Re: [libvirt] [PATCH 0/4] allow OVMF users to disable qemu's "-boot strict=on"

On 01/22/14 11:45, Daniel P. Berrange wrote: > On Wed, Jan 22, 2014 at 01:33:18AM +0100, Laszlo Ersek wrote: >> Recently, >> >> commit 96fddee322c7d39a57cfdc5e7be71326d597d30a >> Author: Laine Stump <laine(a)laine.org&gt; >> Date: Mon Dec 2 14:07:12 2013 +0200 >> >> qemu: add "-boot strict" to commandline whenever possible >> >> introduced a regression for OVMF guests. The symptoms and causes are >> described in patch 3/4, and in >> >> https://bugzilla.redhat.com/show_bug.cgi?id=1056258 >> >> Let's allow users to opt-out of "-boot strict=on" while preserving it as >> default. > > I don't really get from that bug description why this can't be > made to work as desired in OVMF. It seems like its is just a > bug in the OVMF impl that it doesn't work. Have you read the description in patch 3 too? The basic idea of HALT is that you specify everything in the fw_cfg file that you want to boot from, and expect that the firmware attempt no other option to boot. This assumes that you are able to *express* all places that you want to boot from in the fw_cfg boot specification. Under UEFI there are places to boot from that you simply cannot express in fw_cfg. If you specify HALT, then you'll never reach those places, not even as fallbacks. And users do want to reach those places as fallbacks.