Punit Agrawal 86658b819c KVM: arm/arm64: Skip updating PMD entry if no change ... Contention on updating a PMD entry by a large number of vcpus can lead to duplicate work when handling stage 2 page faults. As the page table update follows the break-before-make requirement of the architecture, it can lead to repeated refaults due to clearing the entry and flushing the tlbs. This problem is more likely when - * there are large number of vcpus * the mapping is large block mapping such as when using PMD hugepages (512MB) with 64k pages. Fix this by skipping the page table update if there is no change in the entry being updated. Cc: stable@vger.kernel.org Fixes: ad361f093c ("KVM: ARM: Support hugetlbfs backed huge pages") Reviewed-by: Suzuki Poulose <suzuki.poulose@arm.com> Acked-by: Christoffer Dall <christoffer.dall@arm.com> Signed-off-by: Punit Agrawal <punit.agrawal@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>		2018-08-13 15:31:35 +01:00
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hyp	kvm/arm fixes for 4.16, take 2	2018-03-19 17:43:01 +00:00
vgic	KVM: arm/arm64: vgic: Do not use spin_lock_irqsave/restore with irq disabled	2018-08-12 12:15:18 +01:00
aarch32.c	KVM: arm/arm64: Prepare to handle deferred save/restore of SPSR_EL1	2018-03-19 10:53:17 +00:00
arch_timer.c	KVM: arm/arm64: Fix lost IRQs from emulated physcial timer when blocked	2018-07-31 07:53:20 +01:00
arm.c	KVM: arm: Add 32bit get/set events support	2018-07-21 16:02:32 +01:00
mmio.c	KVM: Fix stack-out-of-bounds read in write_mmio	2017-12-18 12:57:01 +01:00
mmu.c	KVM: arm/arm64: Skip updating PMD entry if no change	2018-08-13 15:31:35 +01:00
perf.c	KVM: arm/arm64: Move shared files to virt/kvm/arm	2017-05-04 13:57:26 +02:00
pmu.c	KVM: arm64: Rewrite system register accessors to read/write functions	2018-03-19 10:53:16 +00:00
psci.c	arm64: KVM: Add ARCH_WORKAROUND_2 discovery through ARCH_FEATURES_FUNC_ID	2018-05-31 18:00:59 +01:00
trace.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00