| 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Copyright © 2019 Oracle and/or its affiliates. All rights reserved. |
| 4 | * Copyright © 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved. |
| 5 | * |
| 6 | * KVM Xen emulation |
| 7 | */ |
| 8 | |
| 9 | #ifndef __ARCH_X86_KVM_XEN_H__ |
| 10 | #define __ARCH_X86_KVM_XEN_H__ |
| 11 | |
| 12 | #include <asm/xen/cpuid.h> |
| 13 | #include <asm/xen/hypervisor.h> |
| 14 | |
| 15 | #ifdef CONFIG_KVM_XEN |
| 16 | #include <linux/jump_label_ratelimit.h> |
| 17 | |
| 18 | extern struct static_key_false_deferred kvm_xen_enabled; |
| 19 | |
| 20 | int __kvm_xen_has_interrupt(struct kvm_vcpu *vcpu); |
| 21 | void kvm_xen_inject_pending_events(struct kvm_vcpu *vcpu); |
| 22 | void kvm_xen_inject_vcpu_vector(struct kvm_vcpu *vcpu); |
| 23 | int kvm_xen_vcpu_set_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data); |
| 24 | int kvm_xen_vcpu_get_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data); |
| 25 | int kvm_xen_hvm_set_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data); |
| 26 | int kvm_xen_hvm_get_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data); |
| 27 | int kvm_xen_hvm_evtchn_send(struct kvm *kvm, struct kvm_irq_routing_xen_evtchn *evt); |
| 28 | int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data); |
| 29 | int kvm_xen_hvm_config(struct kvm *kvm, struct kvm_xen_hvm_config *xhc); |
| 30 | void kvm_xen_init_vm(struct kvm *kvm); |
| 31 | void kvm_xen_destroy_vm(struct kvm *kvm); |
| 32 | void kvm_xen_init_vcpu(struct kvm_vcpu *vcpu); |
| 33 | void kvm_xen_destroy_vcpu(struct kvm_vcpu *vcpu); |
| 34 | int kvm_xen_set_evtchn_fast(struct kvm_xen_evtchn *xe, |
| 35 | struct kvm *kvm); |
| 36 | int kvm_xen_setup_evtchn(struct kvm *kvm, |
| 37 | struct kvm_kernel_irq_routing_entry *e, |
| 38 | const struct kvm_irq_routing_entry *ue); |
| 39 | |
| 40 | static inline void kvm_xen_sw_enable_lapic(struct kvm_vcpu *vcpu) |
| 41 | { |
| 42 | /* |
| 43 | * The local APIC is being enabled. If the per-vCPU upcall vector is |
| 44 | * set and the vCPU's evtchn_upcall_pending flag is set, inject the |
| 45 | * interrupt. |
| 46 | */ |
| 47 | if (static_branch_unlikely(&kvm_xen_enabled.key) && |
| 48 | vcpu->arch.xen.vcpu_info_cache.active && |
| 49 | vcpu->arch.xen.upcall_vector && __kvm_xen_has_interrupt(vcpu)) |
| 50 | kvm_xen_inject_vcpu_vector(vcpu); |
| 51 | } |
| 52 | |
| 53 | static inline bool kvm_xen_is_tsc_leaf(struct kvm_vcpu *vcpu, u32 function) |
| 54 | { |
| 55 | return static_branch_unlikely(&kvm_xen_enabled.key) && |
| 56 | vcpu->arch.xen.cpuid.base && |
| 57 | function <= vcpu->arch.xen.cpuid.limit && |
| 58 | function == (vcpu->arch.xen.cpuid.base | XEN_CPUID_LEAF(3)); |
| 59 | } |
| 60 | |
| 61 | static inline bool kvm_xen_msr_enabled(struct kvm *kvm) |
| 62 | { |
| 63 | return static_branch_unlikely(&kvm_xen_enabled.key) && |
| 64 | kvm->arch.xen.hvm_config.msr; |
| 65 | } |
| 66 | |
| 67 | static inline bool kvm_xen_is_hypercall_page_msr(struct kvm *kvm, u32 msr) |
| 68 | { |
| 69 | if (!static_branch_unlikely(&kvm_xen_enabled.key)) |
| 70 | return false; |
| 71 | |
| 72 | return msr && msr == kvm->arch.xen.hvm_config.msr; |
| 73 | } |
| 74 | |
| 75 | static inline bool kvm_xen_hypercall_enabled(struct kvm *kvm) |
| 76 | { |
| 77 | return static_branch_unlikely(&kvm_xen_enabled.key) && |
| 78 | (kvm->arch.xen.hvm_config.flags & |
| 79 | KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL); |
| 80 | } |
| 81 | |
| 82 | static inline int kvm_xen_has_interrupt(struct kvm_vcpu *vcpu) |
| 83 | { |
| 84 | if (static_branch_unlikely(&kvm_xen_enabled.key) && |
| 85 | vcpu->arch.xen.vcpu_info_cache.active && |
| 86 | vcpu->kvm->arch.xen.upcall_vector) |
| 87 | return __kvm_xen_has_interrupt(vcpu); |
| 88 | |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | static inline bool kvm_xen_has_pending_events(struct kvm_vcpu *vcpu) |
| 93 | { |
| 94 | return static_branch_unlikely(&kvm_xen_enabled.key) && |
| 95 | vcpu->arch.xen.evtchn_pending_sel; |
| 96 | } |
| 97 | |
| 98 | static inline bool kvm_xen_timer_enabled(struct kvm_vcpu *vcpu) |
| 99 | { |
| 100 | return !!vcpu->arch.xen.timer_virq; |
| 101 | } |
| 102 | |
| 103 | static inline int kvm_xen_has_pending_timer(struct kvm_vcpu *vcpu) |
| 104 | { |
| 105 | if (kvm_xen_hypercall_enabled(kvm: vcpu->kvm) && kvm_xen_timer_enabled(vcpu)) |
| 106 | return atomic_read(v: &vcpu->arch.xen.timer_pending); |
| 107 | |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | void kvm_xen_inject_timer_irqs(struct kvm_vcpu *vcpu); |
| 112 | #else |
| 113 | static inline int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data) |
| 114 | { |
| 115 | return 1; |
| 116 | } |
| 117 | |
| 118 | static inline void kvm_xen_init_vm(struct kvm *kvm) |
| 119 | { |
| 120 | } |
| 121 | |
| 122 | static inline void kvm_xen_destroy_vm(struct kvm *kvm) |
| 123 | { |
| 124 | } |
| 125 | |
| 126 | static inline void kvm_xen_init_vcpu(struct kvm_vcpu *vcpu) |
| 127 | { |
| 128 | } |
| 129 | |
| 130 | static inline void kvm_xen_destroy_vcpu(struct kvm_vcpu *vcpu) |
| 131 | { |
| 132 | } |
| 133 | |
| 134 | static inline void kvm_xen_sw_enable_lapic(struct kvm_vcpu *vcpu) |
| 135 | { |
| 136 | } |
| 137 | |
| 138 | static inline bool kvm_xen_msr_enabled(struct kvm *kvm) |
| 139 | { |
| 140 | return false; |
| 141 | } |
| 142 | |
| 143 | static inline bool kvm_xen_is_hypercall_page_msr(struct kvm *kvm, u32 msr) |
| 144 | { |
| 145 | return false; |
| 146 | } |
| 147 | |
| 148 | static inline bool kvm_xen_hypercall_enabled(struct kvm *kvm) |
| 149 | { |
| 150 | return false; |
| 151 | } |
| 152 | |
| 153 | static inline int kvm_xen_has_interrupt(struct kvm_vcpu *vcpu) |
| 154 | { |
| 155 | return 0; |
| 156 | } |
| 157 | |
| 158 | static inline void kvm_xen_inject_pending_events(struct kvm_vcpu *vcpu) |
| 159 | { |
| 160 | } |
| 161 | |
| 162 | static inline bool kvm_xen_has_pending_events(struct kvm_vcpu *vcpu) |
| 163 | { |
| 164 | return false; |
| 165 | } |
| 166 | |
| 167 | static inline int kvm_xen_has_pending_timer(struct kvm_vcpu *vcpu) |
| 168 | { |
| 169 | return 0; |
| 170 | } |
| 171 | |
| 172 | static inline void kvm_xen_inject_timer_irqs(struct kvm_vcpu *vcpu) |
| 173 | { |
| 174 | } |
| 175 | |
| 176 | static inline bool kvm_xen_timer_enabled(struct kvm_vcpu *vcpu) |
| 177 | { |
| 178 | return false; |
| 179 | } |
| 180 | |
| 181 | static inline bool kvm_xen_is_tsc_leaf(struct kvm_vcpu *vcpu, u32 function) |
| 182 | { |
| 183 | return false; |
| 184 | } |
| 185 | #endif |
| 186 | |
| 187 | int kvm_xen_hypercall(struct kvm_vcpu *vcpu); |
| 188 | |
| 189 | #include <asm/pvclock-abi.h> |
| 190 | #include <asm/xen/interface.h> |
| 191 | #include <xen/interface/vcpu.h> |
| 192 | |
| 193 | void kvm_xen_update_runstate(struct kvm_vcpu *vcpu, int state); |
| 194 | |
| 195 | static inline void kvm_xen_runstate_set_running(struct kvm_vcpu *vcpu) |
| 196 | { |
| 197 | kvm_xen_update_runstate(vcpu, RUNSTATE_running); |
| 198 | } |
| 199 | |
| 200 | static inline void kvm_xen_runstate_set_preempted(struct kvm_vcpu *vcpu) |
| 201 | { |
| 202 | /* |
| 203 | * If the vCPU wasn't preempted but took a normal exit for |
| 204 | * some reason (hypercalls, I/O, etc.), that is accounted as |
| 205 | * still RUNSTATE_running, as the VMM is still operating on |
| 206 | * behalf of the vCPU. Only if the VMM does actually block |
| 207 | * does it need to enter RUNSTATE_blocked. |
| 208 | */ |
| 209 | if (WARN_ON_ONCE(!vcpu->preempted)) |
| 210 | return; |
| 211 | |
| 212 | kvm_xen_update_runstate(vcpu, RUNSTATE_runnable); |
| 213 | } |
| 214 | |
| 215 | /* 32-bit compatibility definitions, also used natively in 32-bit build */ |
| 216 | struct compat_arch_vcpu_info { |
| 217 | unsigned int cr2; |
| 218 | unsigned int pad[5]; |
| 219 | }; |
| 220 | |
| 221 | struct compat_vcpu_info { |
| 222 | uint8_t evtchn_upcall_pending; |
| 223 | uint8_t evtchn_upcall_mask; |
| 224 | uint16_t pad; |
| 225 | uint32_t evtchn_pending_sel; |
| 226 | struct compat_arch_vcpu_info arch; |
| 227 | struct pvclock_vcpu_time_info time; |
| 228 | }; /* 64 bytes (x86) */ |
| 229 | |
| 230 | struct compat_arch_shared_info { |
| 231 | unsigned int max_pfn; |
| 232 | unsigned int pfn_to_mfn_frame_list_list; |
| 233 | unsigned int nmi_reason; |
| 234 | unsigned int p2m_cr3; |
| 235 | unsigned int p2m_vaddr; |
| 236 | unsigned int p2m_generation; |
| 237 | uint32_t wc_sec_hi; |
| 238 | }; |
| 239 | |
| 240 | struct compat_shared_info { |
| 241 | struct compat_vcpu_info vcpu_info[MAX_VIRT_CPUS]; |
| 242 | uint32_t evtchn_pending[32]; |
| 243 | uint32_t evtchn_mask[32]; |
| 244 | struct pvclock_wall_clock wc; |
| 245 | struct compat_arch_shared_info arch; |
| 246 | }; |
| 247 | |
| 248 | #define COMPAT_EVTCHN_2L_NR_CHANNELS (8 * \ |
| 249 | sizeof_field(struct compat_shared_info, \ |
| 250 | evtchn_pending)) |
| 251 | struct compat_vcpu_runstate_info { |
| 252 | int state; |
| 253 | uint64_t state_entry_time; |
| 254 | uint64_t time[4]; |
| 255 | } __attribute__((packed)); |
| 256 | |
| 257 | struct compat_sched_poll { |
| 258 | /* This is actually a guest virtual address which points to ports. */ |
| 259 | uint32_t ports; |
| 260 | unsigned int nr_ports; |
| 261 | uint64_t timeout; |
| 262 | }; |
| 263 | |
| 264 | #endif /* __ARCH_X86_KVM_XEN_H__ */ |
| 265 | |