On 03/25/2013 09:03 PM, Hu Tao wrote: > Signed-off-by: Hu Tao <hu...@cn.fujitsu.com> > --- > docs/specs/pvpanic.txt | 35 +++++++++++++++++++++++++++++++++++ > 1 file changed, 35 insertions(+) > create mode 100644 docs/specs/pvpanic.txt
> +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 s/written/write/ Also, mention that the remaining bits are reserved, and should be written as 0, and ignored on read (that way, the spec can be updated when we define a later bit, and older hosts won't be trying to set or act on bits they don't understand). > +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. Again, documenting that the remaining bits are reserved (write 0, ignore on read) is a wise addition. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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