> From: Jan Beulich <jbeulich@suse.com>
> Sent: Wednesday, September 15, 2021 5:13 PM
>
> Doing the cleanup also for phantom devices is at best redundant with
> doing it for the corresponding real device. I couldn't force myself into
> checking all the code paths whether it really is: It seems better to
> explicitly skip this step in such cases.
>
> Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
>
> --- a/xen/drivers/passthrough/vtd/iommu.c
> +++ b/xen/drivers/passthrough/vtd/iommu.c
> @@ -1733,7 +1733,7 @@ static int domain_context_unmap(struct d
> return -EINVAL;
> }
>
> - if ( ret || QUARANTINE_SKIP(domain) )
> + if ( ret || QUARANTINE_SKIP(domain) || pdev->devfn != devfn )
> return ret;
>
> /*