KVM: Fix simultaneous NMIs

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If simultaneous NMIs happen, we're supposed to queue the second
and next (collapsing them), but currently we sometimes collapse
the second into the first.

Fix by using a counter for pending NMIs instead of a bool; since
the counter limit depends on whether the processor is currently
in an NMI handler, which can only be checked in vcpu context
(via the NMI mask), we add a new KVM_REQ_NMI to request recalculation
of the counter.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

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This commit is contained in:

Avi Kivity 2011-09-20 13:43:14 +03:00

parent 1cd196ea42

commit 7460fb4a34

3 changed files with 35 additions and 19 deletions

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5

arch/x86/include/asm/kvm_host.h

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48

arch/x86/kvm/x86.c

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1

include/linux/kvm_host.h

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