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

[Stefano Stabellini]

On Wed, 20 May 2020, Roman Shaposhnik wrote:
> On Wed, May 20, 2020 at 4:45 PM Stefano Stabellini
> <sstabellini@xxxxxxxxxx> 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.
> 
> Great to see this! Stefano, any chance you can put it in a branch some place
> so I can test the final version?

Here it is, but keep in mind that it is based on Linux master (because
it is meant to go upstream):

  git://git.kernel.org/pub/scm/linux/kernel/git/sstabellini/xen.git fix-rip4-v1