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
13typedef int (*hyperv_fill_flush_list_func)(
14		struct hv_guest_mapping_flush_list *flush,
15		void *data);
16
17#define hv_init_timer(timer, tick) \
18	wrmsrl(HV_X64_MSR_STIMER0_COUNT + (2*timer), tick)
19#define hv_init_timer_config(timer, val) \
20	wrmsrl(HV_X64_MSR_STIMER0_CONFIG + (2*timer), val)
21
22#define hv_get_simp(val) rdmsrl(HV_X64_MSR_SIMP, val)
23#define hv_set_simp(val) wrmsrl(HV_X64_MSR_SIMP, val)
24
25#define hv_get_siefp(val) rdmsrl(HV_X64_MSR_SIEFP, val)
26#define hv_set_siefp(val) wrmsrl(HV_X64_MSR_SIEFP, val)
27
28#define hv_get_synic_state(val) rdmsrl(HV_X64_MSR_SCONTROL, val)
29#define hv_set_synic_state(val) wrmsrl(HV_X64_MSR_SCONTROL, val)
30
31#define hv_get_vp_index(index) rdmsrl(HV_X64_MSR_VP_INDEX, index)
32
33#define hv_signal_eom() wrmsrl(HV_X64_MSR_EOM, 0)
34
35#define hv_get_synint_state(int_num, val) \
36	rdmsrl(HV_X64_MSR_SINT0 + int_num, val)
37#define hv_set_synint_state(int_num, val) \
38	wrmsrl(HV_X64_MSR_SINT0 + int_num, val)
39#define hv_recommend_using_aeoi() \
40	(!(ms_hyperv.hints & HV_DEPRECATING_AEOI_RECOMMENDED))
41
42#define hv_get_crash_ctl(val) \
43	rdmsrl(HV_X64_MSR_CRASH_CTL, val)
44
45#define hv_get_time_ref_count(val) \
46	rdmsrl(HV_X64_MSR_TIME_REF_COUNT, val)
47
48#define hv_get_reference_tsc(val) \
49	rdmsrl(HV_X64_MSR_REFERENCE_TSC, val)
50#define hv_set_reference_tsc(val) \
51	wrmsrl(HV_X64_MSR_REFERENCE_TSC, val)
52#define hv_set_clocksource_vdso(val) \
53	((val).vdso_clock_mode = VDSO_CLOCKMODE_HVCLOCK)
54#define hv_enable_vdso_clocksource() \
55	vclocks_set_used(VDSO_CLOCKMODE_HVCLOCK);
56#define hv_get_raw_timer() rdtsc_ordered()
57#define hv_get_vector() HYPERVISOR_CALLBACK_VECTOR
58
59/*
60 * Reference to pv_ops must be inline so objtool
61 * detection of noinstr violations can work correctly.
62 */
63static __always_inline void hv_setup_sched_clock(void *sched_clock)
64{
65#ifdef CONFIG_PARAVIRT
66	pv_ops.time.sched_clock = sched_clock;
67#endif
68}
69
70void hyperv_vector_handler(struct pt_regs *regs);
71
72static inline void hv_enable_stimer0_percpu_irq(int irq) {}
73static inline void hv_disable_stimer0_percpu_irq(int irq) {}
74
75
76#if IS_ENABLED(CONFIG_HYPERV)
77extern int hyperv_init_cpuhp;
78
79extern void *hv_hypercall_pg;
80extern void  __percpu  **hyperv_pcpu_input_arg;
81
82static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
83{
84	u64 input_address = input ? virt_to_phys(input) : 0;
85	u64 output_address = output ? virt_to_phys(output) : 0;
86	u64 hv_status;
87
88#ifdef CONFIG_X86_64
89	if (!hv_hypercall_pg)
90		return U64_MAX;
91
92	__asm__ __volatile__("mov %4, %%r8\n"
93			     CALL_NOSPEC
94			     : "=a" (hv_status), ASM_CALL_CONSTRAINT,
95			       "+c" (control), "+d" (input_address)
96			     :  "r" (output_address),
97				THUNK_TARGET(hv_hypercall_pg)
98			     : "cc", "memory", "r8", "r9", "r10", "r11");
99#else
100	u32 input_address_hi = upper_32_bits(input_address);
101	u32 input_address_lo = lower_32_bits(input_address);
102	u32 output_address_hi = upper_32_bits(output_address);
103	u32 output_address_lo = lower_32_bits(output_address);
104
105	if (!hv_hypercall_pg)
106		return U64_MAX;
107
108	__asm__ __volatile__(CALL_NOSPEC
109			     : "=A" (hv_status),
110			       "+c" (input_address_lo), ASM_CALL_CONSTRAINT
111			     : "A" (control),
112			       "b" (input_address_hi),
113			       "D"(output_address_hi), "S"(output_address_lo),
114			       THUNK_TARGET(hv_hypercall_pg)
115			     : "cc", "memory");
116#endif /* !x86_64 */
117	return hv_status;
118}
119
120/* Fast hypercall with 8 bytes of input and no output */
121static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
122{
123	u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;
124
125#ifdef CONFIG_X86_64
126	{
127		__asm__ __volatile__(CALL_NOSPEC
128				     : "=a" (hv_status), ASM_CALL_CONSTRAINT,
129				       "+c" (control), "+d" (input1)
130				     : THUNK_TARGET(hv_hypercall_pg)
131				     : "cc", "r8", "r9", "r10", "r11");
132	}
133#else
134	{
135		u32 input1_hi = upper_32_bits(input1);
136		u32 input1_lo = lower_32_bits(input1);
137
138		__asm__ __volatile__ (CALL_NOSPEC
139				      : "=A"(hv_status),
140					"+c"(input1_lo),
141					ASM_CALL_CONSTRAINT
142				      :	"A" (control),
143					"b" (input1_hi),
144					THUNK_TARGET(hv_hypercall_pg)
145				      : "cc", "edi", "esi");
146	}
147#endif
148		return hv_status;
149}
150
151/* Fast hypercall with 16 bytes of input */
152static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
153{
154	u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;
155
156#ifdef CONFIG_X86_64
157	{
158		__asm__ __volatile__("mov %4, %%r8\n"
159				     CALL_NOSPEC
160				     : "=a" (hv_status), ASM_CALL_CONSTRAINT,
161				       "+c" (control), "+d" (input1)
162				     : "r" (input2),
163				       THUNK_TARGET(hv_hypercall_pg)
164				     : "cc", "r8", "r9", "r10", "r11");
165	}
166#else
167	{
168		u32 input1_hi = upper_32_bits(input1);
169		u32 input1_lo = lower_32_bits(input1);
170		u32 input2_hi = upper_32_bits(input2);
171		u32 input2_lo = lower_32_bits(input2);
172
173		__asm__ __volatile__ (CALL_NOSPEC
174				      : "=A"(hv_status),
175					"+c"(input1_lo), ASM_CALL_CONSTRAINT
176				      :	"A" (control), "b" (input1_hi),
177					"D"(input2_hi), "S"(input2_lo),
178					THUNK_TARGET(hv_hypercall_pg)
179				      : "cc");
180	}
181#endif
182	return hv_status;
183}
184
185/*
186 * Rep hypercalls. Callers of this functions are supposed to ensure that
187 * rep_count and varhead_size comply with Hyper-V hypercall definition.
188 */
189static inline u64 hv_do_rep_hypercall(u16 code, u16 rep_count, u16 varhead_size,
190				      void *input, void *output)
191{
192	u64 control = code;
193	u64 status;
194	u16 rep_comp;
195
196	control |= (u64)varhead_size << HV_HYPERCALL_VARHEAD_OFFSET;
197	control |= (u64)rep_count << HV_HYPERCALL_REP_COMP_OFFSET;
198
199	do {
200		status = hv_do_hypercall(control, input, output);
201		if ((status & HV_HYPERCALL_RESULT_MASK) != HV_STATUS_SUCCESS)
202			return status;
203
204		/* Bits 32-43 of status have 'Reps completed' data. */
205		rep_comp = (status & HV_HYPERCALL_REP_COMP_MASK) >>
206			HV_HYPERCALL_REP_COMP_OFFSET;
207
208		control &= ~HV_HYPERCALL_REP_START_MASK;
209		control |= (u64)rep_comp << HV_HYPERCALL_REP_START_OFFSET;
210
211		touch_nmi_watchdog();
212	} while (rep_comp < rep_count);
213
214	return status;
215}
216
217extern struct hv_vp_assist_page **hv_vp_assist_page;
218
219static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
220{
221	if (!hv_vp_assist_page)
222		return NULL;
223
224	return hv_vp_assist_page[cpu];
225}
226
227void __init hyperv_init(void);
228void hyperv_setup_mmu_ops(void);
229void *hv_alloc_hyperv_page(void);
230void *hv_alloc_hyperv_zeroed_page(void);
231void hv_free_hyperv_page(unsigned long addr);
232void set_hv_tscchange_cb(void (*cb)(void));
233void clear_hv_tscchange_cb(void);
234void hyperv_stop_tsc_emulation(void);
235int hyperv_flush_guest_mapping(u64 as);
236int hyperv_flush_guest_mapping_range(u64 as,
237		hyperv_fill_flush_list_func fill_func, void *data);
238int hyperv_fill_flush_guest_mapping_list(
239		struct hv_guest_mapping_flush_list *flush,
240		u64 start_gfn, u64 end_gfn);
241
242#ifdef CONFIG_X86_64
243void hv_apic_init(void);
244void __init hv_init_spinlocks(void);
245bool hv_vcpu_is_preempted(int vcpu);
246#else
247static inline void hv_apic_init(void) {}
248#endif
249
250#else /* CONFIG_HYPERV */
251static inline void hyperv_init(void) {}
252static inline void hyperv_setup_mmu_ops(void) {}
253static inline void *hv_alloc_hyperv_page(void) { return NULL; }
254static inline void hv_free_hyperv_page(unsigned long addr) {}
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}
268#endif /* CONFIG_HYPERV */
269
270
271#include <asm-generic/mshyperv.h>
272
273#endif
274