RE: [Xen-devel] [PATCH] Fix hvm vcpu hotplug bug

["Liu, Jinsong" <jinsong.liu@xxxxxxxxx>]

Ian Jackson wrote:
> Liu, Jinsong writes ("RE: [Xen-devel] [PATCH] Fix hvm vcpu hotplug
> bug"): 
>> ospm will do. Its sequence is (i.e. linux 2.6.32, ospm dispatch
>> control method case)
> 
> "ospm" is "OS power management" ie in our case the guest kernel I take
> it ?

hmm, 'ospm' is just a generial speaking, more accurate speaking is 'acpica'.
i.e. hvm linux 2.6.32 handle sci/gpe at:
drivers/acpi/acpica/evsci.c
drivers/acpi/acpica/evgpe.c

> 
>> 1). clear pge_en x by writing '0' to the bit;
>> 2). asynchronic call control method;
>> 3). clear gpe_sts x by writing '1' to the bit;
>> 4). re-enable gpe_en x by writing '1' to the bit;
> 
> So the code in qemu should never clear gpe_sts itself.
> 
> Ian.

No, that's just what qemu should do, to simulate hardware behavior.

Thanks,
Jinsong


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