Xen devel - Apr 2008 - [PATCH] Enable the x2APIC enhancement to Xen

On platforms which supports x2APIC, the patches enable this enhancement
for Xen.

The x2APIC specification is available at
http://www.intel.com/products/processor/manuals/
http://download.intel.com/design/processor/specupdt/318148.pdf

apicid_u8_2_u32.patch: changes the ''apicid'' from u8 to u32;
x2apic.patch: replaces the traditional MMIO-style interface to the
MSR-style one; uses physical fixed mode to deliver interrupts to CPU0.

Signed-off-by: Dexuan Cui <dexuan.cui@intel.com>



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Cui, Dexuan wrote:
> x2apic.patch: replaces the traditional MMIO-style interface to the
> MSR-style one; uses physical fixed mode to deliver interrupts to CPU0.
Sorry, I mean "in I/O APIC''s RTEs, deliver interrupts to
CPU0"...

-- Dexuan

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What benefits does this patch bring us?

 -- Keir

On 28/4/08 11:02, "Cui, Dexuan" <dexuan.cui@intel.com> wrote:
> On platforms which supports x2APIC, the patches enable this enhancement
> for Xen.
> 
> The x2APIC specification is available at
> http://www.intel.com/products/processor/manuals/
> http://download.intel.com/design/processor/specupdt/318148.pdf
> 
> apicid_u8_2_u32.patch: changes the ''apicid'' from u8 to
u32;
> x2apic.patch: replaces the traditional MMIO-style interface to the
> MSR-style one; uses physical fixed mode to deliver interrupts to CPU0.
> 
> Signed-off-by: Dexuan Cui <dexuan.cui@intel.com>


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