linux-kernel - Re: [PATCH 2/2] KVM: VMX: fix memory order between loading vmcs and clearing vmcs

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Message-ID: <20121129231539.GA7409@amt.cnet>
Date:	Thu, 29 Nov 2012 21:15:39 -0200
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
Cc:	Avi Kivity <avi@...hat.com>, Gleb Natapov <gleb@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 2/2] KVM: VMX: fix memory order between loading vmcs and
 clearing vmcs

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@...ux.vnet.ibm.com>
> ---
>  arch/x86/kvm/vmx.c |   17 +++++++++++++++++
>  1 files changed, 17 insertions(+), 0 deletions(-)

Applied, thanks.

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