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Re: [Qemu-devel] Would virtio support 64 bit address for vring virtqueue

From: Rusty Russell
Subject: Re: [Qemu-devel] Would virtio support 64 bit address for vring virtqueue?
Date: Wed, 04 Sep 2013 16:22:55 +0930
User-agent: Notmuch/0.15.2+81~gd2c8818 (http://notmuchmail.org) Emacs/23.4.1 (i686-pc-linux-gnu)

"Xie, Huawei" <address@hidden> writes:
> If this is the case, one possible fix would be:
>       Write two continuous 32bit DWORD to combine a 64bit address
>       Use the upper 12 bits of PFN val to indicate if it is combined write
> In this way, we wouldn't break other virtio driver, register layout
> and only need a few lines of modification.

Note that (with OASIS) we are currently working on a v1.0 of the virtio
spec.  I recommend the OASIS virtio-dev mailing list
( https://www.oasis-open.org/mlmanage/ ) and in particular the thread on
Michael Tsirkin's proposal on using PCI capabilities:



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