linux-kernel - Re: [RFC 0/4] Virtio uses DMA API for all devices

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Message-ID: <53554e339b334b47d5822fb5219d5c878674b33c.camel@kernel.crashing.org>
Date:   Tue, 07 Aug 2018 10:18:07 +1000
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Will Deacon <will.deacon@....com>,
        Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        aik@...abs.ru, robh@...nel.org, joe@...ches.com,
        elfring@...rs.sourceforge.net, david@...son.dropbear.id.au,
        jasowang@...hat.com, mpe@...erman.id.au, linuxram@...ibm.com,
        haren@...ux.vnet.ibm.com, paulus@...ba.org,
        srikar@...ux.vnet.ibm.com, robin.murphy@....com,
        jean-philippe.brucker@....com, marc.zyngier@....com
Subject: Re: [RFC 0/4] Virtio uses DMA API for all devices

On Tue, 2018-08-07 at 02:45 +0300, Michael S. Tsirkin wrote:
> > OK well, assuming Christoph can solve the direct case in a way that
> > also work for the virtio !iommu case, we still want some bit of logic
> > somewhere that will "switch" to swiotlb based ops if the DMA mask is
> > limited.
> > 
> > You mentioned an RFC for that ? Do you happen to have a link ?
> 
> No but Christoph did I think.

Ok I missed that, sorry, I'll dig it out. Thanks.

Cheers,
Ben.