> -----Original Message----- > From: Gerd Hoffmann [mailto:kra...@redhat.com] > Sent: Thursday, May 22, 2014 2:45 PM > To: Chen, Tiejun > Cc: Anthony PERARD; Daniel P. Berrange; peter.mayd...@linaro.org; > xen-de...@lists.xensource.com; m...@redhat.com; > stefano.stabell...@eu.citrix.com; Kay, Allen M; kelly.zyta...@amd.com; > qemu-devel@nongnu.org; Zhang, Yang Z; anth...@codemonkey.ws > Subject: Re: [Qemu-devel] [v2][PATCH 4/8] xen, gfx passthrough: reserve > 00:02.0 for INTEL IGD > > Hi, > > > > Another useful thing would be to not create the xen platform device > > > in case "-nodefaults" was specified on the command line (that switch > > > turns off a bunch of other devices present by default: vga, nic, cdrom, > > > ...). > > > > Currently looks 'xen-platform' itself can't be created, not those devices > existed on that. > > The error message looks more like libxl tries to hot-unplug the xen platform > device. > > Attached patch (untested!) hooks up the xen platform device to the default > device code we have in qemu. Two effects: > > (1) As mentioned above the device will not be created in case > -nodefaults is specified on the command line.
I think this is unnecessary to add this option to support GFX passthrough. > (2) Autocreating the device is also turned off in case xen-platform > is added manually via -device. > > With the patch applied you should be able to move the xen-platform device to > some other place with a simple 'qemu -device xen-platform,addr=$slot'. > Yes, this patch works now. So I assume this would be merged into ML soon. Thanks for your great help, Gerd! Tiejun
