KVM: VMX: fix memory order between loading vmcs and clearing vmcs

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vmcs->cpu indicates whether it exists on the target cpu, -1 means the vmcs
does not exist on any vcpu

If vcpu load vmcs with vmcs.cpu = -1, it can be directly added to cpu's percpu
list. The list can be corrupted if the cpu prefetch the vmcs's list before
reading vmcs->cpu. Meanwhile, we should remove vmcs from the list before
making vmcs->vcpu == -1 be visible

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

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Xiao Guangrong 2012-11-28 20:54:14 +08:00 • committed by Marcelo Tosatti

parent e6c7d32172

commit 5a560f8b5e

1 changed files with 17 additions and 0 deletions

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arch/x86/kvm/vmx.c

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