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#include <asm/fpu/types.h>
15
16/*
17 * Hyper-V always provides a single IO-APIC at this MMIO address.
18 * Ideally, the value should be looked up in ACPI tables, but it
19 * is needed for mapping the IO-APIC early in boot on Confidential
20 * VMs, before ACPI functions can be used.
21 */
22#define HV_IOAPIC_BASE_ADDRESS 0xfec00000
23
24#define HV_VTL_NORMAL 0x0
25#define HV_VTL_SECURE 0x1
26#define HV_VTL_MGMT 0x2
27
28union hv_ghcb;
29
30DECLARE_STATIC_KEY_FALSE(isolation_type_snp);
31DECLARE_STATIC_KEY_FALSE(isolation_type_tdx);
32
33typedef int (*hyperv_fill_flush_list_func)(
34 struct hv_guest_mapping_flush_list *flush,
35 void *data);
36
37void hyperv_vector_handler(struct pt_regs *regs);
38
39static inline unsigned char hv_get_nmi_reason(void)
40{
41 return 0;
42}
43
44extern u64 hv_tdx_hypercall(u64 control, u64 param1, u64 param2);
45extern u64 hv_snp_hypercall(u64 control, u64 param1, u64 param2);
46extern u64 hv_std_hypercall(u64 control, u64 param1, u64 param2);
47
48#if IS_ENABLED(CONFIG_HYPERV)
49extern void *hv_hypercall_pg;
50
51extern union hv_ghcb * __percpu *hv_ghcb_pg;
52
53bool hv_isolation_type_snp(void);
54bool hv_isolation_type_tdx(void);
55
56#ifdef CONFIG_X86_64
57DECLARE_STATIC_CALL(hv_hypercall, hv_std_hypercall);
58#endif
59
60/*
61 * DEFAULT INIT GPAT and SEGMENT LIMIT value in struct VMSA
62 * to start AP in enlightened SEV guest.
63 */
64#define HV_AP_INIT_GPAT_DEFAULT 0x0007040600070406ULL
65#define HV_AP_SEGMENT_LIMIT 0xffffffff
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
76#ifdef CONFIG_X86_64
77 return static_call_mod(hv_hypercall)(control, input_address, output_address);
78#else
79 u32 input_address_hi = upper_32_bits(input_address);
80 u32 input_address_lo = lower_32_bits(input_address);
81 u32 output_address_hi = upper_32_bits(output_address);
82 u32 output_address_lo = lower_32_bits(output_address);
83 u64 hv_status;
84
85 if (!hv_hypercall_pg)
86 return U64_MAX;
87
88 __asm__ __volatile__(CALL_NOSPEC
89 : "=A" (hv_status),
90 "+c" (input_address_lo), ASM_CALL_CONSTRAINT
91 : "A" (control),
92 "b" (input_address_hi),
93 "D"(output_address_hi), "S"(output_address_lo),
94 THUNK_TARGET(hv_hypercall_pg)
95 : "cc", "memory");
96 return hv_status;
97#endif /* !x86_64 */
98}
99
100/* Fast hypercall with 8 bytes of input and no output */
101static inline u64 _hv_do_fast_hypercall8(u64 control, u64 input1)
102{
103#ifdef CONFIG_X86_64
104 return static_call_mod(hv_hypercall)(control, input1, 0);
105#else
106 u32 input1_hi = upper_32_bits(input1);
107 u32 input1_lo = lower_32_bits(input1);
108 u64 hv_status;
109
110 __asm__ __volatile__ (CALL_NOSPEC
111 : "=A"(hv_status),
112 "+c"(input1_lo),
113 ASM_CALL_CONSTRAINT
114 : "A" (control),
115 "b" (input1_hi),
116 THUNK_TARGET(hv_hypercall_pg)
117 : "cc", "edi", "esi");
118 return hv_status;
119#endif
120}
121
122static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
123{
124 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT;
125
126 return _hv_do_fast_hypercall8(control, input1);
127}
128
129/* Fast hypercall with 16 bytes of input */
130static inline u64 _hv_do_fast_hypercall16(u64 control, u64 input1, u64 input2)
131{
132#ifdef CONFIG_X86_64
133 return static_call_mod(hv_hypercall)(control, input1, input2);
134#else
135 u32 input1_hi = upper_32_bits(input1);
136 u32 input1_lo = lower_32_bits(input1);
137 u32 input2_hi = upper_32_bits(input2);
138 u32 input2_lo = lower_32_bits(input2);
139 u64 hv_status;
140
141 __asm__ __volatile__ (CALL_NOSPEC
142 : "=A"(hv_status),
143 "+c"(input1_lo), ASM_CALL_CONSTRAINT
144 : "A" (control), "b" (input1_hi),
145 "D"(input2_hi), "S"(input2_lo),
146 THUNK_TARGET(hv_hypercall_pg)
147 : "cc");
148 return hv_status;
149#endif
150}
151
152static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
153{
154 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT;
155
156 return _hv_do_fast_hypercall16(control, input1, input2);
157}
158
159extern struct hv_vp_assist_page **hv_vp_assist_page;
160
161static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
162{
163 if (!hv_vp_assist_page)
164 return NULL;
165
166 return hv_vp_assist_page[cpu];
167}
168
169void __init hyperv_init(void);
170void hyperv_setup_mmu_ops(void);
171void set_hv_tscchange_cb(void (*cb)(void));
172void clear_hv_tscchange_cb(void);
173void hyperv_stop_tsc_emulation(void);
174int hyperv_flush_guest_mapping(u64 as);
175int hyperv_flush_guest_mapping_range(u64 as,
176 hyperv_fill_flush_list_func fill_func, void *data);
177int hyperv_fill_flush_guest_mapping_list(
178 struct hv_guest_mapping_flush_list *flush,
179 u64 start_gfn, u64 end_gfn);
180void hv_sleep_notifiers_register(void);
181void hv_machine_power_off(void);
182
183#ifdef CONFIG_X86_64
184void hv_apic_init(void);
185void __init hv_init_spinlocks(void);
186bool hv_vcpu_is_preempted(int vcpu);
187#else
188static inline void hv_apic_init(void) {}
189#endif
190
191struct irq_domain *hv_create_pci_msi_domain(void);
192
193int hv_map_msi_interrupt(struct irq_data *data,
194 struct hv_interrupt_entry *out_entry);
195int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector,
196 struct hv_interrupt_entry *entry);
197int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry);
198
199#ifdef CONFIG_AMD_MEM_ENCRYPT
200bool hv_ghcb_negotiate_protocol(void);
201void __noreturn hv_ghcb_terminate(unsigned int set, unsigned int reason);
202int hv_snp_boot_ap(u32 apic_id, unsigned long start_ip, unsigned int cpu);
203#else
204static inline bool hv_ghcb_negotiate_protocol(void) { return false; }
205static inline void hv_ghcb_terminate(unsigned int set, unsigned int reason) {}
206static inline int hv_snp_boot_ap(u32 apic_id, unsigned long start_ip,
207 unsigned int cpu) { return 0; }
208#endif
209
210#if defined(CONFIG_AMD_MEM_ENCRYPT) || defined(CONFIG_INTEL_TDX_GUEST)
211void hv_vtom_init(void);
212void hv_ivm_msr_write(u64 msr, u64 value);
213void hv_ivm_msr_read(u64 msr, u64 *value);
214#else
215static inline void hv_vtom_init(void) {}
216static inline void hv_ivm_msr_write(u64 msr, u64 value) {}
217static inline void hv_ivm_msr_read(u64 msr, u64 *value) {}
218#endif
219
220static inline bool hv_is_synic_msr(unsigned int reg)
221{
222 return (reg >= HV_X64_MSR_SCONTROL) &&
223 (reg <= HV_X64_MSR_SINT15);
224}
225
226static inline bool hv_is_sint_msr(unsigned int reg)
227{
228 return (reg >= HV_X64_MSR_SINT0) &&
229 (reg <= HV_X64_MSR_SINT15);
230}
231
232u64 hv_get_msr(unsigned int reg);
233void hv_set_msr(unsigned int reg, u64 value);
234u64 hv_get_non_nested_msr(unsigned int reg);
235void hv_set_non_nested_msr(unsigned int reg, u64 value);
236
237static __always_inline u64 hv_raw_get_msr(unsigned int reg)
238{
239 return native_rdmsrq(msr: reg);
240}
241int hv_apicid_to_vp_index(u32 apic_id);
242
243#if IS_ENABLED(CONFIG_MSHV_ROOT) && IS_ENABLED(CONFIG_CRASH_DUMP)
244void hv_root_crash_init(void);
245void hv_crash_asm32(void);
246void hv_crash_asm64(void);
247void hv_crash_asm_end(void);
248#else /* CONFIG_MSHV_ROOT && CONFIG_CRASH_DUMP */
249static inline void hv_root_crash_init(void) {}
250#endif /* CONFIG_MSHV_ROOT && CONFIG_CRASH_DUMP */
251
252#else /* CONFIG_HYPERV */
253static inline void hyperv_init(void) {}
254static inline void hyperv_setup_mmu_ops(void) {}
255static inline void set_hv_tscchange_cb(void (*cb)(void)) {}
256static inline void clear_hv_tscchange_cb(void) {}
257static inline void hyperv_stop_tsc_emulation(void) {};
258static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
259{
260 return NULL;
261}
262static inline int hyperv_flush_guest_mapping(u64 as) { return -1; }
263static inline int hyperv_flush_guest_mapping_range(u64 as,
264 hyperv_fill_flush_list_func fill_func, void *data)
265{
266 return -1;
267}
268static inline void hv_set_msr(unsigned int reg, u64 value) { }
269static inline u64 hv_get_msr(unsigned int reg) { return 0; }
270static inline void hv_set_non_nested_msr(unsigned int reg, u64 value) { }
271static inline u64 hv_get_non_nested_msr(unsigned int reg) { return 0; }
272static inline int hv_apicid_to_vp_index(u32 apic_id) { return -EINVAL; }
273#endif /* CONFIG_HYPERV */
274
275struct mshv_vtl_cpu_context {
276 union {
277 struct {
278 u64 rax;
279 u64 rcx;
280 u64 rdx;
281 u64 rbx;
282 u64 cr2;
283 u64 rbp;
284 u64 rsi;
285 u64 rdi;
286 u64 r8;
287 u64 r9;
288 u64 r10;
289 u64 r11;
290 u64 r12;
291 u64 r13;
292 u64 r14;
293 u64 r15;
294 };
295 u64 gp_regs[16];
296 };
297
298 struct fxregs_state fx_state;
299};
300
301#ifdef CONFIG_HYPERV_VTL_MODE
302void __init hv_vtl_init_platform(void);
303int __init hv_vtl_early_init(void);
304void mshv_vtl_return_call(struct mshv_vtl_cpu_context *vtl0);
305void mshv_vtl_return_call_init(u64 vtl_return_offset);
306void mshv_vtl_return_hypercall(void);
307void __mshv_vtl_return_call(struct mshv_vtl_cpu_context *vtl0);
308#else
309static inline void __init hv_vtl_init_platform(void) {}
310static inline int __init hv_vtl_early_init(void) { return 0; }
311static inline void mshv_vtl_return_call(struct mshv_vtl_cpu_context *vtl0) {}
312static inline void mshv_vtl_return_call_init(u64 vtl_return_offset) {}
313static inline void mshv_vtl_return_hypercall(void) {}
314static inline void __mshv_vtl_return_call(struct mshv_vtl_cpu_context *vtl0) {}
315#endif
316
317#include <asm-generic/mshyperv.h>
318
319#endif
320

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