xen.h

Go to the documentation of this file.

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright © 2019 Oracle and/or its affiliates. All rights reserved.
 * Copyright © 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * KVM Xen emulation
 */
 
#ifndef __ARCH_X86_KVM_XEN_H__
#define __ARCH_X86_KVM_XEN_H__
 
#include <asm/xen/hypervisor.h>
 
#ifdef CONFIG_KVM_XEN
#include <linux/jump_label_ratelimit.h>
 
extern struct static_key_false_deferred kvm_xen_enabled;
 
int __kvm_xen_has_interrupt(struct kvm_vcpu *vcpu);
void kvm_xen_inject_pending_events(struct kvm_vcpu *vcpu);
void kvm_xen_inject_vcpu_vector(struct kvm_vcpu *vcpu);
int kvm_xen_vcpu_set_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data);
int kvm_xen_vcpu_get_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data);
int kvm_xen_hvm_set_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data);
int kvm_xen_hvm_get_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data);
int kvm_xen_hvm_evtchn_send(struct kvm *kvm, struct kvm_irq_routing_xen_evtchn *evt);
int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data);
int kvm_xen_hvm_config(struct kvm *kvm, struct kvm_xen_hvm_config *xhc);
void kvm_xen_init_vm(struct kvm *kvm);
void kvm_xen_destroy_vm(struct kvm *kvm);
void kvm_xen_init_vcpu(struct kvm_vcpu *vcpu);
void kvm_xen_destroy_vcpu(struct kvm_vcpu *vcpu);
int kvm_xen_set_evtchn_fast(struct kvm_xen_evtchn *xe,
                struct kvm *kvm);
int kvm_xen_setup_evtchn(struct kvm *kvm,
             struct kvm_kernel_irq_routing_entry *e,
             const struct kvm_irq_routing_entry *ue);
void kvm_xen_update_tsc_info(struct kvm_vcpu *vcpu);
 
static inline void kvm_xen_sw_enable_lapic(struct kvm_vcpu *vcpu)
{
    /*
     * The local APIC is being enabled. If the per-vCPU upcall vector is
     * set and the vCPU's evtchn_upcall_pending flag is set, inject the
     * interrupt.
     */
    if (static_branch_unlikely(&kvm_xen_enabled.key) &&
        vcpu->arch.xen.vcpu_info_cache.active &&
        vcpu->arch.xen.upcall_vector && __kvm_xen_has_interrupt(vcpu))
        kvm_xen_inject_vcpu_vector(vcpu);
}
 
static inline bool kvm_xen_msr_enabled(struct kvm *kvm)
{
    return static_branch_unlikely(&kvm_xen_enabled.key) &&
        kvm->arch.xen_hvm_config.msr;
}
 
static inline bool kvm_xen_hypercall_enabled(struct kvm *kvm)
{
    return static_branch_unlikely(&kvm_xen_enabled.key) &&
        (kvm->arch.xen_hvm_config.flags &
         KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL);
}
 
static inline int kvm_xen_has_interrupt(struct kvm_vcpu *vcpu)
{
    if (static_branch_unlikely(&kvm_xen_enabled.key) &&
        vcpu->arch.xen.vcpu_info_cache.active &&
        vcpu->kvm->arch.xen.upcall_vector)
        return __kvm_xen_has_interrupt(vcpu);
 
    return 0;
}
 
static inline bool kvm_xen_has_pending_events(struct kvm_vcpu *vcpu)
{
    return static_branch_unlikely(&kvm_xen_enabled.key) &&
        vcpu->arch.xen.evtchn_pending_sel;
}
 
static inline bool kvm_xen_timer_enabled(struct kvm_vcpu *vcpu)
{
    return !!vcpu->arch.xen.timer_virq;
}
 
static inline int kvm_xen_has_pending_timer(struct kvm_vcpu *vcpu)
{
    if (kvm_xen_hypercall_enabled(vcpu->kvm) && kvm_xen_timer_enabled(vcpu))
        return atomic_read(&vcpu->arch.xen.timer_pending);
 
    return 0;
}
 
void kvm_xen_inject_timer_irqs(struct kvm_vcpu *vcpu);
#else
static inline int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data)
{
    return 1;
}
 
static inline void kvm_xen_init_vm(struct kvm *kvm)
{
}
 
static inline void kvm_xen_destroy_vm(struct kvm *kvm)
{
}
 
static inline void kvm_xen_init_vcpu(struct kvm_vcpu *vcpu)
{
}
 
static inline void kvm_xen_destroy_vcpu(struct kvm_vcpu *vcpu)
{
}
 
static inline void kvm_xen_sw_enable_lapic(struct kvm_vcpu *vcpu)
{
}
 
static inline bool kvm_xen_msr_enabled(struct kvm *kvm)
{
    return false;
}
 
static inline bool kvm_xen_hypercall_enabled(struct kvm *kvm)
{
    return false;
}
 
static inline int kvm_xen_has_interrupt(struct kvm_vcpu *vcpu)
{
    return 0;
}
 
static inline void kvm_xen_inject_pending_events(struct kvm_vcpu *vcpu)
{
}
 
static inline bool kvm_xen_has_pending_events(struct kvm_vcpu *vcpu)
{
    return false;
}
 
static inline int kvm_xen_has_pending_timer(struct kvm_vcpu *vcpu)
{
    return 0;
}
 
static inline void kvm_xen_inject_timer_irqs(struct kvm_vcpu *vcpu)
{
}
 
static inline bool kvm_xen_timer_enabled(struct kvm_vcpu *vcpu)
{
    return false;
}
 
static inline void kvm_xen_update_tsc_info(struct kvm_vcpu *vcpu)
{
}
#endif
 
int kvm_xen_hypercall(struct kvm_vcpu *vcpu);
 
#include <asm/pvclock-abi.h>
#include <asm/xen/interface.h>
#include <xen/interface/vcpu.h>
 
void kvm_xen_update_runstate(struct kvm_vcpu *vcpu, int state);
 
static inline void kvm_xen_runstate_set_running(struct kvm_vcpu *vcpu)
{
    kvm_xen_update_runstate(vcpu, RUNSTATE_running);
}
 
static inline void kvm_xen_runstate_set_preempted(struct kvm_vcpu *vcpu)
{
    /*
     * If the vCPU wasn't preempted but took a normal exit for
     * some reason (hypercalls, I/O, etc.), that is accounted as
     * still RUNSTATE_running, as the VMM is still operating on
     * behalf of the vCPU. Only if the VMM does actually block
     * does it need to enter RUNSTATE_blocked.
     */
    if (WARN_ON_ONCE(!vcpu->preempted))
        return;
 
    kvm_xen_update_runstate(vcpu, RUNSTATE_runnable);
}
 
/* 32-bit compatibility definitions, also used natively in 32-bit build */
struct compat_arch_vcpu_info {
    unsigned int cr2;
    unsigned int pad[5];
};
 
struct compat_vcpu_info {
    uint8_t evtchn_upcall_pending;
    uint8_t evtchn_upcall_mask;
    uint16_t pad;
    uint32_t evtchn_pending_sel;
    struct compat_arch_vcpu_info arch;
    struct pvclock_vcpu_time_info time;
}; /* 64 bytes (x86) */
 
struct compat_arch_shared_info {
    unsigned int max_pfn;
    unsigned int pfn_to_mfn_frame_list_list;
    unsigned int nmi_reason;
    unsigned int p2m_cr3;
    unsigned int p2m_vaddr;
    unsigned int p2m_generation;
    uint32_t wc_sec_hi;
};
 
struct compat_shared_info {
    struct compat_vcpu_info vcpu_info[MAX_VIRT_CPUS];
    uint32_t evtchn_pending[32];
    uint32_t evtchn_mask[32];
    struct pvclock_wall_clock wc;
    struct compat_arch_shared_info arch;
};
 
#define COMPAT_EVTCHN_2L_NR_CHANNELS (8 *               \
                      sizeof_field(struct compat_shared_info, \
                           evtchn_pending))
struct compat_vcpu_runstate_info {
    int state;
    uint64_t state_entry_time;
    uint64_t time[4];
} __attribute__((packed));
 
struct compat_sched_poll {
    /* This is actually a guest virtual address which points to ports. */
    uint32_t ports;
    unsigned int nr_ports;
    uint64_t timeout;
};
 
#endif /* __ARCH_X86_KVM_XEN_H__ */