linux-kernel - Re: [RFC PATCH] virtio_ring: Use DMA API if guest memory is encrypted

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Message-Id: <87y30wj9jt.fsf@morokweng.localdomain>
Date:   Thu, 18 Jul 2019 00:39:18 -0300
From:   Thiago Jung Bauermann <bauerman@...ux.ibm.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Mike Anderson <andmike@...ux.ibm.com>,
        Michael Roth <mdroth@...ux.vnet.ibm.com>,
        Jean-Philippe Brucker <jean-philippe.brucker@....com>,
        Jason Wang <jasowang@...hat.com>,
        Alexey Kardashevskiy <aik@...ux.ibm.com>,
        Ram Pai <linuxram@...ibm.com>, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        iommu@...ts.linux-foundation.org, Christoph Hellwig <hch@....de>,
        David Gibson <david@...son.dropbear.id.au>
Subject: Re: [RFC PATCH] virtio_ring: Use DMA API if guest memory is encrypted


Hello,

Just going back to this question which I wasn't able to answer.

Thiago Jung Bauermann <bauerman@...ux.ibm.com> writes:

> Michael S. Tsirkin <mst@...hat.com> writes:
>
>> So far so good, but now a question:
>>
>> how are we handling guest address width limitations?
>> Is VIRTIO_F_ACCESS_PLATFORM_IDENTITY_ADDRESS subject to
>> guest address width limitations?
>> I am guessing we can make them so ...
>> This needs to be documented.
>
> I'm not sure. I will get back to you on this.

We don't have address width limitations between host and guest.

--
Thiago Jung Bauermann
IBM Linux Technology Center