Re: [PATCH] Set bit 1 in disabled processor's _STA

Gleb Natapov
2009-05-18T12:42:12Z

On Mon, May 18, 2009 at 09:40:03AM -0300, Glauber Costa wrote:
> On Mon, May 18, 2009 at 02:40:18PM +0300, Gleb Natapov wrote:
> > On Mon, May 18, 2009 at 08:39:43AM -0300, Glauber Costa wrote:
> > > > Now I recall something on LKML about this. Well, in this case Linux
> > > > shouldn't have used ACPI to invent its own way to do cpu hot-plug.
> > > It didn't.
> > > History shows that this method is what is used in some unisys machines,
> > > which seems to be the only ones implementing this around.
> > The questions are: What is "this" that linux currently implements, how
> > windows expects CPU hot-plug to work, are there any real x86 hardware
> > that supports CPU host-plug and what should we do about all this.
> as I said, there are unisys machines that implements cpu hotplug.
> The way they do it, is the way Linux kernel currently expects. The same way
> we implement on our BIOS.
I read that document too. And "based on some input from Natalie of Unisys"
does not sound promising. Are those Unisys machines certified to run
Windows 2008? Because if they are, they surely do something different
from what we are doing.

--
Gleb.