RE: [PATCH 1/1] iommu/vt-d: Make context clearing consistent with context mapping

[Tian, Kevin]

> From: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
> Sent: Tuesday, November 14, 2023 9:11 AM
> 
> In the iommu probe_device path, domain_context_mapping() allows setting
> up the context entry for a non-PCI device. However, in the iommu
> release_device path, domain_context_clear() only clears context entries
> for PCI devices.
> 
> Make domain_context_clear() behave consistently with
> domain_context_mapping() by clearing context entries for both PCI and
> non-PCI devices.
> 
> Fixes: 579305f75d34 ("iommu/vt-d: Update to use PCI DMA aliases")
> Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>

The code before the fix tag also has the same problem. If we really want
backport then let's find out the very first commit which exhibits this
problem.

But I wonder the actual impact w/o such fix. If there is no hot-remove
possible for those non-PCI devices the context entry will be leaved
enabled until the machine is off. Then this fix is nice-to-have then
probably no need to backport?