linux-kernel - [PATCH 0/2] KVM: x86: avoid simultaneous queueing of both IRQ and SMI

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Message-Id: <1464784501-13710-1-git-send-email-pbonzini@redhat.com>
Date:	Wed,  1 Jun 2016 14:34:59 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: [PATCH 0/2] KVM: x86: avoid simultaneous queueing of both IRQ and SMI

This was reported as a vmentry failure while running Windows with SMM
enabled.  It's not that rare if your processor lacks APICv---it happens
about 20-30% of the time while installing Windows 10.

I now understand the interrupt injection code (especially
complete_interrupts) better, and I also understand why the shortcut I took
in SMI handling was a bad idea.  In the end the code is somewhat simpler
with the patch applied than before.

The bug report is at https://github.com/tianocore/edk2/issues/91, but it
also fixes other Windows failures that Laszlo had reported to me privately.

Paolo

Paolo Bonzini (2):
  KVM: x86: avoid simultaneous queueing of both IRQ and SMI
  KVM: x86: rename process_smi to enter_smm, process_smi_request to
    process_smi

 arch/x86/kvm/x86.c | 75 ++++++++++++++++++++++++++++++++----------------------
 1 file changed, 44 insertions(+), 31 deletions(-)

-- 
1.8.3.1