On 07/24/2012 07:55 AM, Rusty Russell wrote:

On Mon, 23 Jul 2012 22:32:39 +0200, Sasha Levin [off-list ref] wrote:

quoted

As it was discussed recently, there's currently no way for the guest to notify
the host about panics. Further more, there's no reasonable way to notify the
host of other critical events such as an OOM kill.

I clearly missed the discussion.  Is this actually useful?  In practice,

Admit this is not a killer feature..

won't you want the log from the guest?  What makes a virtual guest
different from a physical guest?

Most times virt guest can do better than a physical OS. In that sense, 
this is where virtualization shines (live migration, hotplug for any 
virtual resource including net/block/cpu/memory/..).

There are plenty of niche but worth while small features such as the 
virtio-trace series and other that allow the host/virt-mgmt to get more 
insight into the guest w/o a need to configure the guest.

In theory guest OOM can trigger a host memory hot plug action. Again, I 
don't see it as a key feature..

Guest watchdog functionality might be useful, but that's simpler to

There is already a fully emulated watchdog device in qemu.
Cheers,
Dor

implement via a virtio watchdog device, and more effective to implement
via a host facility that actually pings guest functionality (rather than
the kernel).

Cheers,
Rusty.
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