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 5CE37C433FE for ; Thu, 3 Nov 2022 20:05:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231561AbiKCUFc (ORCPT ); Thu, 3 Nov 2022 16:05:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54550 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230497AbiKCUFA (ORCPT ); Thu, 3 Nov 2022 16:05:00 -0400 Received: from smtpout.efficios.com (smtpout.efficios.com [167.114.26.122]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DA32320362; Thu, 3 Nov 2022 13:04:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=efficios.com; s=smtpout1; t=1667505899; bh=fkx/2owExzHUCN4g/xHByxaw+klP4dt2rTfC0R62Avo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=t5i7poKYqZ5elj2LTCnnwveYuSn5ZrTHELnjzsWSLvubAUlozPEaDblMqxefhKnQe E5CrovNy6klwz3GyHg08/BrHeYUItialMcBXtoU1ns9D9pRUxfcndQSmbfWHdgTbby /6npPr4NqWI8TNkYV2vQTE28WIt88YrXsnaW3Dm12W02OB7EGHGDh0rN8K69i4BDfP cSpehhdTiaotQuBIaYAGvTfy36STLJKgQfyDrwRhpwRK2wD4AsybWxibZ3Se9FiexO iHqm5Oi4xP5a9ASKp9ZDikxC5fqMNQNObVULOhEo76OyVLOpXUZmCSbiiKk7bxEKz4 arj96J19m1/eA== Received: from localhost.localdomain (192-222-180-24.qc.cable.ebox.net [192.222.180.24]) by smtpout.efficios.com (Postfix) with ESMTPSA id 4N3F966x8fzg2l; Thu, 3 Nov 2022 16:04:58 -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 , Alexander Mikhalitsyn , Chris Kennelly , Mathieu Desnoyers Subject: [PATCH v5 11/24] selftests/rseq: Implement rseq vm_vcpu_id field support Date: Thu, 3 Nov 2022 16:03:46 -0400 Message-Id: <20221103200359.328736-12-mathieu.desnoyers@efficios.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221103200359.328736-1-mathieu.desnoyers@efficios.com> References: <20221103200359.328736-1-mathieu.desnoyers@efficios.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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); -- 2.25.1