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RE: [PATCH v2] IOMMU/VT-d: Fix iommu=no-igfx if the IOMMU scope contains phantom device
- To: "Marczykowski, Marek" <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
- Date: Tue, 14 Mar 2023 01:50:11 +0000
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- Cc: "Marczykowski, Marek" <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 14 Mar 2023 01:50:30 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Thread-index: AQHZVhT1Y3FxVamQLkqJ4quzo6CpTK75glJQ
- Thread-topic: [PATCH v2] IOMMU/VT-d: Fix iommu=no-igfx if the IOMMU scope contains phantom device
> From: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
> Sent: Tuesday, March 14, 2023 9:32 AM
>
> If the scope for IGD's IOMMU contains additional device that doesn't
> actually exist, iommu=no-igfx would not disable that IOMMU. In this
> particular case (Thinkpad x230) it included
> 00:02.1, but there is no such device on this platform.
> Consider only existing devices for "gfx only" check.
>
> Fixes: 2d7f191b392e ("VT-d: generalize and correct "iommu=no-igfx"
> handling")
> Signed-off-by: Marek Marczykowski-Górecki
> <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
this should be rebased on top of Jan's patch.
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
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