From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 41B6333DEC5 for ; Wed, 17 Dec 2025 17:02:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765990923; cv=none; b=OCtheoyd46aExuDcj4hxHm6YE4OAvi5KGQxBjSI3sqlposf36hVeDaQN+4OWAmleTGiY7dLsccXoYPI6CReX//rdOe/y88I22GMNKwUYkUVjOnTLJxH2BNbSoZc7l/pM9yqjnEXjEsD3H3UW0q3zSmac7KOh+7ekmiscp/w9LRg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765990923; c=relaxed/simple; bh=2D02SqJKD+nsCsJr8M1rCApsCcKMVZUyPH+0iU3i6ZA=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=iDZaim+DpAimaZjqI835UGljVmQ1c0sb/Hqem2JCS0IuJrgR/0pX1gmN5fUdrXBvTuIElAWg1IGJ3WgBhjCcy9leh+aALeW4eCB9Yx2iTvUWSjJOptnO5eytlDP2pnTC4S2zKZafgqEo2P/9us/wQ+qBxEzhIBliqilIcXJ9c+4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=gGcOlAGJ; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b=KfWGWoVB; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="gGcOlAGJ"; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b="KfWGWoVB" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1765990918; 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=dD5nFNFh+CHq/nzULmKKE12yIQGGBSkgJsl56ofghHQ=; b=gGcOlAGJwHpEufnbC8FoBzTXbvnBg8tlEWLPOTIHb6Hwfi5bSnOk1R70vASPalhrH8ldbK PAtwreueK7tsZ1Ksr4z23xfFDX4mvg3tVR5og0muYsgZZQ0nLxfXWRtOVY7Q7AII3YjwJx i3kTXe14wekGY92+sjy7IPZ0tj+KJJw= Received: from mail-wr1-f72.google.com (mail-wr1-f72.google.com [209.85.221.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-302-a40UgiztMdGa5DZWQHSCFg-1; Wed, 17 Dec 2025 12:01:53 -0500 X-MC-Unique: a40UgiztMdGa5DZWQHSCFg-1 X-Mimecast-MFC-AGG-ID: a40UgiztMdGa5DZWQHSCFg_1765990912 Received: by mail-wr1-f72.google.com with SMTP id ffacd0b85a97d-42fb1c2c403so4787759f8f.3 for ; Wed, 17 Dec 2025 09:01:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=google; t=1765990911; x=1766595711; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:autocrypt:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:from:to:cc:subject:date:message-id:reply-to; bh=dD5nFNFh+CHq/nzULmKKE12yIQGGBSkgJsl56ofghHQ=; b=KfWGWoVB/l6mxGUtQdYJe6v0cGKG6MK4aIQ45f5K4IPOpgUkWjKS5X7i4dZgAg+fPi +QhOK3g56CelitpLkjJ4o77TeDMC9OoT5AExk9Iq3SL2XUAxZLCtB2xQbi2wPjVNZeFq VPA4UnXxe6s7uB4qiV2SUPoPIRmYgcJYTp1xS9NyHhI2ql0oyQRFxUEF6+QTETg0akif 5qTKrt7DywoVakjGzvhSFMpgLqiUacbdk1eX6loJbrfqhfFVTf74j872IUymPYcoO3On vKAi8kWiPDcPjT5oKxfuc+V+BC0Dl0wKz3s9zLGYJyTaxQILAF8UgHwTOLvrvLvivk6o xZpQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1765990911; x=1766595711; h=content-transfer-encoding:in-reply-to:autocrypt:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=dD5nFNFh+CHq/nzULmKKE12yIQGGBSkgJsl56ofghHQ=; b=ujLBtlcmK4qfL6Nd9kAN6NXDe/GOcb6qPMfqlE1ivF9rAEp8f+9+dnAvgqdb07nA+B qS9VIkEj5ANs8phDzsoIOsMmZML9YiqbWKkW10qP8O6U+OBIf8sAgLub1FCC76nLv8jo PCcf7m36koFp0Ky7YTqHdzk6mNNSIKVkB8bJ7KMc6JJBpPrauci2E6PoQo6L5uX+/YQ4 K/DV73ZNjbTDvTnOgfwh4gDDihbW4HeJW5kI1+7WEHUNdgwpnTa77jqGRWARa/8lCGY5 Id0Up9+XMvPiSHnPDRGOJI/4iw8X7ipiOtNiVuyVsqfa61NRQr6FfJVXsCy6MdGi5LCz mbpQ== X-Forwarded-Encrypted: i=1; AJvYcCWSI33kRLbB3+wxtI3apgKoH+2m9CJmH8C80PRdqhCfMsRiQ1kSXZn1KxJeRMVl5lyo7/eC/M7oJdc=@vger.kernel.org X-Gm-Message-State: AOJu0Yyc40TjIuv5GuY1RlW0R0VtcLQXg1dU2DgmPqj2E8/7JMZSlPDl tsH769/Ukz5HHzsS+4clKXZGGbd2xVW7ZJbJpWSSfm86gOrFqxNfF4rClidmoMvSEYJ7Gsd3DIC ZWPnkk2+ANEqluWffi9MR4ufGbv9eCxYcT5H8leP4CM91IUe21osNHPXJEEI9dQ== X-Gm-Gg: AY/fxX7Nu1nGN49akJhshXVY0bVB4Dt8+z7wNhT6cDw50l/Us7UuzBJ4p1DzsctDA8c hLd6YZSoDiDz8qqtwMDDNbygtFID7g+6+BtJnF9mTKx9+NSvfK489F0tFEJ3TdvfiInfPNPqX66 RjaaUFdVDBE5CLr8aV5kx0RH6ViS5V8R63jWm31Jxkm5XNVwUtEj4evnNWfE+0fmPbnoBl82N8/ aylOu0GYgo6RjmIBAU6jwDe+nHqF8d+qumKIUK/OjcjNkeLxQ2HHIWRFVOJUvht3nlO2gC8MA0L hYnGdcL4awt55+bmfPlat0bYE9E/LYC6uRDnj6qePsc2sL76FkdbbMyjy4ziQnYmVbnPHXUpL0h WZhbIJ701NGoSPVfMVlUDPVq5aoJYeUUKqorxxbuE75rr+IVG X-Received: by 2002:a5d:64e6:0:b0:430:f5c3:39fe with SMTP id ffacd0b85a97d-430f5c33c72mr16059993f8f.4.1765990911449; Wed, 17 Dec 2025 09:01:51 -0800 (PST) X-Google-Smtp-Source: AGHT+IH7naa2xfBN81UFldN7VJ60YMv46kr3qq+t2tP1xJU0lrdjUCzUiNloJ8sGrQh5v79JlM1s8w== X-Received: by 2002:a5d:64e6:0:b0:430:f5c3:39fe with SMTP id ffacd0b85a97d-430f5c33c72mr16059928f8f.4.1765990910912; Wed, 17 Dec 2025 09:01:50 -0800 (PST) Received: from ?IPV6:2a01:e0a:280:24f0:9db0:474c:ff43:9f5c? ([2a01:e0a:280:24f0:9db0:474c:ff43:9f5c]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43244949ba6sm34714f8f.19.2025.12.17.09.01.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 17 Dec 2025 09:01:50 -0800 (PST) Message-ID: <9d06837d-7aed-43ef-87c2-1ce4f921dff2@redhat.com> Date: Wed, 17 Dec 2025 18:01:48 +0100 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 00/11] vfio/pci: Allow MMIO regions to be exported through dma-buf To: Nicolin Chen , Leon Romanovsky Cc: Bjorn Helgaas , Logan Gunthorpe , Jens Axboe , Robin Murphy , Joerg Roedel , Will Deacon , Marek Szyprowski , Jason Gunthorpe , Andrew Morton , Jonathan Corbet , Sumit Semwal , =?UTF-8?Q?Christian_K=C3=B6nig?= , Alex Williamson , Kees Cook , "Gustavo A. R. Silva" , Ankit Agrawal , Yishai Hadas , Shameer Kolothum , Kevin Tian , Krishnakant Jaju , Matt Ochs , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, iommu@lists.linux.dev, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, kvm@vger.kernel.org, linux-hardening@vger.kernel.org, Vivek Kasireddy References: <20251102-dmabuf-vfio-v6-0-d773cff0db9f@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: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hello Nicolin, On 11/4/25 20:19, Nicolin Chen wrote: > On Sun, Nov 02, 2025 at 10:00:48AM +0200, Leon Romanovsky wrote: >> Changelog: >> v6: >> * Fixed wrong error check from pcim_p2pdma_init(). >> * Documented pcim_p2pdma_provider() function. >> * Improved commit messages. >> * Added VFIO DMA-BUF selftest. >> * Added __counted_by(nr_ranges) annotation to struct vfio_device_feature_dma_buf. >> * Fixed error unwind when dma_buf_fd() fails. >> * Document latest changes to p2pmem. >> * Removed EXPORT_SYMBOL_GPL from pci_p2pdma_map_type. >> * Moved DMA mapping logic to DMA-BUF. >> * Removed types patch to avoid dependencies between subsystems. >> * Moved vfio_pci_dma_buf_move() in err_undo block. >> * Added nvgrace patch. > > I have verified this v6 using Jason's iommufd dmabuf branch: > https://github.com/jgunthorpe/linux/commits/iommufd_dmabuf/ > > by drafting a QEMU patch on top of Shameer's vSMMU v5 series: > https://github.com/nicolinc/qemu/commits/wip/iommufd_dmabuf/ > > with that, I see GPU BAR memory be correctly fetched in the QEMU: > vfio_region_dmabuf Device 0009:01:00.0, region "0009:01:00.0 BAR 0", offset: 0x0, size: 0x1000000 > vfio_region_dmabuf Device 0009:01:00.0, region "0009:01:00.0 BAR 2", offset: 0x0, size: 0x44f00000 > vfio_region_dmabuf Device 0009:01:00.0, region "0009:01:00.0 BAR 4", offset: 0x0, size: 0x17a0000000 > > Tested-by: Nicolin Chen Do you plan to provide P2P support with IOMMUFD for QEMU ? Thanks, C.