From mboxrd@z Thu Jan  1 00:00:00 1970
From: Rusty Russell <rusty@rustcorp.com.au>
Subject: Re: virtio-pci new configuration proposal
Date: Mon, 07 Nov 2011 15:46:23 +1030
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To: "Michael S. Tsirkin" <mst@redhat.com>, Sasha Levin <levinsasha928@gmail.com>
Cc: Anthony Liguori <anthony@codemonkey.ws>, linux-kernel <linux-kernel@vger.kernel.org>, kvm <kvm@vger.kernel.org>, virtualization <virtualization@lists.linux-foundation.org>
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On Sun, 6 Nov 2011 23:38:49 +0200, "Michael S. Tsirkin" <mst@redhat.com> wrote:
> On Sun, Nov 06, 2011 at 10:24:57PM +0200, Sasha Levin wrote:
> > On Sun, 2011-11-06 at 09:30 +0200, Michael S. Tsirkin wrote:
> > > On Fri, Nov 04, 2011 at 04:53:05PM +0200, Sasha Levin wrote:
> > > > > I guess my assumption is that most options will be in use,
> > > > > not discarded dead-ends.
> > > > 
> > > > I don't know about that. 64 bit features would be pretty rare for now -
> > > > and I don't think that setting the alignment will be also enabled by
> > > > default.

The truth is somewhere between.  New features tend to be used, and
importantly, they have to be offered.

Anyway, the *per-device* config part will be contiguous.  So we're
talking about pci-specific features.

So far, the only three things make sense to have in a capability list:
MSI-X, the upper 32 feature bits, and the per-device config.

Thanks,
Rusty.