From patchwork Fri Mar 17 13:19:49 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luca Fancellu X-Patchwork-Id: 13179057 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 lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5ACE6C6FD1D for ; Fri, 17 Mar 2023 13:20:23 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.511075.789935 (Exim 4.92) (envelope-from ) id 1pdA0G-0000eS-KL; Fri, 17 Mar 2023 13:20:16 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 511075.789935; Fri, 17 Mar 2023 13:20:16 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1pdA0G-0000du-CE; Fri, 17 Mar 2023 13:20:16 +0000 Received: by outflank-mailman (input) for mailman id 511075; Fri, 17 Mar 2023 13:20:15 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1pdA0F-0006bB-FN for xen-devel@lists.xenproject.org; Fri, 17 Mar 2023 13:20:15 +0000 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by se1-gles-flk1.inumbo.com (Halon) with ESMTP id 73540f93-c4c6-11ed-b464-930f4c7d94ae; Fri, 17 Mar 2023 14:20:13 +0100 (CET) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 05B201480; Fri, 17 Mar 2023 06:20:57 -0700 (PDT) Received: from e125770.cambridge.arm.com (e125770.arm.com [10.1.195.25]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 598183F64C; Fri, 17 Mar 2023 06:20:12 -0700 (PDT) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 73540f93-c4c6-11ed-b464-930f4c7d94ae From: Luca Fancellu To: xen-devel@lists.xenproject.org Cc: bertrand.marquis@arm.com, wei.chen@arm.com, Stefano Stabellini , Julien Grall , Volodymyr Babchuk Subject: [PATCH v3 10/10] xen/arm: add sve property for dom0less domUs Date: Fri, 17 Mar 2023 13:19:49 +0000 Message-Id: <20230317131949.4031014-11-luca.fancellu@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230317131949.4031014-1-luca.fancellu@arm.com> References: <20230317131949.4031014-1-luca.fancellu@arm.com> MIME-Version: 1.0 Add a device tree property in the dom0less domU configuration to enable the guest to use SVE. Update documentation. Signed-off-by: Luca Fancellu --- Changes from v2: - xen_domctl_createdomain field name has changed into sve_vl and its value is the VL/128, use domainconfig_encode_vl to encode a plain VL in bits. Changes from v1: - No changes Changes from RFC: - Changed documentation --- docs/misc/arm/device-tree/booting.txt | 9 +++++++++ xen/arch/arm/domain_build.c | 7 +++++++ 2 files changed, 16 insertions(+) diff --git a/docs/misc/arm/device-tree/booting.txt b/docs/misc/arm/device-tree/booting.txt index 3879340b5e0a..d74bf9ab1c8b 100644 --- a/docs/misc/arm/device-tree/booting.txt +++ b/docs/misc/arm/device-tree/booting.txt @@ -193,6 +193,15 @@ with the following properties: Optional. Handle to a xen,cpupool device tree node that identifies the cpupool where the guest will be started at boot. +- sve + + Optional. A number that, when above 0, enables SVE for this guest and sets + its maximum SVE vector length. The default value is 0, that means this + guest is not allowed to use SVE, the maximum value allowed is 2048, any + other value must be multiple of 128. + Please note that if the platform supports a lower value of bits, then the + domain creation will fail. + - xen,enhanced A string property. Possible property values are: diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c index aa5ff52b90c2..81af231d1d87 100644 --- a/xen/arch/arm/domain_build.c +++ b/xen/arch/arm/domain_build.c @@ -3964,6 +3964,13 @@ void __init create_domUs(void) d_cfg.max_maptrack_frames = val; } + if ( dt_property_read_u32(node, "sve", &val) ) + { + if ( val > UINT16_MAX ) + panic("sve property value (%"PRIu32") overflow\n", val); + d_cfg.arch.sve_vl = domainconfig_encode_vl(val); + } + /* * The variable max_init_domid is initialized with zero, so here it's * very important to use the pre-increment operator to call