linux-kernel - Re: [PATCH 1/9] KVM: SVM: Notify nested hypervisor of lost event injections

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Date:	Thu, 8 Oct 2009 18:22:22 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Avi Kivity <avi@...hat.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	Alexander Graf <agraf@...e.de>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/9] KVM: SVM: Notify nested hypervisor of lost event
 injections

On Thu, Oct 08, 2009 at 06:12:28PM +0200, Avi Kivity wrote:
> On 10/08/2009 12:03 PM, Joerg Roedel wrote:
> >From: Alexander Graf<agraf@...e.de>
> >
> >If event_inj is valid on a #vmexit the host CPU would write
> >the contents to exit_int_info, so the hypervisor knows that
> >the event wasn't injected.
> >
> >We don't do this in nested SVM by now which is a bug and
> >fixed by this patch.
> 
> We need to start thinking about regression tests for these bugs.  It
> would be relatively easy to set up something with save->cr3 == cr3
> (i.e. no isolation, mmu virtualization, etc.).

Should be doable with a in-kernel regression test-suite module, I think.
Triggering such (race-condition like) test cases from userspace is
somewhat hard.

	Joerg


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