On Fri, Aug 07, 2015 at 01:55:17AM +0200, Laszlo Ersek wrote:
On 08/06/15 17:46, Kevin O'Connor wrote:
As an aside - if ultimately the goal is to change QEMU so that it no longer uses linuxboot,
I don't think that's the ultimate / primary goal (well, certainly not the reason why I'm interested in this work).
I wonder if it makes sense to clean up the QEMU<->firmware interface for it. It seems that linuxboot uses 12 old-style fw_cfg entries to pass the kernel. It seems that could be replaced with three new-style fw_cfg "file" entries - "/vmlinuz", "/initrd", and "/cmdline" - and QEMU could avoid having to parse and manipulate the vmlinuz contents. I'm guessing all the old-style fw_cfg entries were implemented to make the linuxboot assembler easier. That shouldn't be necessary with SeaBIOS though. Just something to think about - it shouldn't be a pre-requisite for the fw_cfg dma stuff.
Both OVMF (UEFI for x86 guests, built from edk2) and AAVMF (UEFI for ARM guests, built from edk2) depend on those old-style fw_cfg entries.
Okay, I wasn't aware of that. I agree it probably isn't worth changing.