RE: [PATCH v7 5/5] iommu/vt-d: Fail probe on ATS configuration failure

[Tian, Kevin]

> From: Pranjal Shrivastava <praan@xxxxxxxxxx>
> Sent: Monday, June 1, 2026 10:37 PM
> 
> Update the Intel VT-d driver to handle ATS configuration and enablement
> more strictly. Specifically, update the device probe to fail if
> pci_prepare_ats() returns an error. This ensures that any ATS-capable
> master reaching the attach phase is guaranteed to have a valid config.
> 
> Additionally, update iommu_enable_pci_ats() to WARN() if pci_enable_ats
> fails. Since earlier checks in the probe phase preclude config-related
> failures, any failure during hardware enablement is considered a kernel
> bug.
> 
> Signed-off-by: Pranjal Shrivastava <praan@xxxxxxxxxx>

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>