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Re: [vfio-users] Some questions regarding VGA Arbitration, BIOS and UEFI Boot



On Tue, Mar 22, 2016 at 1:43 AM, Zir Blazer <zir_blazer hotmail com> wrote:

I expect to get AW to reply this time, heh. Seriously, I can't make wall of texts smaller than this since i always try to explain context and my thoughs.

Not into the whole brevity thing huh?  I found this one challenging to get through as well.

1) The host using UEFI or legacy BIOS and VGA support is irrelevant.  In an ideal world, maybe this wouldn't be the case, but Xorg wants exclusive access to VGA even though it probably doesn't use it.  Find someone to go fix Xorg.

2) Yes, you should probably try secondary graphics passthrough, this typically works for AMD cards and would probably allow you to avoid the whole VGA issue.

3) IGD issues are numerous; dependencies not only on the PCI address of the device in the guest, but also stolen memory configuration, OpRegion access, vBIOS fixups, LPC bridge presence and IDs, and host bridge identification.  Go read the upstream development threads or maybe I'll write a blog post about it some day.

4) romfile= doesn't care about the size of the physical option ROM space on the device.  I've never tried to mod a ROM for UEFI support, in fact, why bother, are you somehow attached to this 5770?  For an investment of $100USD a GTX750 handily beats it, includes UEFI support, and uses less power.  How much is your time worth?

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