Re: [Qemu-devel] [PATCH v15.1 4/6] pvpanic: add document of pvpanic

[Paolo Bonzini]

Il 26/03/2013 04:03, Hu Tao ha scritto:
> Signed-off-by: Hu Tao <address@hidden>
> ---
>  docs/specs/pvpanic.txt | 35 +++++++++++++++++++++++++++++++++++
>  1 file changed, 35 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..1f14063
> --- /dev/null
> +++ b/docs/specs/pvpanic.txt
> @@ -0,0 +1,35 @@
> +PVPANIC DEVICE
> +==============
> +
> +pvpanic device is a simulated ISA device, through which a 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.
> +
> +The management app has the option of waiting for GUEST_PANICKED events,
> +and/or polling for guest-panicked RunState, to learn when the pvpanic
> +device has fired a panic event.
> +
> +ISA Interface
> +-------------
> +
> +pvpanic uses port 0x505 to receive a panic event from the guest. On
> +written, bit 0 is set to indicate guest panic has happened. On read, bit
> +0 is set to indicate guest panic notification is supported.
> +
> +ACPI Interface
> +--------------
> +
> +pvpanic device is defined with ACPI ID "QEMU0001". Custom methods:
> +
> +RDPT:       To determine whether guest panic notification is supported.
> +Rrguments:  None
> +Return:     Returns a byte, bit 0 set to indicate guest panic
> +            notification is supported.
> +
> +WRPT:       To send a guest panic event
> +Arguments:  Arg0 is a byte, with bit 0 set to indicate guest panic has
> +            happened.
> +Return:     None
> +
> +The ACPI device will automatically refer to the right port in case it
> +is modified.
> 

Looks good.

Paolo