From patchwork Mon May 25 11:24:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: zhukeqian X-Patchwork-Id: 11568605 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0887A1392 for ; Mon, 25 May 2020 11:26:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E463A20787 for ; Mon, 25 May 2020 11:26:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390160AbgEYLZM (ORCPT ); Mon, 25 May 2020 07:25:12 -0400 Received: from szxga06-in.huawei.com ([45.249.212.32]:36940 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2389897AbgEYLZL (ORCPT ); Mon, 25 May 2020 07:25:11 -0400 Received: from DGGEMS401-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id 6B0142A7762008D953ED; Mon, 25 May 2020 19:25:09 +0800 (CST) Received: from DESKTOP-5IS4806.china.huawei.com (10.173.221.230) by DGGEMS401-HUB.china.huawei.com (10.3.19.201) with Microsoft SMTP Server id 14.3.487.0; Mon, 25 May 2020 19:25:02 +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 , Peng Liang Subject: [RFC PATCH 1/7] KVM: arm64: Add some basic functions for hw DBM Date: Mon, 25 May 2020 19:24:00 +0800 Message-ID: <20200525112406.28224-2-zhukeqian1@huawei.com> X-Mailer: git-send-email 2.8.4.windows.1 In-Reply-To: <20200525112406.28224-1-zhukeqian1@huawei.com> References: <20200525112406.28224-1-zhukeqian1@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.173.221.230] X-CFilter-Loop: Reflected Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Prepare some basic functions used by following patches to support hardware DBM. Signed-off-by: Keqian Zhu Signed-off-by: Peng Liang --- arch/arm64/include/asm/kvm_mmu.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h index 30b0e8d6b895..8df078f0ee67 100644 --- a/arch/arm64/include/asm/kvm_mmu.h +++ b/arch/arm64/include/asm/kvm_mmu.h @@ -285,6 +285,30 @@ 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 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