[vfio-users] when is ROM extraction needed and how to do it correctly?

[Nick Sarnie]

I believe it's only needed to check if your video card bios supports UEFI
with rom-parser. You can optionally pass it to qemu, but I haven't needed
to.

On Fri, Feb 26, 2016 at 3:54 AM, Daniel Pocock <daniel at pocock.pro> wrote:

>
> In which cases are these ROMs actually needed? For example, is the ROM
> needed if the passthrough video device is secondary display? Is the ROM
> needed if using UEFI / OVMF instead of SeaBIOS?
>
> I've extracted ROMs from each GPU using the method:
>
>   find /sys/devices -name rom
>
> to discover the devices with a ROM.  For the device I want to use, I've
> used something like the following to extract the ROM (based on the paths
> found by the find command):
>
>
> ROM=/sys/devices/pci0000\:40/0000\:40\:03.0/0000\:42\:00.0/rom
>
> echo 1 | tee "${ROM}"
> cat "${ROM}" > my-vga-device.rom
>
> I've also read that some devices modify a copy of their ROM data during
> boot.  Does the method described above access the original ROM content
> or the modified content?  If it is accessing modified content, is there
> a way to get the original ROM content, either generically or in a method
> specific to each vendor?
>
>
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