RE: [Xen-devel] [PATCH 1 of 3] apic: record local apic state on boot

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Konrad Rzeszutek Wilk
> Sent: Thursday, May 19, 2011 4:43 AM
> 
> On Wed, May 18, 2011 at 09:27:56PM +0100, Andrew Cooper wrote:
> >
> >
> > On 18/05/11 19:49, Konrad Rzeszutek Wilk wrote:
> > >On Wed, May 18, 2011 at 07:08:14PM +0100, Andrew Cooper wrote:
> > >>Xen does not store the boot local apic state which leads to problems
> > >>when shutting down for a kexec jump.  This patch records the boot
> > >>state so we can return to the boot state when kexec'ing.
> > >>
> > >>This is per CPU because all 3 bioses on the boxes I have tested dont
> > >>enabled all local apics on boot.  As a result, we have to return to
> > >>the bios state so the ACPI tables match up with the hardware state
> > >>for the booting kernel.
> > >Which ACPI table requires this?
> > Cant remember offhand but linux (2.6.32) was doing finger pointing at
> > the multi-processor tables
> 
> MP tables? Those don't get used when ACPI is used..

He may mean ACPI MADT table...

Thanks
Kevin

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