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

Boris Ostrovsky
2020-06-04T18:32:58Z

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@oracle.com>