Commit 35da8a11 authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Kleber Sacilotto de Souza

KVM: nSVM: clear events pending from svm_complete_interrupts() when exiting to L1

BugLink: https://bugs.launchpad.net/bugs/1822271

[ Upstream commit 619ad846 ]

kvm-unit-tests' eventinj "NMI failing on IDT" test results in NMI being
delivered to the host (L1) when it's running nested. The problem seems to
be: svm_complete_interrupts() raises 'nmi_injected' flag but later we
decide to reflect EXIT_NPF to L1. The flag remains pending and we do NMI
injection upon entry so it got delivered to L1 instead of L2.

It seems that VMX code solves the same issue in prepare_vmcs12(), this was
introduced with code refactoring in commit 5f3d5799 ("KVM: nVMX: Rework
event injection and recovery").
Signed-off-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
Signed-off-by: default avatarStefan Bader <stefan.bader@canonical.com>
Acked-by: default avatarJuerg Haefliger <juerg.haefliger@canonical.com>
Signed-off-by: default avatarKleber Sacilotto de Souza <kleber.souza@canonical.com>
parent cbbd4a36
No related merge requests found
......@@ -2404,6 +2404,14 @@ static int nested_svm_vmexit(struct vcpu_svm *svm)
kvm_mmu_reset_context(&svm->vcpu);
kvm_mmu_load(&svm->vcpu);
/*
* Drop what we picked up for L2 via svm_complete_interrupts() so it
* doesn't end up in L1.
*/
svm->vcpu.arch.nmi_injected = false;
kvm_clear_exception_queue(&svm->vcpu);
kvm_clear_interrupt_queue(&svm->vcpu);
return 0;
}
......
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