From: Jason Gunthorpe <jgg@nvidia.com>
To: Matthew Rosato <mjrosato@linux.ibm.com>
Cc: Alex Williamson <alex.williamson@redhat.com>,
Cornelia Huck <cohuck@redhat.com>,
iommu@lists.linux.dev, Joerg Roedel <joro@8bytes.org>,
kvm@vger.kernel.org, Will Deacon <will@kernel.org>,
Qian Cai <cai@lca.pw>, Joerg Roedel <jroedel@suse.de>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Robin Murphy <robin.murphy@arm.com>
Subject: Re: [PATCH 0/4] Fix splats releated to using the iommu_group after destroying devices
Date: Fri, 9 Sep 2022 13:24:15 -0300 [thread overview]
Message-ID: <Yxtor2eUxbHSZQgi@nvidia.com> (raw)
In-Reply-To: <28f45073-0047-3f8a-c79f-6dd6cc1d4117@linux.ibm.com>
On Fri, Sep 09, 2022 at 08:49:40AM -0400, Matthew Rosato wrote:
> On 9/8/22 2:44 PM, Jason Gunthorpe wrote:
> > The basic issue is that the iommu_group is being used by VFIO after all
> > the device drivers have been removed.
> >
> > In part this is caused by bad logic inside the iommu core that doesn't
> > sequence removing the device from the group properly, and in another part
> > this is bad logic in VFIO continuing to use device->iommu_group after all
> > VFIO device drivers have been removed.
> >
> > Fix both situations. Either fix alone should fix the bug reported, but
> > both together bring a nice robust design to this area.
> >
> > This is a followup from this thread:
> >
> > https://lore.kernel.org/kvm/20220831201236.77595-1-mjrosato@linux.ibm.com/
> >
> > Matthew confirmed an earlier version of the series solved the issue, it
> > would be best if he would test this as well to confirm the various changes
> > are still OK.
>
> FYI I've been running this series (+ the incremental to patch 4 you
> mentioned) against my original repro scenario in a loop overnight,
> looks good.
Thanks Matthew, looks like we need some more time on the last patch
but I think the VFIO ones are OK if Alex wants to pick them before LPC
is over.
Jason
prev parent reply other threads:[~2022-09-09 16:24 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-08 18:44 [PATCH 0/4] Fix splats releated to using the iommu_group after destroying devices Jason Gunthorpe
2022-09-08 18:44 ` [PATCH 1/4] vfio: Simplify vfio_create_group() Jason Gunthorpe
2022-09-20 19:45 ` Matthew Rosato
2022-09-08 18:44 ` [PATCH 2/4] vfio: Move the sanity check of the group to vfio_create_group() Jason Gunthorpe
2022-09-22 19:10 ` Alex Williamson
2022-09-22 19:36 ` Jason Gunthorpe
2022-09-22 21:23 ` Alex Williamson
2022-09-22 23:12 ` Jason Gunthorpe
2022-09-08 18:45 ` [PATCH 3/4] vfio: Follow a strict lifetime for struct iommu_group * Jason Gunthorpe
2022-09-20 19:32 ` Matthew Rosato
2022-09-08 18:45 ` [PATCH 4/4] iommu: Fix ordering of iommu_release_device() Jason Gunthorpe
2022-09-08 21:05 ` Robin Murphy
2022-09-08 21:27 ` Robin Murphy
2022-09-08 21:43 ` Jason Gunthorpe
2022-09-09 9:05 ` Robin Murphy
2022-09-09 13:25 ` Jason Gunthorpe
2022-09-09 17:57 ` Robin Murphy
2022-09-09 18:30 ` Jason Gunthorpe
2022-09-09 19:55 ` Robin Murphy
2022-09-09 23:45 ` Jason Gunthorpe
2022-09-12 11:13 ` Robin Murphy
2022-09-22 16:56 ` Jason Gunthorpe
2022-09-09 12:49 ` [PATCH 0/4] Fix splats releated to using the iommu_group after destroying devices Matthew Rosato
2022-09-09 16:24 ` Jason Gunthorpe [this message]
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