arch/x86/kvm/xen.h

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