Messages in this thread | | | Date | Mon, 29 Jul 2013 13:05:14 -0400 | From | Youquan Song <> | Subject | Re: [PATCH] x86, apic: Enable x2APIC physical when cpu < 256 native |
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> Yes. It would be great, if Youquan can point out where is the intel doc > about the change. > > Also if the patch can move on, hypervisor_x2apic_available() related > declaration and define > could be dropped.
Hi Yinghai,
Sorry I do not know the document change but I also do not find the words/description/explanation that x2APIC physical mode also need interrupt remapping support when CPU < 256. Of course, X2APIC cluster mode must has interrupt remapping support.
I have tested many machines, both old and most recent machines and from desktop to server, x2APIC physical mode works without interrupt remapping when CPU < 256.
In theory and real test, I do not find any issue about the patch.
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.
Thanks -Youquan
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