linux-kernel - Re: [PATCH] xen: introduce xen_vring_use

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Date:   Mon, 29 Jun 2020 02:33:39 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Peng Fan <peng.fan@....com>
Cc:     Stefano Stabellini <sstabellini@...nel.org>,
        "boris.ostrovsky@...cle.com" <boris.ostrovsky@...cle.com>,
        "jgross@...e.com" <jgross@...e.com>,
        "konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH] xen: introduce xen_vring_use_dma

On Mon, Jun 29, 2020 at 06:25:41AM +0000, Peng Fan wrote:
> > > > > Anyway, re-reading the last messages of the original thread [1],
> > > > > it looks like Peng had a clear idea on how to fix the general issue.
> > > > > Peng, what happened with that?
> > >
> > > We shrinked the rpmsg reserved area to workaround the issue.
> > > So still use the dma apis in rpmsg.
> > >
> > > But here I am going to address domu android trusty issue using virtio.
> > 
> > My suggestion is to first of all fix DMA API so it works properly.
> 
> Could you please elaborate more details?
> 
> You mean the DMA API usage of rpmsg? Or xen domu dma_ops?
> 
> Thanks,
> Peng. 

Not 100% sure but I think xen dma ops.

-- 
MST