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__ */