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KVM: nSVM: restore clobbered INT_CTL fields after clearing VINTR

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Restore the INT_CTL value from the guest's VMCB once we've stopped using
it, so that virtual interrupts can be injected as requested by L1.
V_TPR is up-to-date however, and it can change if the guest writes to CR8,
so keep it.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2020-05-22 07:38:20 -04:00
parent e670bf68f4
commit d8e4e58f4b
1 changed files with 9 additions and 1 deletions
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10
arch/x86/kvm/svm/svm.c
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@ -1365,9 +1365,17 @@ static void svm_set_vintr(struct vcpu_svm *svm)
static void svm_clear_vintr(struct vcpu_svm *svm)
{
const u32 mask = V_TPR_MASK | V_GIF_ENABLE_MASK | V_GIF_MASK | V_INTR_MASKING_MASK;
clr_intercept(svm, INTERCEPT_VINTR);
svm->vmcb->control.int_ctl &= ~V_IRQ_MASK;
/* Drop int_ctl fields related to VINTR injection. */
svm->vmcb->control.int_ctl &= mask;
if (is_guest_mode(&svm->vcpu)) {
WARN_ON((svm->vmcb->control.int_ctl & V_TPR_MASK) !=
(svm->nested.ctl.int_ctl & V_TPR_MASK));
svm->vmcb->control.int_ctl |= svm->nested.ctl.int_ctl & ~mask;
}
mark_dirty(svm->vmcb, VMCB_INTR);
}