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| author | Maxim Levitsky <mlevitsk@redhat.com> | 2020-12-03 16:33:19 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-12-09 16:18:30 -0500 |
| commit | f57ad63a835c6f1fe646ea985e78a79eb206a5b3 (patch) | |
| tree | d41c77b75c80d726ed9771a110414e35637f808b /arch/x86/kvm/lapic.c | |
| parent | dee734a7de9169018b8108208587d3ff1fdfff18 (diff) | |
| download | linux-f57ad63a835c6f1fe646ea985e78a79eb206a5b3.tar.bz2 | |
KVM: x86: ignore SIPIs that are received while not in wait-for-sipi state
In the commit 1c96dcceaeb3
("KVM: x86: fix apic_accept_events vs check_nested_events"),
we accidently started latching SIPIs that are received while the cpu is not
waiting for them.
This causes vCPUs to never enter a halted state.
Fixes: 1c96dcceaeb3 ("KVM: x86: fix apic_accept_events vs check_nested_events")
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20201203143319.159394-2-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/lapic.c')
| -rw-r--r-- | arch/x86/kvm/lapic.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index e3ee597ff540..6a87623aa578 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -2892,14 +2892,15 @@ void kvm_apic_accept_events(struct kvm_vcpu *vcpu) else vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED; } - if (test_bit(KVM_APIC_SIPI, &pe) && - vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) { + if (test_bit(KVM_APIC_SIPI, &pe)) { clear_bit(KVM_APIC_SIPI, &apic->pending_events); - /* evaluate pending_events before reading the vector */ - smp_rmb(); - sipi_vector = apic->sipi_vector; - kvm_vcpu_deliver_sipi_vector(vcpu, sipi_vector); - vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; + if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) { + /* evaluate pending_events before reading the vector */ + smp_rmb(); + sipi_vector = apic->sipi_vector; + kvm_vcpu_deliver_sipi_vector(vcpu, sipi_vector); + vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; + } } } |