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

["Pedro Falcato" <pedro.falcato@gmail.com>]

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?

-- 
Pedro


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