Re: [PATCH 0/2 v3] kvm: notify host when guest panicked

[Avi Kivity <avi@redhat.com>]

On 03/14/2012 03:07 PM, Avi Kivity wrote:
> On 03/14/2012 01:11 PM, Wen Congyang wrote:
> > > 
> > > I don't think we want to use the driver.  Instead, have a small piece of
> > > code that resets the device and pushes out a string (the panic message?)
> > > without any interrupts etc.
> > > 
> > > It's still going to be less reliable than a hypercall, I agree.
> >
> > Do you still want to use complicated and less reliable way?
>
> Are you willing to try it out and see how complicated it really is?
>
> While it's more complicated, it's also more flexible.  You can
> communicate the panic message, whether the guest is attempting a kdump
> and its own recovery or whether it wants the host to do it, etc., you
> can communicate less severe failures like oopses.

Note, this is similar to how network drivers have a special path (no
interrupts) for netconsole output, this is used during panic as well.

-- 
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