Re: [Xen-devel] [PATCH 1/3] xen/tools: Add 64 bits big bar support

["Hao, Xudong" <xudong.hao@xxxxxxxxx>]

> -----Original Message-----
> From: Stefano Stabellini [mailto:stefano.stabellini@xxxxxxxxxxxxx]
> Sent: Thursday, August 16, 2012 6:11 PM
> To: Hao, Xudong
> Cc: Stefano Stabellini; xen-devel@xxxxxxxxxxxxx; Ian Jackson; Zhang, Xiantao;
> Anthony PERARD
> Subject: RE: [Xen-devel] [PATCH 1/3] xen/tools: Add 64 bits big bar support
> 
> On Thu, 16 Aug 2012, Hao, Xudong wrote:
> > > -----Original Message-----
> > > From: Stefano Stabellini [mailto:stefano.stabellini@xxxxxxxxxxxxx]
> > > Sent: Wednesday, August 15, 2012 6:21 PM
> > > To: Hao, Xudong
> > > Cc: xen-devel@xxxxxxxxxxxxx; Ian Jackson; Zhang, Xiantao
> > > Subject: Re: [Xen-devel] [PATCH 1/3] xen/tools: Add 64 bits big bar 
> > > support
> > >
> > > On Wed, 15 Aug 2012, Xudong Hao wrote:
> > > > Currently it is assumed PCI device BAR access < 4G memory. If there is
> such a
> > > > device whose BAR size is larger than 4G, it must access > 4G memory
> > > address.
> > > > This patch enable the 64bits big BAR support on hvmloader.
> > > >
> > > > Signed-off-by: Xiantao Zhang <xiantao.zhang@xxxxxxxxx>
> > > > Signed-off-by: Xudong Hao <xudong.hao@xxxxxxxxx>
> > >
> > > It is very good to see that this problem has been solved!
> > >
> > > Considering that at this point it is too late for the 4.2 release cycle,
> > > it might be worth spinning a version of this patches for SeaBIOS and
> > > upstream QEMU, that now supports PCI passthrough.
> > >
> >
> > Hi, Stefano
> >
> > Does Xen already switch to SeaBIOS and upstream QEMU? I saw SeaBIOS
> does not update for 5 months.
> 
> Yes, they are available but not the default yet for HVM guests.
> In order to enable upstream QEMU you need to pass:
> 
> device_model_version='qemu-xen'
> 
> in the VM config file.
> 
> 
> > You mean upstream QEMU is this tree git://git.qemu.org/qemu.git ? I heard
> somebody said PCI device assignment does not work for this tree, but device
> hot-add/remove works.
> 
> qemu-upstream-unstable, the upstream QEMU based tree used with Xen 4.2,
> (git://xenbits.xensource.com/qemu-upstream-unstable.git) is based on
> QEMU 1.0 and doesn't support PCI passthrough.
> 
> However upstream QEMU (git://git.qemu.org/qemu.git) does, and I am going
> to rebase on it early when the 4.3 development cycle opens.  So it is
> probably a good idea for you to try out upstram QEMU now.
> We have a wiki page on how to build and run upstream QEMU on
> xen-unstable:
> 
> http://wiki.xen.org/wiki/QEMU_Upstream

I got it, I'll work my patch for QEMU upstream.

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