* Re: [PATCH] iommu/vt-d: Disable DMAR for Intel Q35 IGFX
[not found] <20260410161622.13549-1-ari@naval.cat>
@ 2026-05-08 7:57 ` Baolu Lu
0 siblings, 0 replies; only message in thread
From: Baolu Lu @ 2026-05-08 7:57 UTC (permalink / raw)
To: Naval Alcalá
Cc: David Woodhouse, Joerg Roedel, Will Deacon, Robin Murphy,
open list:INTEL IOMMU (VT-d), open list
On 4/11/26 00:16, Naval Alcalá wrote:
> Intel Q35 integrated graphics (8086:29b2) exhibits broken DMAR
> behaviour similar to other G4x/GM45 devices for which DMAR is
> already disabled via quirks.
>
> When DMAR is enabled, the system may hard lock up during boot or
> early device initialization, requiring a reset.
>
> This issue has been reported multiple times and remains
> unresolved:
> Link:https://lore.kernel.org/linux-iommu/20161205215841.GA20819@beast/
> Link:https://bugzilla.kernel.org/show_bug.cgi?id=201185
> Link:https://bugzilla.kernel.org/show_bug.cgi?id=216064
>
> Add the missing PCI ID to the existing quirk list to disable
> DMAR for this device.
>
> Signed-off-by: Naval Alcalá<ari@naval.cat>
> ---
> drivers/iommu/intel/iommu.c | 3 +++
> 1 file changed, 3 insertions(+)
Queued for v7.1-rc. Thanks!
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