* Youquan Song <youquan.s...@linux.intel.com> wrote:
> > In order to make sure the patch without involving unexpected issues beyond
> > I can understand, I will confirm with our expert about it.
> >
> > so please pend the patch going to mainline. If the patch can move on, I
> > think I will also provide other patch changing, like direct EOI.
>
> Hi Yinghai and Ingo,
>
> I have confirmed with our experts about it. x2APIC without interrupt
> remapping is not architecture and no guarantee it will work in future.
>
> What's more, there are some words in SDM3,
> 10.12.7 Initialization by System
> Software Routing of device interrupts to local APIC units operating in
> x2APIC mode requires use of the interrupt-remapping architecture
> specified in the Intel Virtualization Technology for Directed I/O,
> Revision 1.3. Because of this, BIOS must enumerate support for and
> software must enable this interrupt remapping with Extended Interrupt
> Mode Enabled before it enabling x2APIC mode in the local APIC units.
>
> Ingo, please drop the patch in -tip tree.
> 3d1acb49d22fbbae96524040e9e2d4cbbb3adbef "x86/apic: Enable x2APIC
> physical mode on native hardware too, when there are fewer than 256
> CPUs"
Ok, dropped it - it was still the tail commit.
> Sorry for making fuss here and it is my fault.
No problem - you might want to send another patch adding some comments to
the code, explaining why we don't switch to physical mode, quoting from
the SDM and so.
Thanks,
Ingo
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