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Re: [Xen-devel] [v5][PATCH 0/5] xen: add Intel IGD passthrough support

On 06/30/2014 03:22 PM, Stefano Stabellini wrote:
On Mon, 30 Jun 2014, Michael S. Tsirkin wrote:
On Mon, Jun 30, 2014 at 03:24:58PM +0800, Chen, Tiejun wrote:
On 2014/6/30 14:48, Michael S. Tsirkin wrote:
On Mon, Jun 30, 2014 at 10:51:49AM +0800, Chen, Tiejun wrote:
On 2014/6/26 18:03, Paolo Bonzini wrote:
Il 26/06/2014 11:18, Chen, Tiejun ha scritto:

- offsets 0x0000..0x0fff map to configuration space of the host MCH

Are you saying the config space in the video device?

No, I am saying in a new BAR, or at some magic offset of an existing

As I mentioned previously, the IGD guy told me we have no any unused a
offset or BAR in the config space.

And guy who are responsible for the native driver seems not be accept to
extend some magic offset of an existing MMIO BAR.

In addition I think in a short time its not possible to migrate i440fx to
q35 as a PCIe machine of xen.

That seems like a weak motivation.  I don't see a need to get something
merged upstream in a short time: this seems sure to miss 2.1,
so you have the time to make it architecturally sound.
"Making existing guests work" would be a better motivation.


So focus on this then. Existing guests will probably work
fine on a newer chipset - likely better than on i440fx.
xen management tools need to do some work to support this?

Unfortunately existing Windows guests don't take well chipset changes.
Windows might request a new activation.

That is a very good point. A while back I did a bunch of work to try to keep Windows activated between running an instance of Windows on bare metal and as a VM. There were numerous bits of hardware and firmware that went into the calculation as to whether Windows thought it was the same platform for activation purposes. Changing the chipset sounds like a likely candidate for inspection. Somewhere out there on the webs is a partial list of the things that are inspected - lost the URL.

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