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 0CFB9CDE025 for ; Thu, 26 Sep 2024 16:53:46 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1strjf-0002lE-DO; Thu, 26 Sep 2024 12:52:59 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1strje-0002kh-9s for qemu-devel@nongnu.org; Thu, 26 Sep 2024 12:52:58 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1strjb-00025S-VL for qemu-devel@nongnu.org; Thu, 26 Sep 2024 12:52:58 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1727369574; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=zj9vLyVeTUrkXFtErPVwTTDYQdcUkLzh1lKD/qYC/0s=; b=hQzBWxDAM+ijApamYX6ry0V8Xb0ip8Oo5+29JS8KNxOBvaqXmW9uCXlljuw3DZLYZ0Gp+L yGsSG5O5r3JmYYCLG9S9iVoFnAjs/h6SqA2rTQHkztnxPr1bLCGsI6luemuGS+SuA8OCO7 b/ElfYEks8RMsp9q4aq4JB4aCs5/WZk= Received: from mail-qk1-f199.google.com (mail-qk1-f199.google.com [209.85.222.199]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-182-m_xddXU1N5SfW4EpFUiE_g-1; Thu, 26 Sep 2024 12:52:52 -0400 X-MC-Unique: m_xddXU1N5SfW4EpFUiE_g-1 Received: by mail-qk1-f199.google.com with SMTP id af79cd13be357-7a7fa073718so222396885a.3 for ; Thu, 26 Sep 2024 09:52:52 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1727369572; x=1727974372; h=content-transfer-encoding:in-reply-to:autocrypt:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=zj9vLyVeTUrkXFtErPVwTTDYQdcUkLzh1lKD/qYC/0s=; b=eleYtmYtdVPNTLIiM+DRR86id+bYo+Djug9r4WbEP3ZZl4lN3GTa4qZzMQnEW9JxrV JtsEOpF7jADSP+/H+QrtpP2MIfVru1IyQ5FrQdK47e8hl98faUbdFXsVfRYkCDwplvYZ 6f7XzdRiX1N0ufFFapKxBhs+k841PcjpAwaJHhxmIvBZ/ImDl1ZjN5gNBnSP8N+XM+aV 6g0j9LG24KemIA9HUlBWb5o4AvsyHyfeuNJyaoYuEyG4PQItHKP+mZ7mYUV5P40wPZqr wC9hjJ7Nx0V/aftB4km3bvXY0+FWrHh8p0cmPCBQD2woIbVk3T+X3wyyxTnVATU4T1Ob zEqg== X-Forwarded-Encrypted: i=1; AJvYcCVPKpq8wGlDoyvsFRy+54OHQLTepEI8IYPF2faBXEFna+jSMAmk+fW2Rl9QWUsxBeKC2dV+DP/8w/A0@nongnu.org X-Gm-Message-State: AOJu0YyZedvarRENwXU3QECSpztZeim2K6C4mQgVbPIGuCrEQecY8Ghw DC57wIECDDJO/09TaH5CQzQwV1+j0frUfyt3YUjrjVeAkwDCsEaGOUIm3lUPkM6ZiyGjxl7Vr2k CA5TiVzBQU+ks3yEV0LuCdCQh4DPILgpQEsEddsJsASVdARbL12Rt X-Received: by 2002:a05:620a:4305:b0:7ab:3511:4eda with SMTP id af79cd13be357-7ae37859606mr28692585a.34.1727369572045; Thu, 26 Sep 2024 09:52:52 -0700 (PDT) X-Google-Smtp-Source: AGHT+IHEc18+Y15wl3KbfQPxhfJugWm0iv4GLJ2pqlzsLF1lv3cavBK20N0dqbclFhcsiP8FYcVCfA== X-Received: by 2002:a05:620a:4305:b0:7ab:3511:4eda with SMTP id af79cd13be357-7ae37859606mr28688285a.34.1727369571647; Thu, 26 Sep 2024 09:52:51 -0700 (PDT) Received: from ?IPV6:2a01:e0a:280:24f0:576b:abc6:6396:ed4a? ([2a01:e0a:280:24f0:576b:abc6:6396:ed4a]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7ae3782c5f1sm6537285a.74.2024.09.26.09.52.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 26 Sep 2024 09:52:51 -0700 (PDT) Message-ID: <104676c7-9732-4972-b00e-8f65ce9eb259@redhat.com> Date: Thu, 26 Sep 2024 18:52:47 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC 0/1] Introduce vfio-cxl to support CXL type-2 device passthrough To: Zhi Wang , kvm@vger.kernel.org, linux-cxl@vger.kernel.org Cc: alex.williamson@redhat.com, kevin.tian@intel.com, jgg@nvidia.com, alison.schofield@intel.com, dan.j.williams@intel.com, dave.jiang@intel.com, dave@stgolabs.net, jonathan.cameron@huawei.com, ira.weiny@intel.com, vishal.l.verma@intel.com, alucerop@amd.com, qemu-devel@nongnu.org, acurrid@nvidia.com, cjia@nvidia.com, smitra@nvidia.com, ankita@nvidia.com, aniketa@nvidia.com, kwankhede@nvidia.com, targupta@nvidia.com, zhiwang@kernel.org References: <20240921071440.1915876-1-zhiw@nvidia.com> Content-Language: en-US, fr From: =?UTF-8?Q?C=C3=A9dric_Le_Goater?= Autocrypt: addr=clg@redhat.com; keydata= xsFNBFu8o3UBEADP+oJVJaWm5vzZa/iLgpBAuzxSmNYhURZH+guITvSySk30YWfLYGBWQgeo 8NzNXBY3cH7JX3/a0jzmhDc0U61qFxVgrPqs1PQOjp7yRSFuDAnjtRqNvWkvlnRWLFq4+U5t yzYe4SFMjFb6Oc0xkQmaK2flmiJNnnxPttYwKBPd98WfXMmjwAv7QfwW+OL3VlTPADgzkcqj 53bfZ4VblAQrq6Ctbtu7JuUGAxSIL3XqeQlAwwLTfFGrmpY7MroE7n9Rl+hy/kuIrb/TO8n0 ZxYXvvhT7OmRKvbYuc5Jze6o7op/bJHlufY+AquYQ4dPxjPPVUT/DLiUYJ3oVBWFYNbzfOrV RxEwNuRbycttMiZWxgflsQoHF06q/2l4ttS3zsV4TDZudMq0TbCH/uJFPFsbHUN91qwwaN/+ gy1j7o6aWMz+Ib3O9dK2M/j/O/Ube95mdCqN4N/uSnDlca3YDEWrV9jO1mUS/ndOkjxa34ia 70FjwiSQAsyIwqbRO3CGmiOJqDa9qNvd2TJgAaS2WCw/TlBALjVQ7AyoPEoBPj31K74Wc4GS Rm+FSch32ei61yFu6ACdZ12i5Edt+To+hkElzjt6db/UgRUeKfzlMB7PodK7o8NBD8outJGS tsL2GRX24QvvBuusJdMiLGpNz3uqyqwzC5w0Fd34E6G94806fwARAQABzSJDw6lkcmljIExl IEdvYXRlciA8Y2xnQHJlZGhhdC5jb20+wsGRBBMBCAA7FiEEoPZlSPBIlev+awtgUaNDx8/7 7KEFAmTLlVECGwMFCwkIBwICIgIGFQoJCAsCBBYCAwECHgcCF4AACgkQUaNDx8/77KG0eg// S0zIzTcxkrwJ/9XgdcvVTnXLVF9V4/tZPfB7sCp8rpDCEseU6O0TkOVFoGWM39sEMiQBSvyY lHrP7p7E/JYQNNLh441MfaX8RJ5Ul3btluLapm8oHp/vbHKV2IhLcpNCfAqaQKdfk8yazYhh EdxTBlzxPcu+78uE5fF4wusmtutK0JG0sAgq0mHFZX7qKG6LIbdLdaQalZ8CCFMKUhLptW71 xe+aNrn7hScBoOj2kTDRgf9CE7svmjGToJzUxgeh9mIkxAxTu7XU+8lmL28j2L5uNuDOq9vl hM30OT+pfHmyPLtLK8+GXfFDxjea5hZLF+2yolE/ATQFt9AmOmXC+YayrcO2ZvdnKExZS1o8 VUKpZgRnkwMUUReaF/mTauRQGLuS4lDcI4DrARPyLGNbvYlpmJWnGRWCDguQ/LBPpbG7djoy k3NlvoeA757c4DgCzggViqLm0Bae320qEc6z9o0X0ePqSU2f7vcuWN49Uhox5kM5L86DzjEQ RHXndoJkeL8LmHx8DM+kx4aZt0zVfCHwmKTkSTQoAQakLpLte7tWXIio9ZKhUGPv/eHxXEoS 0rOOAZ6np1U/xNR82QbF9qr9TrTVI3GtVe7Vxmff+qoSAxJiZQCo5kt0YlWwti2fFI4xvkOi V7lyhOA3+/3oRKpZYQ86Frlo61HU3r6d9wzOwU0EW7yjdQEQALyDNNMw/08/fsyWEWjfqVhW pOOrX2h+z4q0lOHkjxi/FRIRLfXeZjFfNQNLSoL8j1y2rQOs1j1g+NV3K5hrZYYcMs0xhmrZ KXAHjjDx7FW3sG3jcGjFW5Xk4olTrZwFsZVUcP8XZlArLmkAX3UyrrXEWPSBJCXxDIW1hzwp bV/nVbo/K9XBptT/wPd+RPiOTIIRptjypGY+S23HYBDND3mtfTz/uY0Jytaio9GETj+fFis6 TxFjjbZNUxKpwftu/4RimZ7qL+uM1rG1lLWc9SPtFxRQ8uLvLOUFB1AqHixBcx7LIXSKZEFU CSLB2AE4wXQkJbApye48qnZ09zc929df5gU6hjgqV9Gk1rIfHxvTsYltA1jWalySEScmr0iS YBZjw8Nbd7SxeomAxzBv2l1Fk8fPzR7M616dtb3Z3HLjyvwAwxtfGD7VnvINPbzyibbe9c6g LxYCr23c2Ry0UfFXh6UKD83d5ybqnXrEJ5n/t1+TLGCYGzF2erVYGkQrReJe8Mld3iGVldB7 JhuAU1+d88NS3aBpNF6TbGXqlXGF6Yua6n1cOY2Yb4lO/mDKgjXd3aviqlwVlodC8AwI0Sdu jWryzL5/AGEU2sIDQCHuv1QgzmKwhE58d475KdVX/3Vt5I9kTXpvEpfW18TjlFkdHGESM/Jx IqVsqvhAJkalABEBAAHCwV8EGAECAAkFAlu8o3UCGwwACgkQUaNDx8/77KEhwg//WqVopd5k 8hQb9VVdk6RQOCTfo6wHhEqgjbXQGlaxKHoXywEQBi8eULbeMQf5l4+tHJWBxswQ93IHBQjK yKyNr4FXseUI5O20XVNYDJZUrhA4yn0e/Af0IX25d94HXQ5sMTWr1qlSK6Zu79lbH3R57w9j hQm9emQEp785ui3A5U2Lqp6nWYWXz0eUZ0Tad2zC71Gg9VazU9MXyWn749s0nXbVLcLS0yop s302Gf3ZmtgfXTX/W+M25hiVRRKCH88yr6it+OMJBUndQVAA/fE9hYom6t/zqA248j0QAV/p LHH3hSirE1mv+7jpQnhMvatrwUpeXrOiEw1nHzWCqOJUZ4SY+HmGFW0YirWV2mYKoaGO2YBU wYF7O9TI3GEEgRMBIRT98fHa0NPwtlTktVISl73LpgVscdW8yg9Gc82oe8FzU1uHjU8b10lU XOMHpqDDEV9//r4ZhkKZ9C4O+YZcTFu+mvAY3GlqivBNkmYsHYSlFsbxc37E1HpTEaSWsGfA HQoPn9qrDJgsgcbBVc1gkUT6hnxShKPp4PlsZVMNjvPAnr5TEBgHkk54HQRhhwcYv1T2QumQ izDiU6iOrUzBThaMhZO3i927SG2DwWDVzZltKrCMD1aMPvb3NU8FOYRhNmIFR3fcalYr+9gD uVKe8BVz4atMOoktmt0GWTOC8P4= In-Reply-To: <20240921071440.1915876-1-zhiw@nvidia.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=clg@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.131, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=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-bounces+qemu-devel=archiver.kernel.org@nongnu.org Hello Zhi, On 9/21/24 09:14, Zhi Wang wrote: > Compute Express Link (CXL) is an open standard interconnect built upon > industrial PCI layers to enhance the performance and efficiency of data > centers by enabling high-speed, low-latency communication between CPUs > and various types of devices such as accelerators, memory. > > Although CXL is built upon the PCI layers, passing a CXL type-2 device can > be different than PCI devices according to CXL specification. Thus, > addtional changes on are required. > > vfio-cxl is introduced to support the CXL type-2 device passthrough. > This is the QEMU VFIOStub draft changes to support it. > > More details (patches, repos, kernel config) all what you need to test > and hack around, plus a demo video shows the kernel/QEMU command line > can be found at: > https://lore.kernel.org/kvm/20240920223446.1908673-7-zhiw@nvidia.com/T/ I have started looking at the software stack and the QEMU trees are quite old. Could you please rebase the branches on the latest ? Also, I think having a single branch per project would be easier. For linux : [v2] cxl: add Type2 device support [RFC] vfio: introduce vfio-cxl to support CXL type-2 [RFC] samples: introduce QEMU CXL accel driver Same for QEMU. Thanks, C. > > Zhi Wang (1): > vfio: support CXL device in VFIO stub > > hw/vfio/common.c | 3 + > hw/vfio/pci.c | 134 ++++++++++++++++++++++++++++++++++ > hw/vfio/pci.h | 10 +++ > include/hw/pci/pci.h | 2 + > include/hw/vfio/vfio-common.h | 1 + > linux-headers/linux/vfio.h | 14 ++++ > 6 files changed, 164 insertions(+) >