From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1133BC4646D for ; Mon, 13 Aug 2018 10:44:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BFDB421721 for ; Mon, 13 Aug 2018 10:44:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BFDB421721 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728658AbeHMNZq (ORCPT ); Mon, 13 Aug 2018 09:25:46 -0400 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:56786 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728356AbeHMNZq (ORCPT ); Mon, 13 Aug 2018 09:25:46 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 4CD087A9; Mon, 13 Aug 2018 03:44:04 -0700 (PDT) Received: from localhost (e105922-lin.emea.arm.com [10.4.13.28]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id BE64C3F5D0; Mon, 13 Aug 2018 03:44:03 -0700 (PDT) From: Punit Agrawal To: kvmarm@lists.cs.columbia.edu Cc: Punit Agrawal , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, suzuki.poulose@arm.com, marc.zyngier@arm.com, christoffer.dall@arm.com Subject: [PATCH v3 0/2] KVM: Fix refaulting due to page table update Date: Mon, 13 Aug 2018 11:43:49 +0100 Message-Id: <20180813104351.24595-1-punit.agrawal@arm.com> X-Mailer: git-send-email 2.18.0 X-ARM-No-Footer: FoSSMail Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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