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

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Message-ID: <DB6PR0402MB27606A2A6308135D62476D80886E0@DB6PR0402MB2760.eurprd04.prod.outlook.com>
Date:   Mon, 29 Jun 2020 06:35:48 +0000
From:   Peng Fan <peng.fan@....com>
To:     "Michael S. Tsirkin" <mst@...hat.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

> 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.

Sorry to ask again, could you explain more details about what issues
do you see of current xen ARM domu dma_ops? 
Or Dom0 swiotlb xen dma_ops?

Thanks,
Pen.g

> 
> --
> MST