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Date: Mon, 6 Mar 2017 15:56:35 -0500 (EST)
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] Qemu deadlocks in tb_lock when using SVM+SoftMMU
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To: Alexander Boettcher <alexander.boettcher@genode-labs.com>
Cc: Alex =?utf-8?Q?Benn=C3=A9e?= <alex.bennee@linaro.org>, qemu-devel@nongnu.org, rth@twiddle.net, fred konrad <fred.konrad@greensocs.com>, crosthwaite peter <crosthwaite.peter@gmail.com>



----- Original Message -----
> From: "Alexander Boettcher" <alexander.boettcher@genode-labs.com>
> To: "Alex Benn=C3=A9e" <alex.bennee@linaro.org>
> Cc: qemu-devel@nongnu.org, rth@twiddle.net, "fred konrad" <fred.konrad@gr=
eensocs.com>, pbonzini@redhat.com,
> "crosthwaite peter" <crosthwaite.peter@gmail.com>
> Sent: Monday, March 6, 2017 9:11:04 PM
> Subject: Re: Qemu deadlocks in tb_lock when using SVM+SoftMMU
>=20
> Hello,
>=20
> thank you for your effort.
>=20
> With your patch I get now a 0x3f exception shown by the hypervisor,
> which I have never encountered so far before. The guest kernel seems not
> to start, at least no life sign is shown.
>=20
> For me the patch of Paolo Bonzini works reliable.

Let's use mine then. :)  I'll post it properly tomorrow.

Paolo

> How to proceed ?
>=20
> Thanks,
>=20
> Alex.
>=20
> On 06.03.2017 17:24, Alex Benn=C3=A9e wrote:
> >=20
> > Alexander Boettcher <alexander.boettcher@genode-labs.com> writes:
> >=20
> >> Hi,
> > <snip>
> >>
> >> Sometimes Qemu just succeeds if the timing is well, will see.
> >>
> >> But this is not the point of this issue atm.
> >=20
> > I've sent a patch that works as Richard suggested. However your test
> > image seems to run into other issues. I have tested it on my known good
> > x86 image and it works.
> >=20
> > However my knowledge of x86's interrupt architecture is fairly minimal
> > so I'm looking for testing/feedback on the patch.
> >=20
> >>
> >> Alex.
> >=20
> >=20
> > --
> > Alex Benn=C3=A9e
> >=20
>=20
> --
> Alexander Boettcher
> Genode Labs
>=20
> http://www.genode-labs.com - http://www.genode.org
>=20
> Genode Labs GmbH - Amtsgericht Dresden - HRB 28424 - Sitz Dresden
> Gesch=C3=A4ftsf=C3=BChrer: Dr.-Ing. Norman Feske, Christian Helmuth
>=20