linux-kernel - [PATCH 0/2] KVM: x86: fix edge EOI and IOAPIC reconfig race

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Date:	Thu, 13 Aug 2015 15:46:08 +0200
From:	Radim Krčmář <rkrcmar@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
	Steve Rutherford <srutherford@...gle.com>,
	stable@...r.kernel.org
Subject: [PATCH 0/2] KVM: x86: fix edge EOI and IOAPIC reconfig race

[1/2] changes sync_pir_to_irr interface to avoid a definitely
superfluous KVM_REQ_EVENT in [2/2].  It's possible that we don't need
KVM_REQ_EVENT, but a slight slowdown in execution is worth the time
needed for a proof.  (A quick test showed that KVM_REQ_EVENT is always
already set if sync_pir_to_irr does something.)

[2/2] is applicable to userspace split IOAPIC as well, but I hope that
we want it to work like normal IOAPIC (no ACK for edge irq), so I
haven't fixed it.

Radim Krčmář (2):
  KVM: x86: return bool from x86_ops.sync_pir_to_irr
  KVM: x86: fix edge EOI and IOAPIC reconfig race

 arch/x86/include/asm/kvm_host.h |  2 +-
 arch/x86/kvm/ioapic.c           |  7 ++++++-
 arch/x86/kvm/svm.c              |  4 ++--
 arch/x86/kvm/vmx.c              | 12 +++++++-----
 4 files changed, 16 insertions(+), 9 deletions(-)

-- 
2.5.0

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