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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 ECD31C433F5 for ; Mon, 24 Jan 2022 10:54:15 +0000 (UTC) Received: from localhost ([::1]:49156 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nBwzG-00041k-Ac for qemu-devel@archiver.kernel.org; Mon, 24 Jan 2022 05:54:14 -0500 Received: from eggs.gnu.org ([209.51.188.92]:51220) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nBwy1-0002kJ-6l for qemu-devel@nongnu.org; Mon, 24 Jan 2022 05:52:57 -0500 Received: from frasgout.his.huawei.com ([185.176.79.56]:2167) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nBwxy-0003tl-Jj for qemu-devel@nongnu.org; Mon, 24 Jan 2022 05:52:56 -0500 Received: from fraeml708-chm.china.huawei.com (unknown [172.18.147.226]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4Jj6Ck41MCz689yj; Mon, 24 Jan 2022 18:48:34 +0800 (CST) Received: from lhreml710-chm.china.huawei.com (10.201.108.61) by fraeml708-chm.china.huawei.com (10.206.15.36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Mon, 24 Jan 2022 11:52:47 +0100 Received: from localhost (10.47.74.148) by lhreml710-chm.china.huawei.com (10.201.108.61) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Mon, 24 Jan 2022 10:52:46 +0000 Date: Mon, 24 Jan 2022 10:52:45 +0000 To: Samarth Saxena CC: "qemu-devel@nongnu.org" Subject: Re: [CXL HDM DECODER PROGRAMMING] - Question: Does Qemu program HDM decoder register of the CXL endpoint? Message-ID: <20220124105245.00006aa1@Huawei.com> In-Reply-To: References: Organization: Huawei Technologies Research and Development (UK) Ltd. X-Mailer: Claws Mail 4.0.0 (GTK+ 3.24.29; i686-w64-mingw32) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.47.74.148] X-ClientProxiedBy: lhreml739-chm.china.huawei.com (10.201.108.189) To lhreml710-chm.china.huawei.com (10.201.108.61) X-CFilter-Loop: Reflected Received-SPF: pass client-ip=185.176.79.56; envelope-from=jonathan.cameron@huawei.com; helo=frasgout.his.huawei.com X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Reply-to: Jonathan Cameron From: Jonathan Cameron via On Sun, 23 Jan 2022 16:13:29 +0000 Samarth Saxena wrote: > Hi All, > > I had a question about the CXL HDM Decoder register programming. > Is there any part of Qemu, that automatically programs the enable bit > of the HDM decoder register in the Component registers of the CXL > endpoint? The CDR (component registers) are hosted inside the memory > of the CXL endpoint. Hi Samarth, Given upstream QEMU doesn't support any CXL emulation at all currently the answer to that is a no :) I hope to post a v4 patch series for CXL support later this week. Once that's out perhaps we can pick up this question again. Thanks, Jonathan > > Regards, > [CadenceLogoRed185Regcopy1583174817new51584636989.png] > Samarth Saxena > Sr Principal Software Engineer > T: 911204308300 > [UIcorrectsize1583179003.png] > [16066EmailSignatureFortune100Best2021White92x1271617625037.png] > > > > >