Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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 <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
14typedef int (*hyperv_fill_flush_list_func)(
15 struct hv_guest_mapping_flush_list *flush,
16 void *data);
17
18static inline void hv_set_register(unsigned int reg, u64 value)
19{
20 wrmsrl(reg, value);
21}
22
23static inline u64 hv_get_register(unsigned int reg)
24{
25 u64 value;
26
27 rdmsrl(reg, value);
28 return value;
29}
30
31#define hv_get_raw_timer() rdtsc_ordered()
32
33void hyperv_vector_handler(struct pt_regs *regs);
34
35#if IS_ENABLED(CONFIG_HYPERV)
36extern int hyperv_init_cpuhp;
37
38extern void *hv_hypercall_pg;
39extern void __percpu **hyperv_pcpu_input_arg;
40extern void __percpu **hyperv_pcpu_output_arg;
41
42extern u64 hv_current_partition_id;
43
44int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages);
45int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id);
46int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags);
47
48static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
49{
50 u64 input_address = input ? virt_to_phys(input) : 0;
51 u64 output_address = output ? virt_to_phys(output) : 0;
52 u64 hv_status;
53
54#ifdef CONFIG_X86_64
55 if (!hv_hypercall_pg)
56 return U64_MAX;
57
58 __asm__ __volatile__("mov %4, %%r8\n"
59 CALL_NOSPEC
60 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
61 "+c" (control), "+d" (input_address)
62 : "r" (output_address),
63 THUNK_TARGET(hv_hypercall_pg)
64 : "cc", "memory", "r8", "r9", "r10", "r11");
65#else
66 u32 input_address_hi = upper_32_bits(input_address);
67 u32 input_address_lo = lower_32_bits(input_address);
68 u32 output_address_hi = upper_32_bits(output_address);
69 u32 output_address_lo = lower_32_bits(output_address);
70
71 if (!hv_hypercall_pg)
72 return U64_MAX;
73
74 __asm__ __volatile__(CALL_NOSPEC
75 : "=A" (hv_status),
76 "+c" (input_address_lo), ASM_CALL_CONSTRAINT
77 : "A" (control),
78 "b" (input_address_hi),
79 "D"(output_address_hi), "S"(output_address_lo),
80 THUNK_TARGET(hv_hypercall_pg)
81 : "cc", "memory");
82#endif /* !x86_64 */
83 return hv_status;
84}
85
86/* Fast hypercall with 8 bytes of input and no output */
87static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
88{
89 u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;
90
91#ifdef CONFIG_X86_64
92 {
93 __asm__ __volatile__(CALL_NOSPEC
94 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
95 "+c" (control), "+d" (input1)
96 : THUNK_TARGET(hv_hypercall_pg)
97 : "cc", "r8", "r9", "r10", "r11");
98 }
99#else
100 {
101 u32 input1_hi = upper_32_bits(input1);
102 u32 input1_lo = lower_32_bits(input1);
103
104 __asm__ __volatile__ (CALL_NOSPEC
105 : "=A"(hv_status),
106 "+c"(input1_lo),
107 ASM_CALL_CONSTRAINT
108 : "A" (control),
109 "b" (input1_hi),
110 THUNK_TARGET(hv_hypercall_pg)
111 : "cc", "edi", "esi");
112 }
113#endif
114 return hv_status;
115}
116
117/* Fast hypercall with 16 bytes of input */
118static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
119{
120 u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;
121
122#ifdef CONFIG_X86_64
123 {
124 __asm__ __volatile__("mov %4, %%r8\n"
125 CALL_NOSPEC
126 : "=a" (hv_status), ASM_CALL_CONSTRAINT,
127 "+c" (control), "+d" (input1)
128 : "r" (input2),
129 THUNK_TARGET(hv_hypercall_pg)
130 : "cc", "r8", "r9", "r10", "r11");
131 }
132#else
133 {
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
139 __asm__ __volatile__ (CALL_NOSPEC
140 : "=A"(hv_status),
141 "+c"(input1_lo), ASM_CALL_CONSTRAINT
142 : "A" (control), "b" (input1_hi),
143 "D"(input2_hi), "S"(input2_lo),
144 THUNK_TARGET(hv_hypercall_pg)
145 : "cc");
146 }
147#endif
148 return hv_status;
149}
150
151extern struct hv_vp_assist_page **hv_vp_assist_page;
152
153static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
154{
155 if (!hv_vp_assist_page)
156 return NULL;
157
158 return hv_vp_assist_page[cpu];
159}
160
161void __init hyperv_init(void);
162void hyperv_setup_mmu_ops(void);
163void set_hv_tscchange_cb(void (*cb)(void));
164void clear_hv_tscchange_cb(void);
165void hyperv_stop_tsc_emulation(void);
166int hyperv_flush_guest_mapping(u64 as);
167int hyperv_flush_guest_mapping_range(u64 as,
168 hyperv_fill_flush_list_func fill_func, void *data);
169int hyperv_fill_flush_guest_mapping_list(
170 struct hv_guest_mapping_flush_list *flush,
171 u64 start_gfn, u64 end_gfn);
172
173extern bool hv_root_partition;
174
175#ifdef CONFIG_X86_64
176void hv_apic_init(void);
177void __init hv_init_spinlocks(void);
178bool hv_vcpu_is_preempted(int vcpu);
179#else
180static inline void hv_apic_init(void) {}
181#endif
182
183static inline void hv_set_msi_entry_from_desc(union hv_msi_entry *msi_entry,
184 struct msi_desc *msi_desc)
185{
186 msi_entry->address.as_uint32 = msi_desc->msg.address_lo;
187 msi_entry->data.as_uint32 = msi_desc->msg.data;
188}
189
190struct irq_domain *hv_create_pci_msi_domain(void);
191
192int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector,
193 struct hv_interrupt_entry *entry);
194int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry);
195
196#else /* CONFIG_HYPERV */
197static inline void hyperv_init(void) {}
198static inline void hyperv_setup_mmu_ops(void) {}
199static inline void set_hv_tscchange_cb(void (*cb)(void)) {}
200static inline void clear_hv_tscchange_cb(void) {}
201static inline void hyperv_stop_tsc_emulation(void) {};
202static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
203{
204 return NULL;
205}
206static inline int hyperv_flush_guest_mapping(u64 as) { return -1; }
207static inline int hyperv_flush_guest_mapping_range(u64 as,
208 hyperv_fill_flush_list_func fill_func, void *data)
209{
210 return -1;
211}
212#endif /* CONFIG_HYPERV */
213
214
215#include <asm-generic/mshyperv.h>
216
217#endif