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

Il 30/06/2014 12:20, Chen, Tiejun ha scritto:

I already post this to mainline to change as follows:

-    while ((pch = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, pch))) {
+    pch = pci_get_bus_and_slot(0, PCI_DEVFN(0x1f, 0));
+    if (pch) {

Please refer to this,

[RFC][PATCH] gpu:drm:i915:intel_detect_pch: back to check devfn instead
of check class type

Linux Native guys would like to accept this. And actually Windows always
use devfn to detect this.

Fair enough, but that means that, when using IGD, Q35 will have to move the ISA bridge off 1f.0.

To me it seems fairly clear that as things stand IGD is not virtualizable without PV support. We're beating a dead horse.


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