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

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Date:   Tue, 2 Jun 2020 14:51:02 -0700 (PDT)
From:   Stefano Stabellini <sstabellini@...nel.org>
To:     jgross@...e.com, boris.ostrovsky@...cle.com, konrad.wilk@...cle.com
cc:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        tamas@...engyel.com, roman@...eda.com, sstabellini@...nel.org
Subject: Re: [PATCH 00/10] fix swiotlb-xen for RPi4

I would like to ask the maintainers, Juergen, Boris, Konrad, whether you
have any more feedback before I send v2 of the series.

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
>