Re: [Qemu-devel] [PATCH v11] kvm: notify host when the guest is panicked

[Sasha Levin]

On Mon, Nov 5, 2012 at 8:58 PM, Hu Tao <address@hidden> wrote:
> But in the case of panic notification, more dependency means more
> chances of failure of panic notification. Say, if we use a virtio device
> to do panic notification, then we will fail if: virtio itself has
> problems, virtio for some reason can't be deployed(neither built-in or
> as a module), or guest doesn't support virtio, etc.

Add polling to your virtio device. If it didn't notify of a panic but
taking more than 20 sec to answer your poll request you can assume
it's dead.

Actually, just use virtio-serial and something in userspace on the guest.

> We choose IO because compared to virtio device, it is not that heavy and
> less problematic.

Less problematic? Heavy? Are there any known issues with virtio that
should be fixed? You make virtio sound like an old IDE drive or
something.


Thanks,
Sasha