Re: What's the status of x2APIC support in Linux kernel?

Jike Song
2008-02-02T02:55:42Z

On 2/1/08, Andi Kleen <andi@firstfloor.org> wrote:

> There are right no CPUs shipping which implement x2apic.
Thanks for your information.

> "Jike Song" <albcamus@gmail.com> writes:
> > Maybe. I have a question as well, what about the status of I/O
> > xAPIC support in linux? If it is not supported yet, is there any
> > effort to add it? I'm interested in that, hopefully can take part in
> > the development.
>
> xAPIC has been supported forever.

Thank you for your attention, Andi.

Oh, what do I mean is "I/O xAPIC", but not the "local xAPIC" or xAPIC
interrupt architecture introduced by Intel Pentium4 CPU. It seems
that the "I/O xAPIC" hasn't been well documented yet, but some other
document do have some description about it. Some Intel guys gave me
an URL for the document:

http://download.intel.com/technology/computing/vptech/Intel(r)_VT_for_Direct_IO.pdf

Section 5 and section 9.5 describe 'I/OxAPIC'. I'm not sure if it is
already supported by Linux, I guess it is not.

--
Best Regards,
Jike