From patchwork Thu Jul 11 14:25:31 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandre Chartre X-Patchwork-Id: 11040161 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 A9CCF112C for ; Thu, 11 Jul 2019 14:29:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 993B528ABE for ; Thu, 11 Jul 2019 14:29:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8CFF328AD9; Thu, 11 Jul 2019 14:29:25 +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 37B6428ABE for ; Thu, 11 Jul 2019 14:29:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728943AbfGKO2Q (ORCPT ); Thu, 11 Jul 2019 10:28:16 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:37756 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728926AbfGKO2P (ORCPT ); Thu, 11 Jul 2019 10:28:15 -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 x6BEO8vO001464; Thu, 11 Jul 2019 14:26:48 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=2d2Yv2y5zLW9fLZ4ZOO2tadSx6yS9UU2pD1uUkqP2I4=; b=PEK1VY+3UVMeYt+RB002bYINLbdCxWtdVaXXuLcUErNmdDVQeXpj0b9OMDpmCIqqZa4Y 9PvB0Lnb9b0uhxGmrMFXcR44+qa8LQlt1HNPX0Dv/WgAESNOrwyxaWcdUWdyw5aYvMo9 6hMEg+A/C1vRmGh2CVcZaeUmibNGRM+Z0ynXpbec7GOZxoWF9wbcV+Bk5OzwKInmLI0/ 2E7YCwLLpvnIvEy49dwDdr51/iqNr/GOk+NSxBuovD4OQOPclLfLK8Qy+EAEEUquuZ8L HADMT7wC0JoiunyhO1kAnDjpVZAnFUxpCSF1OfqJMoGYFOwX+PMYYSzDX1GbCZ5/xKmc PQ== Received: from aserv0021.oracle.com (aserv0021.oracle.com [141.146.126.233]) by userp2130.oracle.com with ESMTP id 2tjk2u0e24-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 11 Jul 2019 14:26:48 +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 x6BEPcuC021444; Thu, 11 Jul 2019 14:26:44 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 19/26] mm/asi: Add option to map RCU data Date: Thu, 11 Jul 2019 16:25:31 +0200 Message-Id: <1562855138-19507-20-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=999 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 an option to map RCU data when creating an ASI. This will map the percpu rcu_data (which is not exported by the kernel), and allow ASI to use RCU without faulting. Signed-off-by: Alexandre Chartre --- arch/x86/include/asm/asi.h | 1 + arch/x86/mm/asi.c | 4 ++++ 2 files changed, 5 insertions(+), 0 deletions(-) diff --git a/arch/x86/include/asm/asi.h b/arch/x86/include/asm/asi.h index a277e43..8199618 100644 --- a/arch/x86/include/asm/asi.h +++ b/arch/x86/include/asm/asi.h @@ -18,6 +18,7 @@ #define ASI_MAP_STACK_CANARY 0x01 /* map stack canary */ #define ASI_MAP_CPU_PTR 0x02 /* for get_cpu_var()/this_cpu_ptr() */ #define ASI_MAP_CURRENT_TASK 0x04 /* map the current task */ +#define ASI_MAP_RCU_DATA 0x08 /* map rcu data */ enum page_table_level { PGT_LEVEL_PTE, diff --git a/arch/x86/mm/asi.c b/arch/x86/mm/asi.c index acd1135..20c23dc 100644 --- a/arch/x86/mm/asi.c +++ b/arch/x86/mm/asi.c @@ -7,6 +7,7 @@ #include #include +#include #include #include #include @@ -16,6 +17,8 @@ #include #include +#include "../../../kernel/rcu/tree.h" + /* ASI sessions, one per cpu */ DEFINE_PER_CPU_PAGE_ALIGNED(struct asi_session, cpu_asi_session); @@ -29,6 +32,7 @@ struct asi_map_option asi_map_percpu_options[] = { { ASI_MAP_STACK_CANARY, &fixed_percpu_data, sizeof(fixed_percpu_data) }, { ASI_MAP_CPU_PTR, &this_cpu_off, sizeof(this_cpu_off) }, { ASI_MAP_CURRENT_TASK, ¤t_task, sizeof(current_task) }, + { ASI_MAP_RCU_DATA, &rcu_data, sizeof(rcu_data) }, }; static void asi_log_fault(struct asi *asi, struct pt_regs *regs,