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Re: [PATCH v2 0.9/2] VT-d: don't needlessly look up DID
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Thu, 7 Apr 2022 11:40:56 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Kevin Tian <kevin.tian@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Paul Durrant <paul@xxxxxxx>
- Delivery-date: Thu, 07 Apr 2022 09:41:23 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Thu, Apr 07, 2022 at 11:27:53AM +0200, Jan Beulich wrote:
> If get_iommu_domid() in domain_context_unmap_one() fails, we better
> wouldn't clear the context entry in the first place, as we're then unable
> to issue the corresponding flush. However, we have no need to look up the
> DID in the first place: What needs flushing is very specifically the DID
> that was in the context entry before our clearing of it.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Thanks, Roger.
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