linux-kernel - [PATCH v3 0/2] KVM: Fix refaulting due to page table update

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Date:   Mon, 13 Aug 2018 11:43:49 +0100
From:   Punit Agrawal <punit.agrawal@....com>
To:     kvmarm@...ts.cs.columbia.edu
Cc:     Punit Agrawal <punit.agrawal@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        suzuki.poulose@....com, marc.zyngier@....com,
        christoffer.dall@....com
Subject: [PATCH v3 0/2] KVM: Fix refaulting due to page table update

Contention when updating a page table entry can lead to unnecessary
refaults. The issue was reported by a user when testing PUD hugepage
support[1] but also exists for PMD and PTE updates though with a lower
probability.

This version -

* fixes a nit reported by Suzuki
* Re-orders the checks when setting PMD hugepage
* drops mistakenly introduced Change-id in the commit message

Thanks,
Punit

[1] https://lkml.org/lkml/2018/7/16/482

Punit Agrawal (2):
  KVM: arm/arm64: Skip updating PMD entry if no change
  KVM: arm/arm64: Skip updating PTE entry if no change

 virt/kvm/arm/mmu.c | 43 ++++++++++++++++++++++++++++++++-----------
 1 file changed, 32 insertions(+), 11 deletions(-)

-- 
2.18.0