From patchwork Thu Jul 11 14:25:25 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandre Chartre X-Patchwork-Id: 11040173 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 06508112C for ; Thu, 11 Jul 2019 14:29:54 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EBDEC28ABE for ; Thu, 11 Jul 2019 14:29:53 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E004C28AD1; Thu, 11 Jul 2019 14:29:53 +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 94B8E28ABE for ; Thu, 11 Jul 2019 14:29:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728808AbfGKO1y (ORCPT ); Thu, 11 Jul 2019 10:27:54 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:37316 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728823AbfGKO1y (ORCPT ); Thu, 11 Jul 2019 10:27:54 -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 x6BEOAvB001518; Thu, 11 Jul 2019 14:26:29 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=Ag0k+tMlXoCUCjgmP3NxD1Cl4FnNgcaLg1SLsqSglmA=; b=keVQsRLhZyNb/dFJnnzguyu+6Vl7qT1iW80eQJUi6p8HUYNezOn2M6QRB0NcNQhQI7JT 5HACwzQ7vK/fKkmWqNIFxS0mv8uBEA1J5s9pHNXY/wHvMqw/x77ya8pCk5djXXg3w8tA Y+DFHNzDwpT4d81yj2dhIMIFubn8ssOAMPMn8hTz8Cg2l5maUEKHDpqBF2nYVJbVIius zq+q7wJ21XaxrzeREUMqbHN8popuelxmyOtwjWh5plKHWNmsE8C4KEMn9NIt7tf3KMir nsOpTlKGCKH8e0WHGLCVGvgf9UFWaCxJYPAxRKOlsGhf5idexkvlsNaYd43tN8SZVOoQ SA== Received: from aserv0021.oracle.com (aserv0021.oracle.com [141.146.126.233]) by userp2130.oracle.com with ESMTP id 2tjk2u0dyw-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 11 Jul 2019 14:26:28 +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 x6BEPcu6021444; Thu, 11 Jul 2019 14:26:25 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 13/26] mm/asi: Add asi_remap() function Date: Thu, 11 Jul 2019 16:25:25 +0200 Message-Id: <1562855138-19507-14-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=832 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 Add a function to remap an already mapped buffer with a new address in an ASI page-table: the already mapped buffer is unmapped, and a new mapping is added for the specified new address. This is useful to track and remap a buffer which can be freed and then reallocated. Signed-off-by: Alexandre Chartre --- arch/x86/include/asm/asi.h | 1 + arch/x86/mm/asi_pagetable.c | 25 +++++++++++++++++++++++++ 2 files changed, 26 insertions(+), 0 deletions(-) diff --git a/arch/x86/include/asm/asi.h b/arch/x86/include/asm/asi.h index 912b6a7..cf5d198 100644 --- a/arch/x86/include/asm/asi.h +++ b/arch/x86/include/asm/asi.h @@ -84,6 +84,7 @@ extern int asi_map_range(struct asi *asi, void *ptr, size_t size, enum page_table_level level); extern int asi_map(struct asi *asi, void *ptr, unsigned long size); extern void asi_unmap(struct asi *asi, void *ptr); +extern int asi_remap(struct asi *asi, void **mapping, void *ptr, size_t size); /* * Copy the memory mapping for the current module. This is defined as a diff --git a/arch/x86/mm/asi_pagetable.c b/arch/x86/mm/asi_pagetable.c index a4fe867..1ff0c47 100644 --- a/arch/x86/mm/asi_pagetable.c +++ b/arch/x86/mm/asi_pagetable.c @@ -842,3 +842,28 @@ int asi_map_percpu(struct asi *asi, void *percpu_ptr, size_t size) return 0; } EXPORT_SYMBOL(asi_map_percpu); + +int asi_remap(struct asi *asi, void **current_ptrp, void *new_ptr, size_t size) +{ + void *current_ptr = *current_ptrp; + int err; + + if (current_ptr == new_ptr) { + /* no change, already mapped */ + return 0; + } + + if (current_ptr) { + asi_unmap(asi, current_ptr); + *current_ptrp = NULL; + } + + err = asi_map(asi, new_ptr, size); + if (err) + return err; + + *current_ptrp = new_ptr; + + return 0; +} +EXPORT_SYMBOL(asi_remap);