From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jan Kiszka <jan.kiszka@web.de>
Subject: Re: [PATCH 05/15] Coalesce userspace/kernel irqchip interrupt   injection
 logic.
Date: Sat, 18 Apr 2009 11:16:47 +0200
Message-ID: <49E99A7F.7000902@web.de>
References: <1239616545-25199-1-git-send-email-gleb@redhat.com>	<1239616545-25199-6-git-send-email-gleb@redhat.com> <gsa2r0$8c0$2@ger.gmane.org>
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Cc: kvm@vger.kernel.org, Gleb Natapov <gleb@redhat.com>,
	Avi Kivity <avi@redhat.com>,
	Joerg Roedel <joerg.roedel@amd.com>
To: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
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Dmitry Eremin-Solenikov wrote:
> Gleb Natapov wrote:
>=20
>> Start to use interrupt/exception queues like VMX does. This also fix t=
he
>> bug that if exit was caused by a guest internal exception access to ID=
T
>> the exception was not reinjected.
>>
>=20
>=20
> OK. On real SVM HW this seems to work. However now i'm stumbled upon an=
other
> problem wrt. NMI. See another mail.
>=20

I can confirm that this series (probably this patch) breaks the
following scenario:

qemu-system-x86_64 (qemu trunk, emulation mode)
    linux (kvm.git) with kvm-amd + kvm-userspace
        linux (the same kvm.git)

The second-level guest hangs in the mid of its boot, maybe no longer
receiving some or any interrupt.

So this patch may either expose a bug in the svm emulation of qemu or
comes with a subtle regression that only triggers due to qemu's timing.
This needs to be understood. Gleb, any progress on reproducing it on
your side?

Jan


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