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Re: [PATCH v7 6/7] xen/arm: process pending vPCI map/unmap operations
- To: Julien Grall <julien@xxxxxxx>
- From: Oleksandr Andrushchenko <Oleksandr_Andrushchenko@xxxxxxxx>
- Date: Tue, 7 Dec 2021 11:57:21 +0000
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Oleksandr Andrushchenko <Oleksandr_Andrushchenko@xxxxxxxx>, "paul@xxxxxxx" <paul@xxxxxxx>
- Delivery-date: Tue, 07 Dec 2021 11:58:05 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH v7 6/7] xen/arm: process pending vPCI map/unmap operations
Hi, Julien!
On 03.12.21 18:10, Durrant, Paul wrote:
> On 23/11/2021 23:59, Oleksandr Andrushchenko wrote:
>> From: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
>>
>> vPCI may map and unmap PCI device memory (BARs) being passed through which
>> may take a lot of time. For this those operations may be deferred to be
>> performed later, so that they can be safely preempted.
>>
>> Currently this deferred processing is happening in common IOREQ code
>> which doesn't seem to be the right place for x86 and is even more
>> doubtful because IOREQ may not be enabled for Arm at all.
>> So, for Arm the pending vPCI work may have no chance to be executed
>> if the processing is left as is in the common IOREQ code only.
>> For that reason make vPCI processing happen in arch specific code.
>>
>> Please be aware that there are a few outstanding TODOs affecting this
>> code path, see xen/drivers/vpci/header.c:map_range and
>> xen/drivers/vpci/header.c:vpci_process_pending.
>>
>> Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
>> [x86 part]
>> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
>> Reviewed-by: Julien Grall <jgrall@xxxxxxxxxx>
>
> Reviewed-by: Paul Durrant <paul@xxxxxxx>
>
Do we need anything else for this patch?
Thank you,
Oleksandr
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