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Subject: Re: [RFC PATCH] iommu/amd: fix a race in fetch_pte()
From:   Qian Cai <cai@lca.pw>
In-Reply-To: <20200429112014.GN21900@8bytes.org>
Date:   Wed, 29 Apr 2020 21:04:29 -0400
Cc:     iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org
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References: <20200418121022.GA6113@8bytes.org>
 <57CBF6B2-4745-4E36-9AA5-7E0876E3DA8F@lca.pw>
 <20200418183429.GH21900@8bytes.org>
 <7D03A3E2-647B-4FAD-886D-EE2764EC1EDB@lca.pw>
 <20200429112014.GN21900@8bytes.org>
To:     Joerg Roedel <joro@8bytes.org>
Sender: linux-kernel-owner@vger.kernel.org
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> On Apr 29, 2020, at 7:20 AM, Joerg Roedel <joro@8bytes.org> wrote:
>=20
> On Mon, Apr 20, 2020 at 09:26:12AM -0400, Qian Cai wrote:
>> No dice. There could be some other races. For example,
>=20
> Can you please test this branch:
>=20
> 	=
https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git/log/?h=3Dam=
d-iommu-fixes
>=20
> It has the previous fix in it and a couple more to make sure the
> device-table is updated and flushed before increase_address_space()
> updates domain->pt_root.

It looks promising as it survives for a day=E2=80=99s stress testing. =
I=E2=80=99ll keep it running for a few days to be sure.=