linux-kernel - Re: [PATCH 00/10] fix swiotlb-xen for RPi4

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Date:   Tue, 2 Jun 2020 20:15:40 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Stefano Stabellini <sstabellini@...nel.org>, jgross@...e.com,
        konrad.wilk@...cle.com
Cc:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        tamas@...engyel.com, roman@...eda.com
Subject: Re: [PATCH 00/10] fix swiotlb-xen for RPi4

On 6/2/20 5:51 PM, Stefano Stabellini wrote:
> I would like to ask the maintainers, Juergen, Boris, Konrad, whether you
> have any more feedback before I send v2 of the series.


I think I only had one comment and that's all. Most were from Julien.


-boris


>
> Cheers,
>
> Stefano
>
>
> On Wed, 20 May 2020, Stefano Stabellini wrote:
>> Hi all,
>>
>> This series is a collection of fixes to get Linux running on the RPi4 as
>> dom0.
>>
>> Conceptually there are only two significant changes:
>>
>> - make sure not to call virt_to_page on vmalloc virt addresses (patch
>>   #1)
>> - use phys_to_dma and dma_to_phys to translate phys to/from dma
>>   addresses (all other patches)
>>
>> In particular in regards to the second part, the RPi4 is the first
>> board where Xen can run that has the property that dma addresses are
>> different from physical addresses, and swiotlb-xen was written with the
>> assumption that phys addr == dma addr.
>>
>> This series adds the phys_to_dma and dma_to_phys calls to make it work.
>>
>>
>> Cheers,
>>
>> Stefano
>>