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List:       kvm
Subject:    Re: [PATCH 2/2] KVM: VMX: fix memory order between loading vmcs and clearing vmcs
From:       Marcelo Tosatti <mtosatti () redhat ! com>
Date:       2012-11-29 23:15:39
Message-ID: 20121129231539.GA7409 () amt ! cnet
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On Wed, Nov 28, 2012 at 08:54:14PM +0800, Xiao Guangrong wrote:
> 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>
> ---
>  arch/x86/kvm/vmx.c |   17 +++++++++++++++++
>  1 files changed, 17 insertions(+), 0 deletions(-)

Applied, thanks.

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