Roman Kagan e211288b72 x86/hyperv: Make vapic support x2apic mode ... Now that there's Hyper-V IOMMU driver, Linux can switch to x2apic mode when supported by the vcpus. However, the apic access functions for Hyper-V enlightened apic assume xapic mode only. As a result, Linux fails to bring up secondary cpus when run as a guest in QEMU/KVM with both hv_apic and x2apic enabled. According to Michael Kelley, when in x2apic mode, the Hyper-V synthetic apic MSRs behave exactly the same as the corresponding architectural x2apic MSRs, so there's no need to override the apic accessors. The only exception is hv_apic_eoi_write, which benefits from lazy EOI when available; however, its implementation works for both xapic and x2apic modes. Fixes: 29217a4746 ("iommu/hyper-v: Add Hyper-V stub IOMMU driver") Fixes: 6b48cb5f83 ("X86/Hyper-V: Enlighten APIC access") Suggested-by: Michael Kelley <mikelley@microsoft.com> Signed-off-by: Roman Kagan <rkagan@virtuozzo.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com> Reviewed-by: Michael Kelley <mikelley@microsoft.com> Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/20191010123258.16919-1-rkagan@virtuozzo.com		2019-10-15 10:57:09 +02:00
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hv_apic.c	x86/hyperv: Make vapic support x2apic mode	2019-10-15 10:57:09 +02:00
hv_init.c	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2019-09-17 12:35:15 -07:00
hv_spinlock.c	x86/hyperv: Make hv_vcpu_is_preempted() visible	2019-04-19 17:58:57 +02:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
mmu.c	x86/hyper-v: Fix overflow bug in fill_gva_list()	2019-09-02 19:57:19 +02:00
nested.c	x86/hyper-v: Add HvFlushGuestAddressList hypercall support	2018-12-21 11:28:39 +01:00