linux-kernel - Re: [PATCH] KVM: SVM: fix NMI window after iret

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Date:	Fri, 17 Jan 2014 12:18:31 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Radim Krčmář <rkrcmar@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org, joro@...tes.org,
	pbonzini@...hat.com, stable@...r.kernel.org
Subject: Re: [PATCH] KVM: SVM: fix NMI window after iret

On Fri, Jan 17, 2014 at 08:52:42PM +0100, Radim Krčmář wrote:
> We should open NMI window right after an iret, but SVM exits before it.
> We wanted to single step using the trap flag and then open it.
> (or we could emulate the iret instead)
> We don't do it since commit 3842d135ff2 (likely), because the iret exit
> handler does not request an event, so NMI window remains closed until
> the next exit.
> 
> Fix this by making KVM_REQ_EVENT request in the iret handler.
> 
> Signed-off-by: Radim Krčmář <rkrcmar@...hat.com>
> ---
>  (btw. kvm-unit-tests weren't executed on SVM since Nov 2010, at least)
> 
>  arch/x86/kvm/svm.c | 1 +
>  1 file changed, 1 insertion(+)


<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read Documentation/stable_kernel_rules.txt
for how to do this properly.

</formletter>
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