mshyperv.h (7095B)
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 14union hv_ghcb; 15 16DECLARE_STATIC_KEY_FALSE(isolation_type_snp); 17 18typedef int (*hyperv_fill_flush_list_func)( 19 struct hv_guest_mapping_flush_list *flush, 20 void *data); 21 22#define hv_get_raw_timer() rdtsc_ordered() 23 24void hyperv_vector_handler(struct pt_regs *regs); 25 26#if IS_ENABLED(CONFIG_HYPERV) 27extern int hyperv_init_cpuhp; 28 29extern void *hv_hypercall_pg; 30 31extern u64 hv_current_partition_id; 32 33extern union hv_ghcb * __percpu *hv_ghcb_pg; 34 35int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages); 36int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id); 37int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags); 38 39static inline u64 hv_do_hypercall(u64 control, void *input, void *output) 40{ 41 u64 input_address = input ? virt_to_phys(input) : 0; 42 u64 output_address = output ? virt_to_phys(output) : 0; 43 u64 hv_status; 44 45#ifdef CONFIG_X86_64 46 if (!hv_hypercall_pg) 47 return U64_MAX; 48 49 __asm__ __volatile__("mov %4, %%r8\n" 50 CALL_NOSPEC 51 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 52 "+c" (control), "+d" (input_address) 53 : "r" (output_address), 54 THUNK_TARGET(hv_hypercall_pg) 55 : "cc", "memory", "r8", "r9", "r10", "r11"); 56#else 57 u32 input_address_hi = upper_32_bits(input_address); 58 u32 input_address_lo = lower_32_bits(input_address); 59 u32 output_address_hi = upper_32_bits(output_address); 60 u32 output_address_lo = lower_32_bits(output_address); 61 62 if (!hv_hypercall_pg) 63 return U64_MAX; 64 65 __asm__ __volatile__(CALL_NOSPEC 66 : "=A" (hv_status), 67 "+c" (input_address_lo), ASM_CALL_CONSTRAINT 68 : "A" (control), 69 "b" (input_address_hi), 70 "D"(output_address_hi), "S"(output_address_lo), 71 THUNK_TARGET(hv_hypercall_pg) 72 : "cc", "memory"); 73#endif /* !x86_64 */ 74 return hv_status; 75} 76 77/* Fast hypercall with 8 bytes of input and no output */ 78static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1) 79{ 80 u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT; 81 82#ifdef CONFIG_X86_64 83 { 84 __asm__ __volatile__(CALL_NOSPEC 85 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 86 "+c" (control), "+d" (input1) 87 : THUNK_TARGET(hv_hypercall_pg) 88 : "cc", "r8", "r9", "r10", "r11"); 89 } 90#else 91 { 92 u32 input1_hi = upper_32_bits(input1); 93 u32 input1_lo = lower_32_bits(input1); 94 95 __asm__ __volatile__ (CALL_NOSPEC 96 : "=A"(hv_status), 97 "+c"(input1_lo), 98 ASM_CALL_CONSTRAINT 99 : "A" (control), 100 "b" (input1_hi), 101 THUNK_TARGET(hv_hypercall_pg) 102 : "cc", "edi", "esi"); 103 } 104#endif 105 return hv_status; 106} 107 108/* Fast hypercall with 16 bytes of input */ 109static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2) 110{ 111 u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT; 112 113#ifdef CONFIG_X86_64 114 { 115 __asm__ __volatile__("mov %4, %%r8\n" 116 CALL_NOSPEC 117 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 118 "+c" (control), "+d" (input1) 119 : "r" (input2), 120 THUNK_TARGET(hv_hypercall_pg) 121 : "cc", "r8", "r9", "r10", "r11"); 122 } 123#else 124 { 125 u32 input1_hi = upper_32_bits(input1); 126 u32 input1_lo = lower_32_bits(input1); 127 u32 input2_hi = upper_32_bits(input2); 128 u32 input2_lo = lower_32_bits(input2); 129 130 __asm__ __volatile__ (CALL_NOSPEC 131 : "=A"(hv_status), 132 "+c"(input1_lo), ASM_CALL_CONSTRAINT 133 : "A" (control), "b" (input1_hi), 134 "D"(input2_hi), "S"(input2_lo), 135 THUNK_TARGET(hv_hypercall_pg) 136 : "cc"); 137 } 138#endif 139 return hv_status; 140} 141 142extern struct hv_vp_assist_page **hv_vp_assist_page; 143 144static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu) 145{ 146 if (!hv_vp_assist_page) 147 return NULL; 148 149 return hv_vp_assist_page[cpu]; 150} 151 152void __init hyperv_init(void); 153void hyperv_setup_mmu_ops(void); 154void set_hv_tscchange_cb(void (*cb)(void)); 155void clear_hv_tscchange_cb(void); 156void hyperv_stop_tsc_emulation(void); 157int hyperv_flush_guest_mapping(u64 as); 158int hyperv_flush_guest_mapping_range(u64 as, 159 hyperv_fill_flush_list_func fill_func, void *data); 160int hyperv_fill_flush_guest_mapping_list( 161 struct hv_guest_mapping_flush_list *flush, 162 u64 start_gfn, u64 end_gfn); 163 164#ifdef CONFIG_X86_64 165void hv_apic_init(void); 166void __init hv_init_spinlocks(void); 167bool hv_vcpu_is_preempted(int vcpu); 168#else 169static inline void hv_apic_init(void) {} 170#endif 171 172struct irq_domain *hv_create_pci_msi_domain(void); 173 174int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector, 175 struct hv_interrupt_entry *entry); 176int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry); 177int hv_set_mem_host_visibility(unsigned long addr, int numpages, bool visible); 178 179#ifdef CONFIG_AMD_MEM_ENCRYPT 180void hv_ghcb_msr_write(u64 msr, u64 value); 181void hv_ghcb_msr_read(u64 msr, u64 *value); 182bool hv_ghcb_negotiate_protocol(void); 183void hv_ghcb_terminate(unsigned int set, unsigned int reason); 184#else 185static inline void hv_ghcb_msr_write(u64 msr, u64 value) {} 186static inline void hv_ghcb_msr_read(u64 msr, u64 *value) {} 187static inline bool hv_ghcb_negotiate_protocol(void) { return false; } 188static inline void hv_ghcb_terminate(unsigned int set, unsigned int reason) {} 189#endif 190 191extern bool hv_isolation_type_snp(void); 192 193static inline bool hv_is_synic_reg(unsigned int reg) 194{ 195 if ((reg >= HV_REGISTER_SCONTROL) && 196 (reg <= HV_REGISTER_SINT15)) 197 return true; 198 return false; 199} 200 201static inline u64 hv_get_register(unsigned int reg) 202{ 203 u64 value; 204 205 if (hv_is_synic_reg(reg) && hv_isolation_type_snp()) 206 hv_ghcb_msr_read(reg, &value); 207 else 208 rdmsrl(reg, value); 209 return value; 210} 211 212static inline void hv_set_register(unsigned int reg, u64 value) 213{ 214 if (hv_is_synic_reg(reg) && hv_isolation_type_snp()) { 215 hv_ghcb_msr_write(reg, value); 216 217 /* Write proxy bit via wrmsl instruction */ 218 if (reg >= HV_REGISTER_SINT0 && 219 reg <= HV_REGISTER_SINT15) 220 wrmsrl(reg, value | 1 << 20); 221 } else { 222 wrmsrl(reg, value); 223 } 224} 225 226#else /* CONFIG_HYPERV */ 227static inline void hyperv_init(void) {} 228static inline void hyperv_setup_mmu_ops(void) {} 229static inline void set_hv_tscchange_cb(void (*cb)(void)) {} 230static inline void clear_hv_tscchange_cb(void) {} 231static inline void hyperv_stop_tsc_emulation(void) {}; 232static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu) 233{ 234 return NULL; 235} 236static inline int hyperv_flush_guest_mapping(u64 as) { return -1; } 237static inline int hyperv_flush_guest_mapping_range(u64 as, 238 hyperv_fill_flush_list_func fill_func, void *data) 239{ 240 return -1; 241} 242static inline void hv_set_register(unsigned int reg, u64 value) { } 243static inline u64 hv_get_register(unsigned int reg) { return 0; } 244static inline int hv_set_mem_host_visibility(unsigned long addr, int numpages, 245 bool visible) 246{ 247 return -1; 248} 249#endif /* CONFIG_HYPERV */ 250 251 252#include <asm-generic/mshyperv.h> 253 254#endif