> 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" Sorry for making fuss here and it is my fault. Thanks -Youquan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
