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

Il 25/06/2014 11:21, Chen, Tiejun ha scritto:
Adding a vendor-specific capability or BAR
in an existing device is painful - hard to find
free space for it.

Yes, this is a potential risk as well since we can't guarantee current
free space is always valid for ever.

For past devices, we know which BARs they use. For future devices, it would be nice if the PCH/MCH backdoor was specified so that we know they will leave a free BAR for virtualization.


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