Re: [edk2-devel] [PATCH 1/1] OvmfPkg/QemuVideoDxe: purge VbeShim

["Laszlo Ersek" <lersek@redhat.com>]

On 2/13/24 16:47, Pedro Falcato wrote:
> On Tue, Feb 13, 2024 at 3:28 PM Gerd Hoffmann <kraxel@redhat.com> wrote:
>>
>>   Hi,
>>
>>>>> New theory: This is a NULL pointer dereference corrupting the zero page.
>>>>
>>>> Tangentially related: Maybe it's time to unmap the NULL page? :)
>>
>> Suggestion: read mails to the end.  Had the same idea + question ;)
> 
> Sorry! My bad. Apparently I don't know how to read ;)
> 
>>
>>> That would break many 3rd party GPU and network drivers.
>>
>> For virtual machine firmware it might be acceptable to just ignore
>> that, or at least default to an unmapped zero page and offer an
>> qemu fw-cfg override in case someone needs that when pci-assigning
>> nic or gpu to a VM.
> 
> IMO this is a really nice suggestion. Could QEMU be modified to inject
> the fwcfg option if a VFIO device is present or something? Would that
> solve most of the compatibility issues? Are OVMF and QEMU usually
> packaged (distro-side) in somewhat of a lockstep?
> 

Trying to integrate this closely with QEMU looks like a recipe for
derailment, if past experience is to be listened to...

Laszlo



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