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(parent: 8acb420) | patch
KVM: Fix race in apic->pending_events processing
authorGleb Natapov <gleb@redhat.com>
Mon, 3 Jun 2013 08:30:02 +0000 (11:30 +0300)
committerGleb Natapov <gleb@redhat.com>
Mon, 3 Jun 2013 08:32:39 +0000 (11:32 +0300)
commit299018f44ac553dce3caf84df1d14c4764faa279
tree75c178b1c2767697e2bef132aea84a8c04c1b156tree | snapshot
parent8acb42070ec4c87a9baab5c7bac626030d5bef28commit | diff
KVM: Fix race in apic->pending_events processing

apic->pending_events processing has a race that may cause INIT and
SIPI
processing to be reordered:

vpu0:                            vcpu1:
set INIT
                               test_and_clear_bit(KVM_APIC_INIT)
                                  process INIT
set INIT
set SIPI
                               test_and_clear_bit(KVM_APIC_SIPI)
                                  process SIPI

At the end INIT is left pending in pending_events. The following patch
fixes this by latching pending event before processing them.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
arch/x86/kvm/lapic.c diff | blob | history
Domain: System / Kernel;