linux-kernel - Re: [PATCH 1/2] KVM: VMX: fix invalid cpu passed to smp_call_function

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Message-ID: <20121129000602.GB17264@amt.cnet>
Date:	Wed, 28 Nov 2012 22:06:02 -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 1/2] KVM: VMX: fix invalid cpu passed to
 smp_call_function_single

On Wed, Nov 28, 2012 at 08:53:15PM +0800, Xiao Guangrong wrote:
> In loaded_vmcs_clear, loaded_vmcs->cpu is the fist parameter passed to
> smp_call_function_single, if the target cpu is downing (doing cpu hot remove),
> loaded_vmcs->cpu can become -1 then -1 is passed to smp_call_function_single
> 
> It can be triggered when vcpu is being destroyed, loaded_vmcs_clear is called
> in the preemptionable context
> 
> Signed-off-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
> ---
>  arch/x86/kvm/vmx.c |    8 +++++---
>  1 files changed, 5 insertions(+), 3 deletions(-)

Applied, thanks.

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