Re: [libvirt] [PATCH] vl: allow "cont" from panicked state
Il 22/08/2013 10:38, Laszlo Ersek ha scritto:
> > To support 1.5, libvirt should simply be ready to react to
unanticipated
> > GUEST_PANICKED events. reboot-on-panic will simply be broken for 1.5
> > and Linux 3.10+ guests. :(
I'm probably misunderstanding the discussion, but it might be possible
to disable pvpanic even in 1.5 from the host side, with the following hack:
-global pvpanic.ioport=0
In qemu, this will either configure a working pvpanic device on ioport
0, or the pvpanic device will be genuinely broken. At least it doesn't
(obviously) break other stuff (in v1.5.2):
(qemu) info mtree
I/O
0000000000000000-000000000000ffff (prio 0, RW): io
0000000000000000-0000000000000000 (prio 0, RW): pvpanic
0000000000000000-0000000000000007 (prio 0, RW): dma-chan
No, you're not misunderstanding the discussion.
Depending on the priorities of the pvpanic and legacy-DMA regions, it
would break DMA channel 0. Channel 0 is (was) used for DRAM refresh, so
it should not have any visible effect. However, it may not be entirely
disabling pvpanic, just making it mostly invisible.
Paolo