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 <asm/io.h>
8#include <asm/hyperv-tlfs.h>
9#include <asm/nospec-branch.h>
10
11typedef int (*hyperv_fill_flush_list_func)(
12 struct hv_guest_mapping_flush_list *flush,
13 void *data);
14
15#define hv_init_timer(timer, tick) \
16 wrmsrl(HV_X64_MSR_STIMER0_COUNT + (2*timer), tick)
17#define hv_init_timer_config(timer, val) \
18 wrmsrl(HV_X64_MSR_STIMER0_CONFIG + (2*timer), val)
19
20#define hv_get_simp(val) rdmsrl(HV_X64_MSR_SIMP, val)
21#define hv_set_simp(val) wrmsrl(HV_X64_MSR_SIMP, val)
22
23#define hv_get_siefp(val) rdmsrl(HV_X64_MSR_SIEFP, val)
24#define hv_set_siefp(val) wrmsrl(HV_X64_MSR_SIEFP, val)
25
26#define hv_get_synic_state(val) rdmsrl(HV_X64_MSR_SCONTROL, val)
27#define hv_set_synic_state(val) wrmsrl(HV_X64_MSR_SCONTROL, val)
28
29#define hv_get_vp_index(index) rdmsrl(HV_X64_MSR_VP_INDEX, index)
30
31#define hv_signal_eom() wrmsrl(HV_X64_MSR_EOM, 0)
32
33#define hv_get_synint_state(int_num, val) \
34 rdmsrl(HV_X64_MSR_SINT0 + int_num, val)
35#define hv_set_synint_state(int_num, val) \
36 wrmsrl(HV_X64_MSR_SINT0 + int_num, val)
37
38#define hv_get_crash_ctl(val) \
39 rdmsrl(HV_X64_MSR_CRASH_CTL, val)
40
41#define hv_get_time_ref_count(val) \
42 rdmsrl(HV_X64_MSR_TIME_REF_COUNT, val)
43
44#define hv_get_reference_tsc(val) \
45 rdmsrl(HV_X64_MSR_REFERENCE_TSC, val)
46#define hv_set_reference_tsc(val) \
47 wrmsrl(HV_X64_MSR_REFERENCE_TSC, val)
48#define hv_set_clocksource_vdso(val) \
49 ((val).archdata.vclock_mode = VCLOCK_HVCLOCK)
50#define hv_get_raw_timer() rdtsc_ordered()
51
52void hyperv_callback_vector(void);
53void hyperv_reenlightenment_vector(void);
54#ifdef CONFIG_TRACING
55#define trace_hyperv_callback_vector hyperv_callback_vector
56#endif
57void hyperv_vector_handler(struct pt_regs *regs);
58
59/*
60 * Routines for stimer0 Direct Mode handling.
61 * On x86/x64, there are no percpu actions to take.
62 */
63void hv_stimer0_vector_handler(struct pt_regs *regs);
64void hv_stimer0_callback_vector(void);
65
66static inline void hv_enable_stimer0_percpu_irq(int irq) {}
67static inline void hv_disable_stimer0_percpu_irq(int irq) {}
68
69
70#if IS_ENABLED(CONFIG_HYPERV)
71extern void *hv_hypercall_pg;
72extern void __percpu **hyperv_pcpu_input_arg;
73
74static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
75{
76 u64 input_address = input ? virt_to_phys(input) : 0;
77 u64 output_address = output ? virt_to_phys(output) : 0;
78 u64 hv_status;
79
80#ifdef CONFIG_X86_64
81 if (!hv_hypercall_pg)
82 return U64_MAX;
83
84 __asm__ __volatile__("mov %4, %%r8\n"
85 CALL_NOSPEC
86 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
87 "+c" (control), "+d" (input_address)
88 : "r" (output_address),
89 THUNK_TARGET(hv_hypercall_pg)
90 : "cc", "memory", "r8", "r9", "r10", "r11");
91#else
92 u32 input_address_hi = upper_32_bits(input_address);
93 u32 input_address_lo = lower_32_bits(input_address);
94 u32 output_address_hi = upper_32_bits(output_address);
95 u32 output_address_lo = lower_32_bits(output_address);
96
97 if (!hv_hypercall_pg)
98 return U64_MAX;
99
100 __asm__ __volatile__(CALL_NOSPEC
101 : "=A" (hv_status),
102 "+c" (input_address_lo), ASM_CALL_CONSTRAINT
103 : "A" (control),
104 "b" (input_address_hi),
105 "D"(output_address_hi), "S"(output_address_lo),
106 THUNK_TARGET(hv_hypercall_pg)
107 : "cc", "memory");
108#endif /* !x86_64 */
109 return hv_status;
110}
111
112/* Fast hypercall with 8 bytes of input and no output */
113static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
114{
115 u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;
116
117#ifdef CONFIG_X86_64
118 {
119 __asm__ __volatile__(CALL_NOSPEC
120 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
121 "+c" (control), "+d" (input1)
122 : THUNK_TARGET(hv_hypercall_pg)
123 : "cc", "r8", "r9", "r10", "r11");
124 }
125#else
126 {
127 u32 input1_hi = upper_32_bits(input1);
128 u32 input1_lo = lower_32_bits(input1);
129
130 __asm__ __volatile__ (CALL_NOSPEC
131 : "=A"(hv_status),
132 "+c"(input1_lo),
133 ASM_CALL_CONSTRAINT
134 : "A" (control),
135 "b" (input1_hi),
136 THUNK_TARGET(hv_hypercall_pg)
137 : "cc", "edi", "esi");
138 }
139#endif
140 return hv_status;
141}
142
143/* Fast hypercall with 16 bytes of input */
144static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
145{
146 u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;
147
148#ifdef CONFIG_X86_64
149 {
150 __asm__ __volatile__("mov %4, %%r8\n"
151 CALL_NOSPEC
152 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
153 "+c" (control), "+d" (input1)
154 : "r" (input2),
155 THUNK_TARGET(hv_hypercall_pg)
156 : "cc", "r8", "r9", "r10", "r11");
157 }
158#else
159 {
160 u32 input1_hi = upper_32_bits(input1);
161 u32 input1_lo = lower_32_bits(input1);
162 u32 input2_hi = upper_32_bits(input2);
163 u32 input2_lo = lower_32_bits(input2);
164
165 __asm__ __volatile__ (CALL_NOSPEC
166 : "=A"(hv_status),
167 "+c"(input1_lo), ASM_CALL_CONSTRAINT
168 : "A" (control), "b" (input1_hi),
169 "D"(input2_hi), "S"(input2_lo),
170 THUNK_TARGET(hv_hypercall_pg)
171 : "cc");
172 }
173#endif
174 return hv_status;
175}
176
177/*
178 * Rep hypercalls. Callers of this functions are supposed to ensure that
179 * rep_count and varhead_size comply with Hyper-V hypercall definition.
180 */
181static inline u64 hv_do_rep_hypercall(u16 code, u16 rep_count, u16 varhead_size,
182 void *input, void *output)
183{
184 u64 control = code;
185 u64 status;
186 u16 rep_comp;
187
188 control |= (u64)varhead_size << HV_HYPERCALL_VARHEAD_OFFSET;
189 control |= (u64)rep_count << HV_HYPERCALL_REP_COMP_OFFSET;
190
191 do {
192 status = hv_do_hypercall(control, input, output);
193 if ((status & HV_HYPERCALL_RESULT_MASK) != HV_STATUS_SUCCESS)
194 return status;
195
196 /* Bits 32-43 of status have 'Reps completed' data. */
197 rep_comp = (status & HV_HYPERCALL_REP_COMP_MASK) >>
198 HV_HYPERCALL_REP_COMP_OFFSET;
199
200 control &= ~HV_HYPERCALL_REP_START_MASK;
201 control |= (u64)rep_comp << HV_HYPERCALL_REP_START_OFFSET;
202
203 touch_nmi_watchdog();
204 } while (rep_comp < rep_count);
205
206 return status;
207}
208
209extern struct hv_vp_assist_page **hv_vp_assist_page;
210
211static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
212{
213 if (!hv_vp_assist_page)
214 return NULL;
215
216 return hv_vp_assist_page[cpu];
217}
218
219void __init hyperv_init(void);
220void hyperv_setup_mmu_ops(void);
221void *hv_alloc_hyperv_page(void);
222void *hv_alloc_hyperv_zeroed_page(void);
223void hv_free_hyperv_page(unsigned long addr);
224void hyperv_reenlightenment_intr(struct pt_regs *regs);
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
243#else /* CONFIG_HYPERV */
244static inline void hyperv_init(void) {}
245static inline void hyperv_setup_mmu_ops(void) {}
246static inline void *hv_alloc_hyperv_page(void) { return NULL; }
247static inline void hv_free_hyperv_page(unsigned long addr) {}
248static inline void set_hv_tscchange_cb(void (*cb)(void)) {}
249static inline void clear_hv_tscchange_cb(void) {}
250static inline void hyperv_stop_tsc_emulation(void) {};
251static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
252{
253 return NULL;
254}
255static inline int hyperv_flush_guest_mapping(u64 as) { return -1; }
256static inline int hyperv_flush_guest_mapping_range(u64 as,
257 hyperv_fill_flush_list_func fill_func, void *data)
258{
259 return -1;
260}
261#endif /* CONFIG_HYPERV */
262
263
264#include <asm-generic/mshyperv.h>
265
266#endif