Re: [Xen-devel] Re: [PATCH][RFC] gfx_passthru: warning when vgabios rom has invalid checksum

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Weidong Han writes ("Re: [Xen-devel] Re: [PATCH][RFC] gfx_passthru: warning 
when vgabios rom has invalid checksum"):
> Now I understand. Because your Q35 works with recalculated checksum, I 
> prefer to only add a warning message, and continue to load rom for gfx 
> passthru.

Having read this thread I'm still a bit confused.  The problem is that
the VGA BIOS on the graphics card is broken and has a broken checksum,
and the proposed workaround is to recalculate the checksum for the
benefit of the guest ?

Does this incorrectly checksummed BIOS work natively (ie without
passthrough) and if so why is passthrough different ?  Alternatively
if it doesn't work native why are we trying to make it work with
passthrough ?

On another level, Weidong, are you suggesting you'd like to see Noboru
produce a different patch which just produces a warning ?

Thanks,
Ian.

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