[edk2-devel][PATCH v1 1/1] ArmVirtPkg: ArmVirtQemu: Add Graphics and Input

[Leif Lindholm]

On 2023-08-19 23:10, Pedro Falcato wrote:
>> W dniu 18.08.2023 o 20:17, Oliver Smith-Denny pisze:
>>> Currently, unlike OVMF, ArmVirtQemu does not display any graphics, only
>>> the QEMU monitor. Graphics are helpful to confirm booting into an OS is
>>> successful, interacting with the EFI shell while getting separate
>>> logging messages, etc.
>>
>> Ah, that "but on x86 it is different" again ;D
>>
>> I asked QEMU (and libvirt) devs in past why AArch64/virt lacks USB while
>> both x86/pc and x86/q35 have it. The answer was something like "it was a
>> mistake we do not plan to repeat". And hint that whatever uses either
>> QEMU or libvirt should take care of adding hardware they expect.
> 
> I don't think x86 having USB was a mistake. PIIX4 (the "pc" machine)
> already had USB 1.0, Q35 (ICH9) had USB 2.0 too. Not emulating those
> automatically would be a mistake from the faithfulness PoV. If they
> wanted to have a bare board, the option of just adding a virt board
> variant with the bare minimum (PCIe and ACPI, like arm64 and riscv64
> do) is a fine idea.
> 
> (the same thing applies to other x86-but-not-the-others things like
> VGA, etc. worse for VGA, it's more or less required to be there for a
> PC-compatible board).

Yes. The problem is that this attitude results in non-trivial cognitive 
load for enabling existing workflows on !x86 platforms, making it harder 
to get random projects out there to verify things properly on them.

/
     Leif



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