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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/nospec-branch.h>
10#include <asm/paravirt.h>
11#include <asm/msr.h>
12#include <hyperv/hvhdk.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 union hv_ghcb * __percpu *hv_ghcb_pg;
48
49bool hv_isolation_type_snp(void);
50bool hv_isolation_type_tdx(void);
51u64 hv_tdx_hypercall(u64 control, u64 param1, u64 param2);
52
53/*
54 * DEFAULT INIT GPAT and SEGMENT LIMIT value in struct VMSA
55 * to start AP in enlightened SEV guest.
56 */
57#define HV_AP_INIT_GPAT_DEFAULT 0x0007040600070406ULL
58#define HV_AP_SEGMENT_LIMIT 0xffffffff
59
60/*
61 * If the hypercall involves no input or output parameters, the hypervisor
62 * ignores the corresponding GPA pointer.
63 */
64static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
65{
66 u64 input_address = input ? virt_to_phys(input) : 0;
67 u64 output_address = output ? virt_to_phys(output) : 0;
68 u64 hv_status;
69
70#ifdef CONFIG_X86_64
71 if (hv_isolation_type_tdx() && !hyperv_paravisor_present)
72 return hv_tdx_hypercall(control, input_address, output_address);
73
74 if (hv_isolation_type_snp() && !hyperv_paravisor_present) {
75 __asm__ __volatile__("mov %[output_address], %%r8\n"
76 "vmmcall"
77 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
78 "+c" (control), "+d" (input_address)
79 : [output_address] "r" (output_address)
80 : "cc", "memory", "r8", "r9", "r10", "r11");
81 return hv_status;
82 }
83
84 if (!hv_hypercall_pg)
85 return U64_MAX;
86
87 __asm__ __volatile__("mov %[output_address], %%r8\n"
88 CALL_NOSPEC
89 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
90 "+c" (control), "+d" (input_address)
91 : [output_address] "r" (output_address),
92 THUNK_TARGET(hv_hypercall_pg)
93 : "cc", "memory", "r8", "r9", "r10", "r11");
94#else
95 u32 input_address_hi = upper_32_bits(input_address);
96 u32 input_address_lo = lower_32_bits(input_address);
97 u32 output_address_hi = upper_32_bits(output_address);
98 u32 output_address_lo = lower_32_bits(output_address);
99
100 if (!hv_hypercall_pg)
101 return U64_MAX;
102
103 __asm__ __volatile__(CALL_NOSPEC
104 : "=A" (hv_status),
105 "+c" (input_address_lo), ASM_CALL_CONSTRAINT
106 : "A" (control),
107 "b" (input_address_hi),
108 "D"(output_address_hi), "S"(output_address_lo),
109 THUNK_TARGET(hv_hypercall_pg)
110 : "cc", "memory");
111#endif /* !x86_64 */
112 return hv_status;
113}
114
115/* Fast hypercall with 8 bytes of input and no output */
116static inline u64 _hv_do_fast_hypercall8(u64 control, u64 input1)
117{
118 u64 hv_status;
119
120#ifdef CONFIG_X86_64
121 if (hv_isolation_type_tdx() && !hyperv_paravisor_present)
122 return hv_tdx_hypercall(control, input1, 0);
123
124 if (hv_isolation_type_snp() && !hyperv_paravisor_present) {
125 __asm__ __volatile__(
126 "vmmcall"
127 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
128 "+c" (control), "+d" (input1)
129 :: "cc", "r8", "r9", "r10", "r11");
130 } else {
131 __asm__ __volatile__(CALL_NOSPEC
132 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
133 "+c" (control), "+d" (input1)
134 : THUNK_TARGET(hv_hypercall_pg)
135 : "cc", "r8", "r9", "r10", "r11");
136 }
137#else
138 {
139 u32 input1_hi = upper_32_bits(input1);
140 u32 input1_lo = lower_32_bits(input1);
141
142 __asm__ __volatile__ (CALL_NOSPEC
143 : "=A"(hv_status),
144 "+c"(input1_lo),
145 ASM_CALL_CONSTRAINT
146 : "A" (control),
147 "b" (input1_hi),
148 THUNK_TARGET(hv_hypercall_pg)
149 : "cc", "edi", "esi");
150 }
151#endif
152 return hv_status;
153}
154
155static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
156{
157 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT;
158
159 return _hv_do_fast_hypercall8(control, input1);
160}
161
162/* Fast hypercall with 16 bytes of input */
163static inline u64 _hv_do_fast_hypercall16(u64 control, u64 input1, u64 input2)
164{
165 u64 hv_status;
166
167#ifdef CONFIG_X86_64
168 if (hv_isolation_type_tdx() && !hyperv_paravisor_present)
169 return hv_tdx_hypercall(control, input1, input2);
170
171 if (hv_isolation_type_snp() && !hyperv_paravisor_present) {
172 __asm__ __volatile__("mov %[input2], %%r8\n"
173 "vmmcall"
174 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
175 "+c" (control), "+d" (input1)
176 : [input2] "r" (input2)
177 : "cc", "r8", "r9", "r10", "r11");
178 } else {
179 __asm__ __volatile__("mov %[input2], %%r8\n"
180 CALL_NOSPEC
181 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
182 "+c" (control), "+d" (input1)
183 : [input2] "r" (input2),
184 THUNK_TARGET(hv_hypercall_pg)
185 : "cc", "r8", "r9", "r10", "r11");
186 }
187#else
188 {
189 u32 input1_hi = upper_32_bits(input1);
190 u32 input1_lo = lower_32_bits(input1);
191 u32 input2_hi = upper_32_bits(input2);
192 u32 input2_lo = lower_32_bits(input2);
193
194 __asm__ __volatile__ (CALL_NOSPEC
195 : "=A"(hv_status),
196 "+c"(input1_lo), ASM_CALL_CONSTRAINT
197 : "A" (control), "b" (input1_hi),
198 "D"(input2_hi), "S"(input2_lo),
199 THUNK_TARGET(hv_hypercall_pg)
200 : "cc");
201 }
202#endif
203 return hv_status;
204}
205
206static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
207{
208 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT;
209
210 return _hv_do_fast_hypercall16(control, input1, input2);
211}
212
213extern struct hv_vp_assist_page **hv_vp_assist_page;
214
215static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
216{
217 if (!hv_vp_assist_page)
218 return NULL;
219
220 return hv_vp_assist_page[cpu];
221}
222
223void __init hyperv_init(void);
224void hyperv_setup_mmu_ops(void);
225void set_hv_tscchange_cb(void (*cb)(void));
226void clear_hv_tscchange_cb(void);
227void hyperv_stop_tsc_emulation(void);
228int hyperv_flush_guest_mapping(u64 as);
229int hyperv_flush_guest_mapping_range(u64 as,
230 hyperv_fill_flush_list_func fill_func, void *data);
231int hyperv_fill_flush_guest_mapping_list(
232 struct hv_guest_mapping_flush_list *flush,
233 u64 start_gfn, u64 end_gfn);
234
235#ifdef CONFIG_X86_64
236void hv_apic_init(void);
237void __init hv_init_spinlocks(void);
238bool hv_vcpu_is_preempted(int vcpu);
239#else
240static inline void hv_apic_init(void) {}
241#endif
242
243struct irq_domain *hv_create_pci_msi_domain(void);
244
245int hv_map_msi_interrupt(struct irq_data *data,
246 struct hv_interrupt_entry *out_entry);
247int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector,
248 struct hv_interrupt_entry *entry);
249int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry);
250
251#ifdef CONFIG_AMD_MEM_ENCRYPT
252bool hv_ghcb_negotiate_protocol(void);
253void __noreturn hv_ghcb_terminate(unsigned int set, unsigned int reason);
254int hv_snp_boot_ap(u32 apic_id, unsigned long start_ip, unsigned int cpu);
255#else
256static inline bool hv_ghcb_negotiate_protocol(void) { return false; }
257static inline void hv_ghcb_terminate(unsigned int set, unsigned int reason) {}
258static inline int hv_snp_boot_ap(u32 apic_id, unsigned long start_ip,
259 unsigned int cpu) { return 0; }
260#endif
261
262#if defined(CONFIG_AMD_MEM_ENCRYPT) || defined(CONFIG_INTEL_TDX_GUEST)
263void hv_vtom_init(void);
264void hv_ivm_msr_write(u64 msr, u64 value);
265void hv_ivm_msr_read(u64 msr, u64 *value);
266#else
267static inline void hv_vtom_init(void) {}
268static inline void hv_ivm_msr_write(u64 msr, u64 value) {}
269static inline void hv_ivm_msr_read(u64 msr, u64 *value) {}
270#endif
271
272static inline bool hv_is_synic_msr(unsigned int reg)
273{
274 return (reg >= HV_X64_MSR_SCONTROL) &&
275 (reg <= HV_X64_MSR_SINT15);
276}
277
278static inline bool hv_is_sint_msr(unsigned int reg)
279{
280 return (reg >= HV_X64_MSR_SINT0) &&
281 (reg <= HV_X64_MSR_SINT15);
282}
283
284u64 hv_get_msr(unsigned int reg);
285void hv_set_msr(unsigned int reg, u64 value);
286u64 hv_get_non_nested_msr(unsigned int reg);
287void hv_set_non_nested_msr(unsigned int reg, u64 value);
288
289static __always_inline u64 hv_raw_get_msr(unsigned int reg)
290{
291 return native_rdmsrq(reg);
292}
293int hv_apicid_to_vp_index(u32 apic_id);
294
295#else /* CONFIG_HYPERV */
296static inline void hyperv_init(void) {}
297static inline void hyperv_setup_mmu_ops(void) {}
298static inline void set_hv_tscchange_cb(void (*cb)(void)) {}
299static inline void clear_hv_tscchange_cb(void) {}
300static inline void hyperv_stop_tsc_emulation(void) {};
301static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
302{
303 return NULL;
304}
305static inline int hyperv_flush_guest_mapping(u64 as) { return -1; }
306static inline int hyperv_flush_guest_mapping_range(u64 as,
307 hyperv_fill_flush_list_func fill_func, void *data)
308{
309 return -1;
310}
311static inline void hv_set_msr(unsigned int reg, u64 value) { }
312static inline u64 hv_get_msr(unsigned int reg) { return 0; }
313static inline void hv_set_non_nested_msr(unsigned int reg, u64 value) { }
314static inline u64 hv_get_non_nested_msr(unsigned int reg) { return 0; }
315static inline int hv_apicid_to_vp_index(u32 apic_id) { return -EINVAL; }
316#endif /* CONFIG_HYPERV */
317
318
319#ifdef CONFIG_HYPERV_VTL_MODE
320void __init hv_vtl_init_platform(void);
321int __init hv_vtl_early_init(void);
322#else
323static inline void __init hv_vtl_init_platform(void) {}
324static inline int __init hv_vtl_early_init(void) { return 0; }
325#endif
326
327#include <asm-generic/mshyperv.h>
328
329#endif