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=-10.0 required=3.0 tests=INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,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 393C2C47409 for ; Fri, 13 Dec 2019 21:33:24 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id B18BD2467A for ; Fri, 13 Dec 2019 21:33:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B18BD2467A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvmarm-bounces@lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id E09834AEAC; Fri, 13 Dec 2019 13:28:00 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7D8R6taEdLpL; Fri, 13 Dec 2019 13:27:59 -0500 (EST) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 018E94AEEA; Fri, 13 Dec 2019 13:27:56 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 1AA664AEC1 for ; Fri, 13 Dec 2019 13:27:55 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ApLiQDGCkhj2 for ; Fri, 13 Dec 2019 13:27:54 -0500 (EST) Received: from inca-roads.misterjones.org (inca-roads.misterjones.org [213.251.177.50]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 4F4334AEB5 for ; Fri, 13 Dec 2019 13:27:53 -0500 (EST) Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why.lan) by cheepnis.misterjones.org with esmtpsa (TLSv1.2:DHE-RSA-AES128-GCM-SHA256:128) (Exim 4.80) (envelope-from ) id 1ifpdI-0001O7-Qa; Fri, 13 Dec 2019 19:25:44 +0100 From: Marc Zyngier To: Subject: [PATCH 6/7] KVM: arm/arm64: Elide CMOs when retrying a block mapping Date: Fri, 13 Dec 2019 18:25:02 +0000 Message-Id: <20191213182503.14460-7-maz@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191213182503.14460-1-maz@kernel.org> References: <20191213182503.14460-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, jhogan@kernel.org, paulus@ozlabs.org, pbonzini@redhat.com, rkrcmar@redhat.com, sean.j.christopherson@intel.com, vkuznets@redhat.com, wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-mips@vger.kernel.org, kvm-ppc@vger.kernel.org, kvm@vger.kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on cheepnis.misterjones.org); SAEximRunCond expanded to false Cc: kvm-ppc@vger.kernel.org, Wanpeng Li , kvm@vger.kernel.org, James Hogan , Joerg Roedel , linux-mips@vger.kernel.org, Sean Christopherson , Paul Mackerras , linux-arm-kernel@lists.infradead.org, Paolo Bonzini , Vitaly Kuznetsov , kvmarm@lists.cs.columbia.edu, Jim Mattson X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu In the rare cases where we're converting a table mapping in a block mapping, there is no point in cleaning memory to the PoC, as we're about to remap the exact same pages again, only as a block mapping. Signed-off-by: Marc Zyngier --- virt/kvm/arm/mmu.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c index d7c710491d26..c55022dbac89 100644 --- a/virt/kvm/arm/mmu.c +++ b/virt/kvm/arm/mmu.c @@ -1109,7 +1109,8 @@ static int stage2_set_pmd_huge(struct kvm *kvm, struct kvm_mmu_memory_cache * get handled accordingly. */ if (!pmd_thp_or_huge(old_pmd)) { - unmap_stage2_range(kvm, addr & S2_PMD_MASK, S2_PMD_SIZE, 0); + unmap_stage2_range(kvm, addr & S2_PMD_MASK, S2_PMD_SIZE, + KVM_UNMAP_ELIDE_CMO); goto retry; } /* @@ -1159,7 +1160,8 @@ static int stage2_set_pud_huge(struct kvm *kvm, struct kvm_mmu_memory_cache *cac * the range for this block and retry. */ if (!stage2_pud_huge(kvm, old_pud)) { - unmap_stage2_range(kvm, addr & S2_PUD_MASK, S2_PUD_SIZE, 0); + unmap_stage2_range(kvm, addr & S2_PUD_MASK, S2_PUD_SIZE, + KVM_UNMAP_ELIDE_CMO); goto retry; } -- 2.20.1 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm