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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7B9A9C00144 for ; Fri, 29 Jul 2022 19:03:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238837AbiG2TDr (ORCPT ); Fri, 29 Jul 2022 15:03:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51618 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238666AbiG2TDH (ORCPT ); Fri, 29 Jul 2022 15:03:07 -0400 Received: from mail.efficios.com (mail.efficios.com [167.114.26.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E84E989A48; Fri, 29 Jul 2022 12:02:55 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by mail.efficios.com (Postfix) with ESMTP id 032D6319289; Fri, 29 Jul 2022 15:02:55 -0400 (EDT) Received: from mail.efficios.com ([127.0.0.1]) by localhost (mail03.efficios.com [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id C_e5cOg2bAPe; Fri, 29 Jul 2022 15:02:54 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mail.efficios.com (Postfix) with ESMTP id 4A9EC318AAA; Fri, 29 Jul 2022 15:02:48 -0400 (EDT) DKIM-Filter: OpenDKIM Filter v2.10.3 mail.efficios.com 4A9EC318AAA DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=efficios.com; s=default; t=1659121368; bh=84B9YOyXv7c3EB71cteYmLNG2oHcoRDleMv6nuC252o=; h=From:To:Date:Message-Id; b=o3UsOEmjBfGQi5AiHHd+MmgnHXS8IluYh/0o7KlOtfbrUVy0zOq290Ha0tRvV/tlc /aAKOu8B2GwCfBXwh3o3hjL7/Il3ToI3tVbA8YobUZ/cvuc5qocC6s81E1bmr1mFY3 2aBDs138lLCfyusGSJNJSoVJuQiU6Ncc10mqdnNl25zy8zJt0mqvSW4IqWohHgdaF/ etE2gZ+pb/ZsGH5Q2zTOymhZljGRyKjPAXGP3Ch95JJpyIU1eKGXXJKoIcJNhvHyQg LWNVozDQSdSHeYtuVXFJh5FEbu7MMfacsZxAapsOyRVLVbfCjv2PL6yl16lSYBgOnH un9m3pAcEvDOA== X-Virus-Scanned: amavisd-new at efficios.com Received: from mail.efficios.com ([127.0.0.1]) by localhost (mail03.efficios.com [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id 6du7qYx850Fh; Fri, 29 Jul 2022 15:02:48 -0400 (EDT) Received: from localhost.localdomain (192-222-180-24.qc.cable.ebox.net [192.222.180.24]) by mail.efficios.com (Postfix) with ESMTPSA id 9B087318D7A; Fri, 29 Jul 2022 15:02:44 -0400 (EDT) From: Mathieu Desnoyers To: Peter Zijlstra Cc: linux-kernel@vger.kernel.org, Thomas Gleixner , "Paul E . McKenney" , Boqun Feng , "H . Peter Anvin" , Paul Turner , linux-api@vger.kernel.org, Christian Brauner , Florian Weimer , David.Laight@ACULAB.COM, carlos@redhat.com, Peter Oskolkov , Mathieu Desnoyers Subject: [PATCH v3 12/23] selftests/rseq: Implement rseq vm_vcpu_id field support Date: Fri, 29 Jul 2022 15:02:14 -0400 Message-Id: <20220729190225.12726-13-mathieu.desnoyers@efficios.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220729190225.12726-1-mathieu.desnoyers@efficios.com> References: <20220729190225.12726-1-mathieu.desnoyers@efficios.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Signed-off-by: Mathieu Desnoyers --- tools/testing/selftests/rseq/rseq-abi.h | 9 +++++++++ tools/testing/selftests/rseq/rseq.h | 10 ++++++++++ 2 files changed, 19 insertions(+) diff --git a/tools/testing/selftests/rseq/rseq-abi.h b/tools/testing/selftests/rseq/rseq-abi.h index a1faa9162d52..1ee4740ebe94 100644 --- a/tools/testing/selftests/rseq/rseq-abi.h +++ b/tools/testing/selftests/rseq/rseq-abi.h @@ -155,6 +155,15 @@ struct rseq_abi { */ __u32 node_id; + /* + * Restartable sequences vm_vcpu_id field. Updated by the kernel. Read by + * user-space with single-copy atomicity semantics. This field should + * only be read by the thread which registered this data structure. + * Aligned on 32-bit. Contains the current thread's virtual CPU ID + * (allocated uniquely within a memory space). + */ + __u32 vm_vcpu_id; + /* * Flexible array member at end of structure, after last feature field. */ diff --git a/tools/testing/selftests/rseq/rseq.h b/tools/testing/selftests/rseq/rseq.h index fd17d0e54a1b..003e0e3750ce 100644 --- a/tools/testing/selftests/rseq/rseq.h +++ b/tools/testing/selftests/rseq/rseq.h @@ -191,6 +191,16 @@ static inline uint32_t rseq_current_node_id(void) return RSEQ_ACCESS_ONCE(rseq_get_abi()->node_id); } +static inline bool rseq_vm_vcpu_id_available(void) +{ + return (int) rseq_feature_size >= rseq_offsetofend(struct rseq_abi, vm_vcpu_id); +} + +static inline uint32_t rseq_current_vm_vcpu_id(void) +{ + return RSEQ_ACCESS_ONCE(rseq_get_abi()->vm_vcpu_id); +} + static inline void rseq_clear_rseq_cs(void) { RSEQ_WRITE_ONCE(rseq_get_abi()->rseq_cs.arch.ptr, 0); -- 2.17.1