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