Message ID | 20180813145755.16566-38-marc.zyngier@arm.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show
Return-Path: <kvm-owner@kernel.org> Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 55E3114E2 for <patchwork-kvm@patchwork.kernel.org>; Mon, 13 Aug 2018 15:00:50 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4631129493 for <patchwork-kvm@patchwork.kernel.org>; Mon, 13 Aug 2018 15:00:50 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4460E2949B; Mon, 13 Aug 2018 15:00:50 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E0A5A29493 for <patchwork-kvm@patchwork.kernel.org>; Mon, 13 Aug 2018 15:00:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730025AbeHMRnZ (ORCPT <rfc822;patchwork-kvm@patchwork.kernel.org>); Mon, 13 Aug 2018 13:43:25 -0400 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:60730 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729794AbeHMRnZ (ORCPT <rfc822;kvm@vger.kernel.org>); Mon, 13 Aug 2018 13:43:25 -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 41DE880D; Mon, 13 Aug 2018 08:00:48 -0700 (PDT) Received: from approximate.Emea.Arm.com (approximate.Emea.Arm.com [10.4.13.119]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 4FF8D3F5D0; Mon, 13 Aug 2018 08:00:45 -0700 (PDT) From: Marc Zyngier <marc.zyngier@arm.com> To: Paolo Bonzini <pbonzini@redhat.com>, =?utf-8?b?UmFkaW0gS3LEjW3DocWZ?= <rkrcmar@redhat.com> Cc: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, Andre Przywara <andre.przywara@arm.com>, Andrew Jones <drjones@redhat.com>, Catalin Marinas <catalin.marinas@arm.com>, Christoffer Dall <christoffer.dall@arm.com>, Dongjiu Geng <gengdongjiu@huawei.com>, Eric Auger <eric.auger@redhat.com>, "Gustavo A . R . Silva" <gustavo@embeddedor.com>, James Morse <james.morse@arm.com>, Jia He <jia.he@hxt-semitech.com>, Kees Cook <keescook@chromium.org>, Mark Rutland <mark.rutland@arm.com>, Punit Agrawal <punit.agrawal@arm.com>, Suzuki Poulose <suzuki.poulose@arm.com> Subject: [PATCH 37/37] KVM: arm/arm64: Skip updating PTE entry if no change Date: Mon, 13 Aug 2018 15:57:55 +0100 Message-Id: <20180813145755.16566-38-marc.zyngier@arm.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180813145755.16566-1-marc.zyngier@arm.com> References: <20180813145755.16566-1-marc.zyngier@arm.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: <kvm.vger.kernel.org> X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP |
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[01/37] arm64: KVM: Add support for Stage-2 control of memory types and cacheability
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diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c index 13dfe36501aa..91aaf73b00df 100644 --- a/virt/kvm/arm/mmu.c +++ b/virt/kvm/arm/mmu.c @@ -1147,6 +1147,10 @@ static int stage2_set_pte(struct kvm *kvm, struct kvm_mmu_memory_cache *cache, /* Create 2nd stage page table mapping - Level 3 */ old_pte = *pte; if (pte_present(old_pte)) { + /* Skip page table update if there is no change */ + if (pte_val(old_pte) == pte_val(*new_pte)) + return 0; + kvm_set_pte(pte, __pte(0)); kvm_tlb_flush_vmid_ipa(kvm, addr); } else {