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

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Message-ID: <7fdcb1cb2900755a6534199a675483f60beb47fc.camel@kernel.crashing.org>
Date:   Sun, 05 Aug 2018 10:53:33 +1000
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     Christoph Hellwig <hch@...radead.org>,
        "Michael S. Tsirkin" <mst@...hat.com>
Cc:     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 Sat, 2018-08-04 at 01:15 -0700, Christoph Hellwig wrote:
>   b) a way to document in a virtio-related spec how the bus handles
>      dma for Ben's totally fucked up hypervisor.  Without that there
>      is not way we'll get interoperable implementations.

Christoph, this isn't a totally fucked up hypervisor. It's not even
about the hypervisor itself, I mean seriously, man, can you at least
bother reading what I described is going on with the security
architecture ?

Anyway, Michael is onto what could possibly be an alternative approach,
by having us tell qemu to flip to iommu mode at secure VM boot time.
Let's see where that leads.

Cheers,
Ben.