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=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 1B3B8C433E1 for ; Thu, 2 Jul 2020 13:57:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0381320772 for ; Thu, 2 Jul 2020 13:57:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729528AbgGBN5L (ORCPT ); Thu, 2 Jul 2020 09:57:11 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:7356 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729407AbgGBN5K (ORCPT ); Thu, 2 Jul 2020 09:57:10 -0400 Received: from DGGEMS406-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id 8000126C23D4911ADAAC; Thu, 2 Jul 2020 21:56:10 +0800 (CST) Received: from DESKTOP-5IS4806.china.huawei.com (10.174.187.22) by DGGEMS406-HUB.china.huawei.com (10.3.19.206) with Microsoft SMTP Server id 14.3.487.0; Thu, 2 Jul 2020 21:56:01 +0800 From: Keqian Zhu To: , , , CC: Catalin Marinas , Marc Zyngier , James Morse , Will Deacon , "Suzuki K Poulose" , Steven Price , "Sean Christopherson" , Julien Thierry , Mark Brown , "Thomas Gleixner" , Andrew Morton , Alexios Zavras , , , , Keqian Zhu Subject: [PATCH v2 1/8] KVM: arm64: Set DBM bit for writable PTEs Date: Thu, 2 Jul 2020 21:55:49 +0800 Message-ID: <20200702135556.36896-2-zhukeqian1@huawei.com> X-Mailer: git-send-email 2.8.4.windows.1 In-Reply-To: <20200702135556.36896-1-zhukeqian1@huawei.com> References: <20200702135556.36896-1-zhukeqian1@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.174.187.22] X-CFilter-Loop: Reflected Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org DBM bit is used by MMU to differentiate a genuinely non-writable page from a page that is only temporarily non-writable in order to mark dirty. Signed-off-by: Keqian Zhu Signed-off-by: Peng Liang --- arch/arm64/include/asm/kvm_mmu.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h index b12bfc1f051a..2700442b0f75 100644 --- a/arch/arm64/include/asm/kvm_mmu.h +++ b/arch/arm64/include/asm/kvm_mmu.h @@ -169,6 +169,10 @@ void kvm_clear_hyp_idmap(void); static inline pte_t kvm_s2pte_mkwrite(pte_t pte) { pte_val(pte) |= PTE_S2_RDWR; + + if (IS_ENABLED(CONFIG_ARM64_HW_AFDBM)) + pte_val(pte) |= PTE_DBM; + return pte; } -- 2.19.1