[SeaBIOS] about [SeaBIOS PATCH] Try to hard-reboot on rerun of post even on emulators.
akong at redhat.com
Tue Apr 21 01:31:36 CEST 2015
When I use old seabios in some stable linux release, some bootable
devices (2 ide disks) would be lost when I try to restart guest by
Ctrl+Alt+Delete during boot stage.
Releated Red Hat BZ: https://bugzilla.redhat.com/show_bug.cgi?id=1129549
I found an upstream commit  fixed this bug, but when I backport
this patch to old seabios, guest will shutdown when I try to restart
by Ctrl+Alt+Delete during boot stage.
Kevin, can you help to describe that:
"Unfortunately, kvm does not keep a pristine copy of the BIOS at 0xffff0000"
It's a kvm (userspace, QEMU) bug?
If it's a qemu-kvm bug, I should also fix this bz in old stable release.
Author: Kevin O'Connor <kevin at koconnor.net>
Date: Wed Sep 15 21:48:16 2010 -0400
Try to hard-reboot on rerun of post even on emulators.
Extend the hard-reboot logic to qemu and kvm. On qemu, a reboot will
not reset the memory settings for 0xc0000-0xfffff, so copy that memory
area manually before rebooting. Unfortunately, kvm does not keep a
pristine copy of the BIOS at 0xffff0000, so detect that case and
shutdown the machine.
Two backport dependences:
[PATCH] Try to hard-reboot processor on rerun of post under coreboot.
[PATCH] Don't do shadow copying of optionroms when CONFIG_OPTIONROMS_DEPLOYED.
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