linux-kernel - Re: [RFC PATCH] iommu/amd: fix a race in fetch

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Date:   Wed, 29 Apr 2020 21:04:29 -0400
From:   Qian Cai <cai@....pw>
To:     Joerg Roedel <joro@...tes.org>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] iommu/amd: fix a race in fetch_pte()



> On Apr 29, 2020, at 7:20 AM, Joerg Roedel <joro@...tes.org> wrote:
> 
> On Mon, Apr 20, 2020 at 09:26:12AM -0400, Qian Cai wrote:
>> No dice. There could be some other races. For example,
> 
> Can you please test this branch:
> 
> 	https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git/log/?h=amd-iommu-fixes
> 
> 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’s stress testing. I’ll keep it running for a few days to be sure.