linux-kernel - Re: [PATCH v2 00/11] fix swiotlb-xen for RPi4

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Date:   Thu, 4 Jun 2020 14:32:43 -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, julien.grall@....com
Subject: Re: [PATCH v2 00/11] fix swiotlb-xen for RPi4

On 6/3/20 6:22 PM, 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


(+ Julien)


Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>