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Re: [Xen-devel] [PATCH for-4.13 v2] passthrough: simplify locking and logging
- To: "Durrant, Paul" <pdurrant@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 4 Nov 2019 11:06:11 +0000
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- Cc: "jgross@xxxxxxxx" <jgross@xxxxxxxx>, Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>, "jbeulich@xxxxxxxx" <jbeulich@xxxxxxxx>
- Delivery-date: Mon, 04 Nov 2019 11:06:36 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 04/11/2019 08:31, Durrant, Paul wrote:
>> -----Original Message-----
>> From: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>
>> Sent: 01 November 2019 19:28
>> To: xen-devel@xxxxxxxxxxxxxxxxxxxx
>> Cc: Durrant, Paul <pdurrant@xxxxxxxxxx>; jbeulich@xxxxxxxx;
>> jgross@xxxxxxxx
>> Subject: [PATCH for-4.13 v2] passthrough: simplify locking and logging
>>
>> From: Paul Durrant <pdurrant@xxxxxxxxxx>
>>
>> Dropping the pcidevs lock between calling device_assigned() and
>> assign_device() means that the latter has to do the same check as the
>> former for no obvious gain. Also, since long running operations under
>> pcidevs lock already drop the lock and return -ERESTART periodically there
>> is little point in immediately failing an assignment operation with
>> -ERESTART just because the pcidevs lock could not be acquired (for the
>> second time, having already blocked on acquiring the lock in
>> device_assigned()).
>>
>> This patch instead acquires the lock once for assignment (or test assign)
>> operations directly in iommu_do_pci_domctl() and thus can remove the
>> duplicate domain ownership check in assign_device(). Whilst in the
>> neighbourhood, the patch also removes some debug logging from
>> assign_device() and deassign_device() and replaces it with proper error
>> logging, which allows error logging in iommu_do_pci_domctl() to be
>> removed. Also, since device_assigned() can tell the difference between a
>> guest assigned device and a non-existent one, log the actual error
>> condition rather then being ambiguous for the sake a few extra lines of
>> code.
>>
>> Signed-off-by: Paul Durrant <pdurrant@xxxxxxxxxx>
>> ---
>>
>> This is XSA-302 followup and contains some changes important for
>> XenServer.
>> Juergen, could this be considered for 4.13 inclusion?
>>
>> v2: updated Paul's email address
This was work you did at Citrix, yes?
> Reviewed-by: Paul Durrant <pdurrant@xxxxxxxxxx>
SoB and R-by?
~Andrew
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