linux-kernel - Re: [PATCH 1/8] KVM: SVM: Fix nested nmi handling

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Message-ID: <20100423143159.GJ31537@amd.com>
Date:	Fri, 23 Apr 2010 16:31:59 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Alexander Graf <agraf@...e.de>
CC:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/8] KVM: SVM: Fix nested nmi handling

On Fri, Apr 23, 2010 at 04:24:54PM +0200, Alexander Graf wrote:
> 
> On 23.04.2010, at 16:22, Joerg Roedel wrote:

> > No, nested_svm_nmi runs in atomic context where we can't emulate a
> > vmexit. We set exit_required and emulate the vmexit later.
> 
> So we modify the L2 rflags and then trigger a #vmexit, leaving the l2
> state broken?

No, the rflags are changed in enable_nmi_window which isn't called when
we run nested and the nested hypervisor intercepts nmi. So it only runs
in the !nested case where it can't corrupt L2 state.

	Joerg


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