On 06/09/22 16:03, Kevin Locke wrote:
> On Thu, 2022-06-09 at 09:45 +0200, Laszlo Ersek wrote:
>> (2) Assigned PCI Express GPUs that offer legacy VGA compatibility,
>> and that such compatibility is expected of (due to booting with
>> SeaBIOS, or due to UEFI driver bugs or nati
Thanks Laszlo, I really appreciate the detailed explanation and
feedback!
On Thu, 2022-06-09 at 09:45 +0200, Laszlo Ersek wrote:
> (a) your original (non-functional) use case:
>
> qemu-system-x86_64 \
> -no-user-config \
> -nodefaults \
> -machine q35,accel=kvm \
> -m 1G \
> -
Hi,
> I find this too general; a PCI Express device is supposed to work
> without IO resources. Graphics cards with legacy VGA compatibility are
> the exception AIUI (see again Alex's blog about VGA arbitration), so we
> should spell that out.
Yes, it's an exception specifically for VGA ports.
On 06/09/22 09:45, Laszlo Ersek wrote:
> +Alex
>
> On 06/09/22 04:00, Kevin Locke wrote:
> *In theory*, scenario (b) applies to "bochs-display" and
> "virtio-gpu-pci" when you plug them into a legacy PCI slot:
>
>> Plugging a PCI Express device into a PCI slot will hide the Extended
>> Configura
+Alex
On 06/09/22 04:00, Kevin Locke wrote:
> ioport access is required for VESA BIOS Extensions (VBE). Since ioport
> access is not forwarded over PCI(e) bridges, graphics adapters must be
> attached directly to the Root Complex in order for the BIOS to provide
> VBE modes. I'm very grateful to
ioport access is required for VESA BIOS Extensions (VBE). Since ioport
access is not forwarded over PCI(e) bridges, graphics adapters must be
attached directly to the Root Complex in order for the BIOS to provide
VBE modes. I'm very grateful to Gerd Hoffmann for explaining this on
the SeaBIOS mai
