[PATCH] swiotlb-xen: fix DMA_ATTR_NO_KERNEL_MAPPING on arm

[Boris Ostrovsky]

On 4/28/22 6:49 PM, Stefano Stabellini wrote:
> On Thu, 28 Apr 2022, Boris Ostrovsky wrote:
>> On 4/28/22 5:49 PM, Stefano Stabellini wrote:
>>> On Thu, 28 Apr 2022, Christoph Hellwig wrote:
>>>> On Tue, Apr 26, 2022 at 04:07:45PM -0700, Stefano Stabellini wrote:
>>>>>> Reported-by: Rahul Singh <Rahul.Singh at arm.com>
>>>>>> Signed-off-by: Christoph Hellwig <hch at lst.de>
>>>>> Reviewed-by: Stefano Stabellini <sstabellini at kernel.org>
>>>> Do you want to take this through the Xen tree or should I pick it up?
>>>> Either way I'd love to see some testing on x86 as well.
>>> I agree on the x86 testing. Juergen, Boris?
>>>
>>> I'd say to take this patch via the Xen tree but Juergen has just sent a
>>> Xen pull request to Linux last Saturday. Juergen do you plan to send
>>> another one? Do you have something else lined up? If not, it might be
>>> better to let Christoph pick it up.
>>
>> We don't have anything pending.
>>
>>
>> I can test it but at best tomorrow so not sure we can get this into rc5. Do
>> you consider this an urgent fix or can we wait until 5.19? Because it's a bit
>> too much IMO for rc6.
> On one hand, Linux doesn't boot on a platform without this fix. On the
> other hand, I totally see that this patch could introduce regressions on
> x86 so I think it is fair that we are careful with it.
>
>  From my point of view, it might be better to wait for 5.19 and mark it
> as backport.


No problems uncovered during testing.


-boris