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=-9.7 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=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 E2F57C433DF for ; Tue, 16 Jun 2020 09:37:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B942820767 for ; Tue, 16 Jun 2020 09:37:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728285AbgFPJgR (ORCPT ); Tue, 16 Jun 2020 05:36:17 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:6337 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728250AbgFPJgP (ORCPT ); Tue, 16 Jun 2020 05:36:15 -0400 Received: from DGGEMS414-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id B02EF4A35D21C942F8BC; Tue, 16 Jun 2020 17:36:13 +0800 (CST) Received: from DESKTOP-5IS4806.china.huawei.com (10.173.221.230) by DGGEMS414-HUB.china.huawei.com (10.3.19.214) with Microsoft SMTP Server id 14.3.487.0; Tue, 16 Jun 2020 17:36:04 +0800 From: Keqian Zhu To: , , , CC: Catalin Marinas , Marc Zyngier , James Morse , Will Deacon , "Suzuki K Poulose" , Sean Christopherson , Julien Thierry , Mark Brown , "Thomas Gleixner" , Andrew Morton , Alexios Zavras , , , , Keqian Zhu Subject: [PATCH 01/12] KVM: arm64: Add some basic functions to support hw DBM Date: Tue, 16 Jun 2020 17:35:42 +0800 Message-ID: <20200616093553.27512-2-zhukeqian1@huawei.com> X-Mailer: git-send-email 2.8.4.windows.1 In-Reply-To: <20200616093553.27512-1-zhukeqian1@huawei.com> References: <20200616093553.27512-1-zhukeqian1@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.173.221.230] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Prepare some basic functions to support hardware DBM for PTEs. Signed-off-by: Keqian Zhu Signed-off-by: Peng Liang --- arch/arm64/include/asm/kvm_mmu.h | 36 ++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h index b12bfc1f051a..e0ee6e23d626 100644 --- a/arch/arm64/include/asm/kvm_mmu.h +++ b/arch/arm64/include/asm/kvm_mmu.h @@ -265,6 +265,42 @@ static inline bool kvm_s2pud_young(pud_t pud) return pud_young(pud); } +#ifdef CONFIG_ARM64_HW_AFDBM +static inline bool kvm_hw_dbm_enabled(void) +{ + return !!(read_sysreg(vtcr_el2) & VTCR_EL2_HD); +} + +static inline void kvm_set_s2pte_dbm(pte_t *ptep) +{ + pteval_t old_pteval, pteval; + + pteval = READ_ONCE(pte_val(*ptep)); + do { + old_pteval = pteval; + pteval |= PTE_DBM; + pteval = cmpxchg_relaxed(&pte_val(*ptep), old_pteval, pteval); + } while (pteval != old_pteval); +} + +static inline void kvm_clear_s2pte_dbm(pte_t *ptep) +{ + pteval_t old_pteval, pteval; + + pteval = READ_ONCE(pte_val(*ptep)); + do { + old_pteval = pteval; + pteval &= ~PTE_DBM; + pteval = cmpxchg_relaxed(&pte_val(*ptep), old_pteval, pteval); + } while (pteval != old_pteval); +} + +static inline bool kvm_s2pte_dbm(pte_t *ptep) +{ + return !!(READ_ONCE(pte_val(*ptep)) & PTE_DBM); +} +#endif /* CONFIG_ARM64_HW_AFDBM */ + #define hyp_pte_table_empty(ptep) kvm_page_empty(ptep) #ifdef __PAGETABLE_PMD_FOLDED -- 2.19.1