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| author | Joao Martins <joao.m.martins@oracle.com> | 2022-03-03 18:41:22 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-04-02 12:41:16 +0300 |
| commit | 536395260582be7443b0b35b0bbb89ffe3947f62 (patch) | |
| tree | a279baa81d433c68a638fbdceae34120b4133258 /arch/x86/kvm/xen.h | |
| parent | 942c2490c23f2800ad8143f5eb84a79b859aa743 (diff) | |
| download | linux-536395260582be7443b0b35b0bbb89ffe3947f62.tar.xz | |
KVM: x86/xen: handle PV timers oneshot mode
If the guest has offloaded the timer virq, handle the following
hypercalls for programming the timer:
VCPUOP_set_singleshot_timer
VCPUOP_stop_singleshot_timer
set_timer_op(timestamp_ns)
The event channel corresponding to the timer virq is then used to inject
events once timer deadlines are met. For now we back the PV timer with
hrtimer.
[ dwmw2: Add save/restore, 32-bit compat mode, immediate delivery,
don't check timer in kvm_vcpu_has_event() ]
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20220303154127.202856-13-dwmw2@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/xen.h')
| -rw-r--r-- | arch/x86/kvm/xen.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/x86/kvm/xen.h b/arch/x86/kvm/xen.h index 54d587aae85b..ee5c4ae0755c 100644 --- a/arch/x86/kvm/xen.h +++ b/arch/x86/kvm/xen.h @@ -62,6 +62,20 @@ static inline bool kvm_xen_has_pending_events(struct kvm_vcpu *vcpu) 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) { @@ -107,6 +121,20 @@ 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; +} #endif int kvm_xen_hypercall(struct kvm_vcpu *vcpu); |