_index(u32 apic_id);
239
240 #else /* CONFIG_HYPERV */
hyperv_init(void)241 static inline void hyperv_init(void) {}
hyperv_setup_mmu_ops(void)242 static inline void hyperv_setup_mmu_ops(void) {}
set_hv_tscchange_cb(void (* cb)(void))243 static inline void set_hv_tscchange_cb(void (*cb)(void)) {}
clear_hv_tscchange_cb(void)244 static inline void clear_hv_tscchange_cb(void) {}
hyperv_stop_tsc_emulation(void)245 static inline void hyperv_stop_tsc_emulation(void) {};
hv_get_vp_assist_page(unsigned int cpu)246 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
247 {
248 return NULL;
249 }
hyperv_flush_guest_mapping(u64 as)250 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)251 static inline int hyperv_flush_guest_mapping_range(u64 as,
252 hyperv_fill_flush_list_func fill_func, void *data)
253 {
254 return -1;
255 }
hv_set_msr(unsigned int reg,u64 value)256 static inline void hv_set_msr(unsigned int reg, u64 value) { }
hv_get_msr(unsigned int reg)257 static inline u64 hv_get_msr(unsigned int reg) { return 0; }
hv_set_non_nested_msr(unsigned int reg,u64 value)258 static inline void hv_set_non_nested_msr(unsigned int reg, u64 value) { }
hv_get_non_nested_msr(unsigned int reg)259 static inline u64 hv_get_non_nested_msr(unsigned int reg) { return 0; }
hv_apicid_to_vp_index(u32 apic_id)260 static inline int hv_apicid_to_vp_index(u32 apic_id) { return -EINVAL; }
261 #endif /* CONFIG_HYPERV */
262
263
264 #ifdef CONFIG_HYPERV_VTL_MODE
265 void __init hv_vtl_init_platform(void);
266 int __init hv_vtl_early_init(void);
267 #else
hv_vtl_init_platform(void)268 static inline void __init hv_vtl_init_platform(void) {}
hv_vtl_early_init(void)269 static inline int __init hv_vtl_early_init(void) { return 0; }
270 #endif
271
272 #include <asm-generic/mshyperv.h>
273
274 #endif
275