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From: Anthony Liguori <aliguori at amazon.com> See https://issues.oasis-open.org/browse/VIRTIO-16 although it was prematurely closed. Red Hat has non-redistributable Windows drivers and Microsoft will not allow anyone else to WHQL certify drivers using that vendor ID. That makes it impossible to use virtio drivers with a Windows guest without changing the vendor ID. Cc: Matt Wilson

From: Anthony Liguori <aliguori at amazon.com> See https://issues.oasis-open.org/browse/VIRTIO-16 although it was prematurely closed. Red Hat has non-redistributable Windows drivers and Microsoft will not allow anyone else to WHQL certify drivers using that vendor ID. That makes it impossible to use virtio drivers with a Windows guest without changing the vendor ID. Cc: Matt Wilson

...o WHQL. On the host side, you will need a QEMU patch to allow libvirt control of the subsystem vendor ID. All this while all Linux guests will keep working without changes, which seems like a better approach. Looking on the web, I found: http://download.microsoft.com/download/1/6/1/161ba512-40e2-4cc9-843a-923143f3456c/pciidspec-11.doc "Test will read and properly concatenate PCI IDs and verify uniqueness" this is likely what you are running into: IDs must be unique, so if you want to put your driver in Microsoft's database, it must match a different set of IDs. But you should not...

...ll need a QEMU patch to allow libvirt control of > the subsystem vendor ID. > > All this while all Linux guests will keep working without changes, > which seems like a better approach. > > Looking on the web, I found: > http://download.microsoft.com/download/1/6/1/161ba512-40e2-4cc9-843a-923143f3456c/pciidspec-11.doc > "Test will read and properly concatenate PCI IDs and verify uniqueness" > this is likely what you are running into: IDs must be unique, > so if you want to put your driver in Microsoft's database, > it must match a different set of IDs....

...ll need a QEMU patch to allow libvirt control of > the subsystem vendor ID. > > All this while all Linux guests will keep working without changes, > which seems like a better approach. > > Looking on the web, I found: > http://download.microsoft.com/download/1/6/1/161ba512-40e2-4cc9-843a-923143f3456c/pciidspec-11.doc > "Test will read and properly concatenate PCI IDs and verify uniqueness" > this is likely what you are running into: IDs must be unique, > so if you want to put your driver in Microsoft's database, > it must match a different set of IDs....

...rt control of > > the subsystem vendor ID. > > > > All this while all Linux guests will keep working without changes, > > which seems like a better approach. > > > > Looking on the web, I found: > > http://download.microsoft.com/download/1/6/1/161ba512-40e2-4cc9-843a-923143f3456c/pciidspec-11.doc > > "Test will read and properly concatenate PCI IDs and verify uniqueness" > > this is likely what you are running into: IDs must be unique, > > so if you want to put your driver in Microsoft's database, > > it must match a d...