Re: [Qemu-devel] [PATCH v15 4/6] pvpanic: add document of pvpanic

[Hu Tao]

On Thu, Mar 21, 2013 at 10:13:50AM +0100, Paolo Bonzini wrote:
> Il 21/03/2013 09:35, Hu Tao ha scritto:
> > Signed-off-by: Hu Tao <address@hidden>
> > ---
> >  docs/specs/pvpanic.txt | 25 +++++++++++++++++++++++++
> >  1 file changed, 25 insertions(+)
> >  create mode 100644 docs/specs/pvpanic.txt
> > 
> > diff --git a/docs/specs/pvpanic.txt b/docs/specs/pvpanic.txt
> > new file mode 100644
> > index 0000000..761d20c
> > --- /dev/null
> > +++ b/docs/specs/pvpanic.txt
> > @@ -0,0 +1,25 @@
> > +PVPANIC DEVICE
> > +==============
> > +
> > +pvpanic device is a simulated ISA device, through which guest panic
> > +event is sent to qemu, and a QMP event is generated. This allows
> > +management apps(e.g. libvirt) to be notified and respond to the
> > +event.
> > +
> > +pvpanic uses port 0x505 by default to receive panic event from guest.
> > +The port is configurable by specifying ioport property.
> 
> Please document the ISA interface too.
> 
> > +pvpanic device is defined with ACPI ID "QEMU0001". To send panic
> > +event, guest evaluates method WRPT, specifying a byte, bit 0 set,
> > +as argument. Other bits are reserved.
> 
> Please document RDPT too, and mention that the ACPI device will
> automatically refer to the right port in case it is modified.
> 
> > +To use it, one will have to:
> > +
> > +1. add the device by specifying `-device pvpanic' in the qemu command
> > +   line.
> 
> As mentioned earlier, I'd like this to be the default in 1.5 and newer
> machine types.

I must have missed it. Thanks for review!

> 
> Paolo
> 
> > +2. load pvpanic device driver in guest OS.
> > +
> > +The management app has the options of waiting for GUEST_PANICKED events,
> > +and/or polling for guest-panicked RunState, to learn when the pvpanic
> > +device has fired a panic event.
> >