mshyperv.h

  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(input) : 0;
 74	u64 output_address = output ? virt_to_phys(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(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