Re: [PATCH 2/3] pci: acpi: Windows 'PCI Label Id' bug workaround

[Fiona Ebner <f.ebner@proxmox.com>]

Am 15.01.25 um 13:53 schrieb Igor Mammedov:
> Current versions of Windows call _DSM(func=7) regardless
> of whether it is supported or not. It leads to NICs having bogus
> 'PCI Label Id = 0', where none should be set at all.
> 
> Also presence of 'PCI Label Id' triggers another Windows bug
> on localized versions that leads to hangs. The later bug is fixed
> in latest updates for 'Windows Server' but not in consumer
> versions of Windows (and there is no plans to fix it
> as far as I'm aware).
> 
> Given it's easy, implement Microsoft suggested workaround
> (return invalid Package) so that affected Windows versions
> could boot on QEMU.
> This would effectvely remove bogus 'PCI Label Id's on NICs,
> but MS teem confirmed that flipping 'PCI Label Id' should not
> change 'Network Connection' ennumeration, so it should be safe
> for QEMU to change _DSM without any compat code.
> 
> Smoke tested with WinXP and WS2022
> Resolves: https://gitlab.com/qemu-project/qemu/-/issues/774
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>

Tested-by: Fiona Ebner <f.ebner@proxmox.com>

Fixes the VirtIO NIC issue with a German Windows 10 guest for me.