From patchwork Thu Jul 11 14:25:24 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandre Chartre X-Patchwork-Id: 11040137 Return-Path: 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 0D2D11395 for ; Thu, 11 Jul 2019 14:28:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F1F2628A5A for ; Thu, 11 Jul 2019 14:28:47 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E5AB428AC8; Thu, 11 Jul 2019 14:28:47 +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=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable 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 9604328A5A for ; Thu, 11 Jul 2019 14:28:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729082AbfGKO2q (ORCPT ); Thu, 11 Jul 2019 10:28:46 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:38288 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729074AbfGKO2q (ORCPT ); Thu, 11 Jul 2019 10:28:46 -0400 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x6BEOKHZ001595; Thu, 11 Jul 2019 14:26:25 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=corp-2018-07-02; bh=gDByh8p+inBGj8eNOkt+0s0ErRCor6nCeXzUp1uJmZ0=; b=uIvYew5i+/N3gKnyr4ociYqq+qt56BKvpfHx2yG6ELbiXTDFF1FnRFdNiTxKLqzKpugT 7rZFZ27tp3XeOzJIDBEQWKZlGMdD04zWtCMR9kz9rtKT/I1eEKjmUoR0EfXOS4LZP41X SaOmMD0h5rmiZKjuWODlCFnTwFv/w3OU84qMp7I8vBQjvkB4kLSw+vU/HUfR9FiS4qmM dt9lswqhmPEYZvrjigJDb4qNQfKlbGFfmUQluSi/uyNCjdt/jH+m3QqAeoRgbBE5SECi sbhB6HhXJDdRZ5C1Vh+uI9HzCIOa4DMf+C+kQvxHt3TG4Fqj9spPHDE/SpvfNokpoD2Z Tw== Received: from aserv0021.oracle.com (aserv0021.oracle.com [141.146.126.233]) by userp2130.oracle.com with ESMTP id 2tjk2u0dyd-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 11 Jul 2019 14:26:25 +0000 Received: from achartre-desktop.fr.oracle.com (dhcp-10-166-106-34.fr.oracle.com [10.166.106.34]) by aserv0021.oracle.com (8.14.4/8.14.4) with ESMTP id x6BEPcu5021444; Thu, 11 Jul 2019 14:26:21 GMT From: Alexandre Chartre To: pbonzini@redhat.com, rkrcmar@redhat.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, kvm@vger.kernel.org, x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: konrad.wilk@oracle.com, jan.setjeeilers@oracle.com, liran.alon@oracle.com, jwadams@google.com, graf@amazon.de, rppt@linux.vnet.ibm.com, alexandre.chartre@oracle.com Subject: [RFC v2 12/26] mm/asi: Function to copy page-table entries for percpu buffer Date: Thu, 11 Jul 2019 16:25:24 +0200 Message-Id: <1562855138-19507-13-git-send-email-alexandre.chartre@oracle.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1562855138-19507-1-git-send-email-alexandre.chartre@oracle.com> References: <1562855138-19507-1-git-send-email-alexandre.chartre@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9314 signatures=668688 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=895 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907110162 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Provide functions to copy page-table entries from the kernel page-table to an ASI page-table for a percpu buffer. A percpu buffer have a different VA range for each cpu and all them have to be copied. Signed-off-by: Alexandre Chartre --- arch/x86/include/asm/asi.h | 6 ++++++ arch/x86/mm/asi_pagetable.c | 38 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 44 insertions(+), 0 deletions(-) diff --git a/arch/x86/include/asm/asi.h b/arch/x86/include/asm/asi.h index 919129f..912b6a7 100644 --- a/arch/x86/include/asm/asi.h +++ b/arch/x86/include/asm/asi.h @@ -105,6 +105,12 @@ static inline int asi_map_module(struct asi *asi, char *module_name) return asi_map(asi, module->core_layout.base, module->core_layout.size); } +#define ASI_MAP_CPUVAR(asi, cpuvar) \ + asi_map_percpu(asi, &cpuvar, sizeof(cpuvar)) + +extern int asi_map_percpu(struct asi *asi, void *percpu_ptr, size_t size); +extern void asi_unmap_percpu(struct asi *asi, void *percpu_ptr); + /* * Function to exit the current isolation. This is used to abort isolation * when a task using isolation is scheduled out. diff --git a/arch/x86/mm/asi_pagetable.c b/arch/x86/mm/asi_pagetable.c index 7aee236..a4fe867 100644 --- a/arch/x86/mm/asi_pagetable.c +++ b/arch/x86/mm/asi_pagetable.c @@ -804,3 +804,41 @@ void asi_unmap(struct asi *asi, void *ptr) spin_unlock_irqrestore(&asi->lock, flags); } EXPORT_SYMBOL(asi_unmap); + +void asi_unmap_percpu(struct asi *asi, void *percpu_ptr) +{ + void *ptr; + int cpu; + + pr_debug("ASI %p: UNMAP PERCPU %px\n", asi, percpu_ptr); + for_each_possible_cpu(cpu) { + ptr = per_cpu_ptr(percpu_ptr, cpu); + pr_debug("ASI %p: UNMAP PERCPU%d %px\n", asi, cpu, ptr); + asi_unmap(asi, ptr); + } +} +EXPORT_SYMBOL(asi_unmap_percpu); + +int asi_map_percpu(struct asi *asi, void *percpu_ptr, size_t size) +{ + int cpu, err; + void *ptr; + + pr_debug("ASI %p: MAP PERCPU %px\n", asi, percpu_ptr); + for_each_possible_cpu(cpu) { + ptr = per_cpu_ptr(percpu_ptr, cpu); + pr_debug("ASI %p: MAP PERCPU%d %px\n", asi, cpu, ptr); + err = asi_map(asi, ptr, size); + if (err) { + /* + * Need to unmap any percpu mapping which has + * succeeded before the failure. + */ + asi_unmap_percpu(asi, percpu_ptr); + return err; + } + } + + return 0; +} +EXPORT_SYMBOL(asi_map_percpu);