linux-kernel - Re: [PATCH 1/1] iommu/vt-d: Fix incorrect pci_for_each_dma

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Message-ID: <20241014171011.GA612212@bhelgaas>
Date: Mon, 14 Oct 2024 12:10:11 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Baolu Lu <baolu.lu@...ux.intel.com>
Cc: Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
	Robin Murphy <robin.murphy@....com>,
	Kevin Tian <kevin.tian@...el.com>,
	Todd Brandt <todd.e.brandt@...el.com>, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Marcin Mirosław <marcin@...or.pl>
Subject: Re: [PATCH 1/1] iommu/vt-d: Fix incorrect pci_for_each_dma_alias()
 for non-PCI devices

[+cc Marcin]

On Mon, Oct 14, 2024 at 09:39:20AM +0800, Baolu Lu wrote:
> On 2024/10/12 11:07, Lu Baolu wrote:
> > Previously, the domain_context_clear() function incorrectly called
> > pci_for_each_dma_alias() to set up context entries for non-PCI devices.
> > This could lead to kernel hangs or other unexpected behavior.
> > 
> > Add a check to only call pci_for_each_dma_alias() for PCI devices. For
> > non-PCI devices, domain_context_clear_one() is called directly.
> > 
> > Reported-by: Todd Brandt<todd.e.brandt@...el.com>
> > Closes:https://bugzilla.kernel.org/show_bug.cgi?id=219363
> > Fixes: 9a16ab9d6402 ("iommu/vt-d: Make context clearing consistent with context mapping")
> > Cc:stable@...r.kernel.org
> > Signed-off-by: Lu Baolu<baolu.lu@...ux.intel.com>
> > ---
> >   drivers/iommu/intel/iommu.c | 4 +++-
> >   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> Queued for v6.12-rc.

Please include information about Marcin's report as well (assuming it
is the same problem).  Marcin did a LOT of work to report and bisect
this, so both should be acknowledged here.

See https://bugzilla.kernel.org/show_bug.cgi?id=219349

Bjorn