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

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Message-ID: <alpine.DEB.2.21.2005201653310.27502@sstabellini-ThinkPad-T480s>
Date:   Wed, 20 May 2020 16:56:19 -0700 (PDT)
From:   Stefano Stabellini <sstabellini@...nel.org>
To:     Roman Shaposhnik <roman@...eda.com>
cc:     Stefano Stabellini <sstabellini@...nel.org>,
        Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Konrad Wilk <konrad.wilk@...cle.com>,
        Xen-devel <xen-devel@...ts.xenproject.org>,
        linux-kernel@...r.kernel.org, tamas@...engyel.com
Subject: Re: [PATCH 00/10] fix swiotlb-xen for RPi4

On Wed, 20 May 2020, Roman Shaposhnik wrote:
> On Wed, May 20, 2020 at 4:45 PM Stefano Stabellini
> <sstabellini@...nel.org> 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