I remember trying that before I ended up switching my guest GPU to
secondary, and I'd get the exact same symptoms (no input on the guest
monitor, everything still boots normally) except without any kind of
error message this time around. Are you recommanding to simply avoid
booting off the boot VGA device altogether?
On 2016-05-20 16:27, Alex Williamson wrote:
The boot VGA ROM is handled differently from other PCI ROMs in Linux,
when you read it you're actually reading a shadow copy of it placed at
0xc0000, which has its roots back in the original IBM PC history.
Execution of the VGA ROM is allowed to modify this copy of the ROM
image in memory. Thus you're really not getting a pristine copy of
the device ROM and it can often lead to these invalid ROM contents
messages. I wish we provided raw access to the PCI option ROM in
these cases as well. For now, if you do have these sorts of invalid
ROM messages, I would suggest that you at least boot with the card as
secondary, dump the ROM, then use that collected image with the
romfile= option rather than use the shadow copy. I had to add some
code to vfio to fix device IDs and checksums for IGD assignment
because of this, I don't know if there's any standard fixup we can do
for other vendors. Thanks,
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