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

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Message-ID: <4ACE1598.6050200@redhat.com>
Date:	Thu, 08 Oct 2009 18:38:48 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Joerg Roedel <joerg.roedel@....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 10/08/2009 06:32 PM, Joerg Roedel wrote:
> No. The L1 guest needs to execute VMRUN with an interrupt to inject to
> the L2 guest with event_inj. On that VMRUN instruction emulation an
> interrupt becomes pending which causes an immediate #vmexit from L2 to
> L2 again without even entering the L2 guest. The bug was that in this
> case the event which the L1 tried to inject in the L2 was lost because
> it was not copied to exit_int_info.
>    

(from L1 to L0?)

Wow.  Alex, how did you find this?

We can try to cause an interrupt using a signal from another thread, but 
that's too difficult as the first test in a test suite.

-- 
error compiling committee.c: too many arguments to function

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