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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 2F387C433E0 for ; Mon, 22 Jun 2020 16:26:11 +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 0A0C220767 for ; Mon, 22 Jun 2020 16:26:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0A0C220767 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=citrix.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 1jnPGh-0000vo-EF; Mon, 22 Jun 2020 16:25:59 +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 1jnPGg-0000vh-1W for xen-devel@lists.xenproject.org; Mon, 22 Jun 2020 16:25:58 +0000 X-Inumbo-ID: 0cd64172-b4a5-11ea-beaa-12813bfff9fa Received: from esa3.hc3370-68.iphmx.com (unknown [216.71.145.155]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 0cd64172-b4a5-11ea-beaa-12813bfff9fa; Mon, 22 Jun 2020 16:25:57 +0000 (UTC) Authentication-Results: esa3.hc3370-68.iphmx.com; dkim=none (message not signed) header.i=none IronPort-SDR: JPCS0cf80VYvtfI+8vgub0sN+VBISTRtnfsNXZzckre2EgeRDcSdOil7WWcERMKRmwwpNq2svd 92QQGK6sXKJkASCg1kpXaaTpmxOHvlOWH+cEvs9n6NtebPFzxuov0oSGVp2mew4pkcOSeou5RO Kmd2uzdRPIbcS30yPLOe/9I2clK/8ZJkx9gvoCmMsGM0Q0fNcno+Lypx1dsr0bqM0rQBqPRy1e qkdXBs2ISYQWTUThmzaGtVlo1mcDCER2yAi93ckXTgyFf85m/UdPrpStWv/RrgJeYFNNZ2tX+W gMg= X-SBRS: 2.7 X-MesageID: 20639313 X-Ironport-Server: esa3.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.75,267,1589256000"; d="scan'208";a="20639313" Date: Mon, 22 Jun 2020 18:25:49 +0200 From: Roger Pau =?utf-8?B?TW9ubsOp?= To: Jan Beulich Subject: Re: [PATCH v2 4/7] x86/vmx: add do_vmtrace_op Message-ID: <20200622162237.GN735@Air-de-Roger> References: <122238637.9820857.1592523264685.JavaMail.zimbra@cert.pl> <1005194077.9820950.1592523663199.JavaMail.zimbra@cert.pl> <4e040500-0532-2231-f5b7-c61e97a0a0c5@suse.com> <800738193.11403725.1592836530558.JavaMail.zimbra@cert.pl> <87576264-e7df-2590-f141-351d76baac7a@suse.com> <1130937743.11428389.1592841763323.JavaMail.zimbra@cert.pl> <5b7dd58f-2dc1-32bc-3add-d896631734a4@suse.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <5b7dd58f-2dc1-32bc-3add-d896631734a4@suse.com> X-ClientProxiedBy: AMSPEX02CAS01.citrite.net (10.69.22.112) To AMSPEX02CL02.citrite.net (10.69.22.126) 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: Kevin Tian , Stefano Stabellini , Julien Grall , Wei Liu , Andrew Cooper , =?utf-8?Q?Micha=C5=82_Leszczy=C5=84ski?= , Ian Jackson , George Dunlap , "Kang, Luwei" , Jun Nakajima , Tamas K Lengyel , Xen-devel Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" On Mon, Jun 22, 2020 at 06:16:57PM +0200, Jan Beulich wrote: > On 22.06.2020 18:02, Michał Leszczyński wrote: > > ----- 22 cze 2020 o 17:22, Jan Beulich jbeulich@suse.com napisał(a): > >> On 22.06.2020 16:35, Michał Leszczyński wrote: > >>> ----- 22 cze 2020 o 15:25, Jan Beulich jbeulich@suse.com napisał(a): > > It's also not "many gigabytes". In most use cases a buffer of 16/32/64 MB > > would suffice, I think. > > But that one such buffer per vCPU, isn't it? Plus these buffers > need to be physically contiguous, which is an additional possibly > severe constraint. FTR, from my reading of the SDM you can use a mode called ToPA where the buffer is some kind of linked list of tables that map to output regions. That would be nice, but IMO it should be implemented in a next iteration after the basic support is in. Roger.