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 X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7E706C433DF for ; Mon, 6 Jul 2020 10:37:28 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 5D1192070B for ; Mon, 6 Jul 2020 10:37:28 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5D1192070B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1jsOUs-0005AI-EW; Mon, 06 Jul 2020 10:37:14 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1jsOUq-0005AC-S8 for xen-devel@lists.xenproject.org; Mon, 06 Jul 2020 10:37:12 +0000 X-Inumbo-ID: a60f2348-bf74-11ea-8c5a-12813bfff9fa Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id a60f2348-bf74-11ea-8c5a-12813bfff9fa; Mon, 06 Jul 2020 10:37:11 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 20C2BAC91; Mon, 6 Jul 2020 10:37:11 +0000 (UTC) Subject: Re: [PATCH v5 09/11] x86/domctl: add XEN_DOMCTL_vmtrace_op To: Julien Grall , =?UTF-8?Q?Micha=c5=82_Leszczy=c5=84ski?= References: <6763525a-dca6-dfe5-b417-96e69a22d927@xen.org> From: Jan Beulich Message-ID: <1fe71a95-1757-ca18-1d36-c3712e7b6fdf@suse.com> Date: Mon, 6 Jul 2020 12:37:09 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <6763525a-dca6-dfe5-b417-96e69a22d927@xen.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Stefano Stabellini , tamas.lengyel@intel.com, Wei Liu , Andrew Cooper , Ian Jackson , George Dunlap , luwei.kang@intel.com, xen-devel@lists.xenproject.org, =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" On 06.07.2020 12:31, Julien Grall wrote: > On 05/07/2020 19:55, Michał Leszczyński wrote: >> +/* XEN_DOMCTL_vmtrace_op: Perform VM tracing related operation */ >> +#if defined(__XEN__) || defined(__XEN_TOOLS__) >> + >> +struct xen_domctl_vmtrace_op { >> + /* IN variable */ >> + uint32_t cmd; >> +/* Enable/disable external vmtrace for given domain */ >> +#define XEN_DOMCTL_vmtrace_pt_enable 1 >> +#define XEN_DOMCTL_vmtrace_pt_disable 2 >> +#define XEN_DOMCTL_vmtrace_pt_get_offset 3 >> + domid_t domain; > > AFAICT, there is a 16-bit implicit padding here and ... > > >> + uint32_t vcpu; > > ... a 32-bit implicit padding here. I would suggest to make > the two explicit. > > We possibly want to check they are also always zero. Not just possibly imo - we should. Jan