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KVM: VMX: Don't unblock vCPU w/ Posted IRQ if IRQs are disabled in guest 

[ Upstream commit 1831fa44df743a7cdffdf1c12c799bf6f3c12b8c ]

Don't configure the wakeup handler when a vCPU is blocking with IRQs
disabled, in which case any IRQ, posted or otherwise, should not be
recognized and thus should not wake the vCPU.

Fixes: bf9f6ac8d7 ("KVM: Update Posted-Interrupts Descriptor when vCPU is blocked")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20211009021236.4122790-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Paolo Bonzini 2021-11-16 09:32:47 -05:00 committed by Greg Kroah-Hartman
parent f303196899
commit b63190d020
1 changed files with 2 additions and 1 deletions
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3
arch/x86/kvm/vmx/posted_intr.c
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@ -147,7 +147,8 @@ int pi_pre_block(struct kvm_vcpu *vcpu)
struct pi_desc old, new;
struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu);
if (!vmx_can_use_vtd_pi(vcpu->kvm))
if (!vmx_can_use_vtd_pi(vcpu->kvm) ||
vmx_interrupt_blocked(vcpu))
return 0;
WARN_ON(irqs_disabled());