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From: Gerd Hoffmann <kraxel@redhat.com>
Date: Tue, 12 Jan 2016 11:24:55 +0100
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Subject: Re: [Qemu-devel] [Xen-devel] [PATCH v4] igd-passthrough-i440FX:
 convert to realize()
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To: "Hao, Xudong" <xudong.hao@intel.com>
Cc: Lars Kurth <lars.kurth@citrix.com>, "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Lars Kurth <lars.kurth.xen@gmail.com>, "Michael S. Tsirkin" <mst@redhat.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, Cao jin <caoj.fnst@cn.fujitsu.com>, Stefano Stabellini <Stefano.Stabellini@citrix.com>

On Di, 2016-01-12 at 09:50 +0000, Hao, Xudong wrote:
> With latest qemu 7b8a354d4716, RHEL7.2 (with default kernel) VM still can=
't boot up with IGD.

There is another bug, using pci_default_write_config() doesn't fly as
this checks writes against wmask and the registers in question are not
whitelisted ...

I've just rebased my igd patch series which (among other stuff) fixes
that bug:
  https://www.kraxel.org/cgit/qemu/log/?h=3Dwork/igd
  git://git.kraxel.org/qemu work/igd

Can you give it a spin?

Also: what does "can't boot up" mean exactly?  Guest doesn't boot at
all?  Guest boots, but igd/console/Xorg doesn't work?  In case of the
latter:  Any chance to login via network and get a kernel log?

thanks,
  Gerd