LXR linux/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#ifdef CONFIG_KVM_XEN
  13#include <linux/jump_label_ratelimit.h>
  14
  15extern struct static_key_false_deferred kvm_xen_enabled;
  16
  17int __kvm_xen_has_interrupt(struct kvm_vcpu *vcpu);
  18int kvm_xen_vcpu_set_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data);
  19int kvm_xen_vcpu_get_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data);
  20int kvm_xen_hvm_set_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data);
  21int kvm_xen_hvm_get_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data);
  22int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data);
  23int kvm_xen_hvm_config(struct kvm *kvm, struct kvm_xen_hvm_config *xhc);
  24void kvm_xen_init_vm(struct kvm *kvm);
  25void kvm_xen_destroy_vm(struct kvm *kvm);
  26
  27static inline bool kvm_xen_msr_enabled(struct kvm *kvm)
  28{
  29        return static_branch_unlikely(&kvm_xen_enabled.key) &&
  30                kvm->arch.xen_hvm_config.msr;
  31}
  32
  33static inline bool kvm_xen_hypercall_enabled(struct kvm *kvm)
  34{
  35        return static_branch_unlikely(&kvm_xen_enabled.key) &&
  36                (kvm->arch.xen_hvm_config.flags &
  37                 KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL);
  38}
  39
  40static inline int kvm_xen_has_interrupt(struct kvm_vcpu *vcpu)
  41{
  42        if (static_branch_unlikely(&kvm_xen_enabled.key) &&
  43            vcpu->arch.xen.vcpu_info_set && vcpu->kvm->arch.xen.upcall_vector)
  44                return __kvm_xen_has_interrupt(vcpu);
  45
  46        return 0;
  47}
  48#else
  49static inline int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data)
  50{
  51        return 1;
  52}
  53
  54static inline void kvm_xen_init_vm(struct kvm *kvm)
  55{
  56}
  57
  58static inline void kvm_xen_destroy_vm(struct kvm *kvm)
  59{
  60}
  61
  62static inline bool kvm_xen_msr_enabled(struct kvm *kvm)
  63{
  64        return false;
  65}
  66
  67static inline bool kvm_xen_hypercall_enabled(struct kvm *kvm)
  68{
  69        return false;
  70}
  71
  72static inline int kvm_xen_has_interrupt(struct kvm_vcpu *vcpu)
  73{
  74        return 0;
  75}
  76#endif
  77
  78int kvm_xen_hypercall(struct kvm_vcpu *vcpu);
  79
  80#include <asm/pvclock-abi.h>
  81#include <asm/xen/interface.h>
  82#include <xen/interface/vcpu.h>
  83
  84void kvm_xen_update_runstate_guest(struct kvm_vcpu *vcpu, int state);
  85
  86static inline void kvm_xen_runstate_set_running(struct kvm_vcpu *vcpu)
  87{
  88        kvm_xen_update_runstate_guest(vcpu, RUNSTATE_running);
  89}
  90
  91static inline void kvm_xen_runstate_set_preempted(struct kvm_vcpu *vcpu)
  92{
  93        /*
  94         * If the vCPU wasn't preempted but took a normal exit for
  95         * some reason (hypercalls, I/O, etc.), that is accounted as
  96         * still RUNSTATE_running, as the VMM is still operating on
  97         * behalf of the vCPU. Only if the VMM does actually block
  98         * does it need to enter RUNSTATE_blocked.
  99         */
 100        if (vcpu->preempted)
 101                kvm_xen_update_runstate_guest(vcpu, RUNSTATE_runnable);
 102}
 103
 104/* 32-bit compatibility definitions, also used natively in 32-bit build */
 105struct compat_arch_vcpu_info {
 106        unsigned int cr2;
 107        unsigned int pad[5];
 108};
 109
 110struct compat_vcpu_info {
 111        uint8_t evtchn_upcall_pending;
 112        uint8_t evtchn_upcall_mask;
 113        uint16_t pad;
 114        uint32_t evtchn_pending_sel;
 115        struct compat_arch_vcpu_info arch;
 116        struct pvclock_vcpu_time_info time;
 117}; /* 64 bytes (x86) */
 118
 119struct compat_arch_shared_info {
 120        unsigned int max_pfn;
 121        unsigned int pfn_to_mfn_frame_list_list;
 122        unsigned int nmi_reason;
 123        unsigned int p2m_cr3;
 124        unsigned int p2m_vaddr;
 125        unsigned int p2m_generation;
 126        uint32_t wc_sec_hi;
 127};
 128
 129struct compat_shared_info {
 130        struct compat_vcpu_info vcpu_info[MAX_VIRT_CPUS];
 131        uint32_t evtchn_pending[32];
 132        uint32_t evtchn_mask[32];
 133        struct pvclock_wall_clock wc;
 134        struct compat_arch_shared_info arch;
 135};
 136
 137struct compat_vcpu_runstate_info {
 138    int state;
 139    uint64_t state_entry_time;
 140    uint64_t time[4];
 141} __attribute__((packed));
 142
 143#endif /* __ARCH_X86_KVM_XEN_H__ */
 144