From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (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 5B3EF12B94; Tue, 14 Oct 2025 14:21:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.158.5 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760451701; cv=none; b=OrGraQq6fENduQL6wn4q3ZVqCBbieD87eNdJMwHNB3gvVb9VqSVyumGJ62bzgvWmMoiv5280lK+6/O3mv8DWVucyyvGPibCp2gh/+1NIQgNANSLz6E5qcYWi2g8pzn+nadxwzmh3soklmESu6nnvxk4bci7QqRE029C3F/nhq3w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760451701; c=relaxed/simple; bh=UqzsvwMp3V0i7PDSlVhWanfYCUH2uWNbSf0hNoLES9Q=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=lEz7N02rAwNMA0eLxX83OiBxTMFESDCEnEZ1s1kHJNpq9lgWbMVfXh2UKt3suxThBC/aCh8uz6zOxeosUrB6OHVmzmWuRGD9lvGDT+jsQE0B6bibF6x6u2Py4YsIZ4y/Ee6s4N6HWUhGJf62UQMrV1X07MGIYukdFFd0IEReZSU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; spf=pass smtp.mailfrom=linux.ibm.com; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b=e+iErGsK; arc=none smtp.client-ip=148.163.158.5 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="e+iErGsK" Received: from pps.filterd (m0353725.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 59EB7WPm015294; Tue, 14 Oct 2025 14:20:54 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=pp1; bh=2EBKHt oFBxc6VeU5knOorwmqOfQ2r5EFkZDTHtXao5E=; b=e+iErGsKOcPSWwqu9PWl+V fkDZNS6kdV7P2KCoLq1fa7FBu0rykqEZgBU+rOfEoQHCPSO4ZzAP8Zz900qrEQps tkOQzIVN5/KI1gfTqOdHd3M2zoH1vf7mXU8vpYmq1iaemnW78g7AlLmcp9GTlyYc yjqv1WmnHnxmQClIlgK/XYpB4D5H0y/juE2t8gq1crr96GS8HgmbyhykU7ddEoNs 9+ut4mXXV7h37EzEaFNYEEBARSVYr7Gd9axEWeJR2Uike+Qdu91Qg8SHfxKri2/f UVY8jSF0EEcuOm4sdu5HQv4d2f6DYvu97LE3nnPTj2P0qWuoSD7EUBq4btwwdsmg == Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 49qdnperrq-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 14 Oct 2025 14:20:54 +0000 (GMT) Received: from m0353725.ppops.net (m0353725.ppops.net [127.0.0.1]) by pps.reinject (8.18.1.12/8.18.0.8) with ESMTP id 59EDwQXc002823; Tue, 14 Oct 2025 14:20:53 GMT Received: from ppma13.dal12v.mail.ibm.com (dd.9e.1632.ip4.static.sl-reverse.com [50.22.158.221]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 49qdnperrk-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 14 Oct 2025 14:20:53 +0000 (GMT) Received: from pps.filterd (ppma13.dal12v.mail.ibm.com [127.0.0.1]) by ppma13.dal12v.mail.ibm.com (8.18.1.2/8.18.1.2) with ESMTP id 59ECK0J5015016; Tue, 14 Oct 2025 14:20:52 GMT Received: from smtprelay02.dal12v.mail.ibm.com ([172.16.1.4]) by ppma13.dal12v.mail.ibm.com (PPS) with ESMTPS id 49r3sjb467-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 14 Oct 2025 14:20:52 +0000 Received: from smtpav04.wdc07v.mail.ibm.com (smtpav04.wdc07v.mail.ibm.com [10.39.53.231]) by smtprelay02.dal12v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 59EEKput32637650 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 14 Oct 2025 14:20:52 GMT Received: from smtpav04.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CD13F58045; Tue, 14 Oct 2025 14:20:51 +0000 (GMT) Received: from smtpav04.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8B33958050; Tue, 14 Oct 2025 14:20:45 +0000 (GMT) Received: from [9.152.212.179] (unknown [9.152.212.179]) by smtpav04.wdc07v.mail.ibm.com (Postfix) with ESMTP; Tue, 14 Oct 2025 14:20:45 +0000 (GMT) Message-ID: <21f4afb4069489729cf90469abf2d1321ed17bec.camel@linux.ibm.com> Subject: Re: [PATCH v1 02/20] iommu: Introduce a test_dev domain op and an internal helper From: Niklas Schnelle To: Nicolin Chen Cc: joro@8bytes.org, jgg@nvidia.com, kevin.tian@intel.com, suravee.suthikulpanit@amd.com, will@kernel.org, robin.murphy@arm.com, sven@kernel.org, j@jannau.net, jean-philippe@linaro.org, robin.clark@oss.qualcomm.com, dwmw2@infradead.org, baolu.lu@linux.intel.com, yong.wu@mediatek.com, matthias.bgg@gmail.com, angelogioacchino.delregno@collabora.com, tjeznach@rivosinc.com, pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, heiko@sntech.de, mjrosato@linux.ibm.com, wens@csie.org, jernej.skrabec@gmail.com, samuel@sholland.org, thierry.reding@gmail.com, jonathanh@nvidia.com, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-riscv@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-s390@vger.kernel.org, linux-sunxi@lists.linux.dev, linux-tegra@vger.kernel.org, virtualization@lists.linux.dev, patches@lists.linux.dev Date: Tue, 14 Oct 2025 16:20:44 +0200 In-Reply-To: References: <32ce256a2ece5d63e99d5858f953586859818ffc.1760312725.git.nicolinc@nvidia.com> <5165448792268e184e508a9c76fa0ce382a4a389.camel@linux.ibm.com> Autocrypt: addr=schnelle@linux.ibm.com; prefer-encrypt=mutual; keydata=mQINBGHm3M8BEAC+MIQkfoPIAKdjjk84OSQ8erd2OICj98+GdhMQpIjHXn/RJdCZLa58k /ay5x0xIHkWzx1JJOm4Lki7WEzRbYDexQEJP0xUia0U+4Yg7PJL4Dg/W4Ho28dRBROoJjgJSLSHwc 3/1pjpNlSaX/qg3ZM8+/EiSGc7uEPklLYu3gRGxcWV/944HdUyLcnjrZwCn2+gg9ncVJjsimS0ro/ 2wU2RPE4ju6NMBn5Go26sAj1owdYQQv9t0d71CmZS9Bh+2+cLjC7HvyTHKFxVGOznUL+j1a45VrVS XQ+nhTVjvgvXR84z10bOvLiwxJZ/00pwNi7uCdSYnZFLQ4S/JGMs4lhOiCGJhJ/9FR7JVw/1t1G9a UlqVp23AXwzbcoV2fxyE/CsVpHcyOWGDahGLcH7QeitN6cjltf9ymw2spBzpRnfFn80nVxgSYVG1d w75ksBAuQ/3e+oTQk4GAa2ShoNVsvR9GYn7rnsDN5pVILDhdPO3J2PGIXa5ipQnvwb3EHvPXyzakY tK50fBUPKk3XnkRwRYEbbPEB7YT+ccF/HioCryqDPWUivXF8qf6Jw5T1mhwukUV1i+QyJzJxGPh19 /N2/GK7/yS5wrt0Lwxzevc5g+jX8RyjzywOZGHTVu9KIQiG8Pqx33UxZvykjaqTMjo7kaAdGEkrHZ dVHqoPZwhCsgQARAQABtChOaWtsYXMgU2NobmVsbGUgPHNjaG5lbGxlQGxpbnV4LmlibS5jb20+iQ JXBBMBCABBAhsBBQsJCAcCBhUKCQgLAgQWAgMBAh4BAheAAhkBFiEEnbAAstJ1IDCl9y3cr+Q/Fej CYJAFAmesutgFCQenEYkACgkQr+Q/FejCYJDIzA//W5h3t+anRaztihE8ID1c6ifS7lNUtXr0wEKx Qm6EpDQKqFNP+n3R4A5w4gFqKv2JpYQ6UJAAlaXIRTeT/9XdqxQlHlA20QWI7yrJmoYaF74ZI9s/C 8aAxEzQZ64NjHrmrZ/N9q8JCTlyhk5ZEV1Py12I2UH7moLFgBFZsPlPWAjK2NO/ns5UJREAJ04pR9 XQFSBm55gsqkPp028cdoFUD+IajGtW7jMIsx/AZfYMZAd30LfmSIpaPAi9EzgxWz5habO1ZM2++9e W6tSJ7KHO0ZkWkwLKicrqpPvA928eNPxYtjkLB2XipdVltw5ydH9SLq0Oftsc4+wDR8TqhmaUi8qD Fa2I/0NGwIF8hjwSZXtgJQqOTdQA5/6voIPheQIi0NBfUr0MwboUIVZp7Nm3w0QF9SSyTISrYJH6X qLp17NwnGQ9KJSlDYCMCBJ+JGVmlcMqzosnLli6JszAcRmZ1+sd/f/k47Fxy1i6o14z9Aexhq/UgI 5InZ4NUYhf5pWflV41KNupkS281NhBEpChoukw25iZk0AsrukpJ74x69MJQQO+/7PpMXFkt0Pexds XQrtsXYxLDQk8mgjlgsvWl0xlk7k7rddN1+O/alcv0yBOdvlruirtnxDhbjBqYNl8PCbfVwJZnyQ4 SAX2S9XiGeNtWfZ5s2qGReyAcd2nBna0KU5pa2xhcyBTY2huZWxsZSA8bmlrbGFzLnNjaG5lbGxlQ GlibS5jb20+iQJUBBMBCAA+AhsBBQsJCAcCBhUKCQgLAgQWAgMBAh4BAheAFiEEnbAAstJ1IDCl9y 3cr+Q/FejCYJAFAmesuuEFCQenEYkACgkQr+Q/FejCYJCosA/9GCtbN8lLQkW71n/CHR58BAA5ct1 KRYiZNPnNNAiAzjvSb0ezuRVt9H0bk/tnj6pPj0zdyU2bUj9Ok3lgocWhsF2WieWbG4dox5/L1K28 qRf3p+vdPfu7fKkA1yLE5GXffYG3OJnqR7OZmxTnoutj81u/tXO95JBuCSJn5oc5xMQvUUFzLQSbh prIWxcnzQa8AHJ+7nAbSiIft/+64EyEhFqncksmzI5jiJ5edABiriV7bcNkK2d8KviUPWKQzVlQ3p LjRJcJJHUAFzsZlrsgsXyZLztAM7HpIA44yo+AVVmcOlmgPMUy+A9n+0GTAf9W3y36JYjTS+ZcfHU KP+y1TRGRzPrFgDKWXtsl1N7sR4tRXrEuNhbsCJJMvcFgHsfni/f4pilabXO1c5Pf8fiXndCz04V8 ngKuz0aG4EdLQGwZ2MFnZdyf3QbG3vjvx7XDlrdzH0wUgExhd2fHQ2EegnNS4gNHjq82uLPU0hfcr obuI1D74nV0BPDtr7PKd2ryb3JgjUHKRKwok6IvlF2ZHMMXDxYoEvWlDpM1Y7g81NcKoY0BQ3ClXi a7vCaqAAuyD0zeFVGcWkfvxYKGqpj8qaI/mA8G5iRMTWUUUROy7rKJp/y2ioINrCul4NUJUujfx4k 7wFU11/YNAzRhQG4MwoO5e+VY66XnAd+XPyBIlvy0K05pa2xhcyBTY2huZWxsZSA8bmlrbGFzLnNj aG5lbGxlQGdtYWlsLmNvbT6JAlQEEwEIAD4CGwEFCwkIBwIGFQoJCAsCBBYCAwECHgECF4AWIQSds ACy0nUgMKX3Ldyv5D8V6MJgkAUCZ6y64QUJB6cRiQAKCRCv5D8V6MJgkEr/D/9iaYSYYwlmTJELv+ +EjsIxXtneKYpjXEgNnPwpKEXNIpuU/9dcVDcJ10MfvWBPi3sFbIzO9ETIRyZSgrjQxCGSIhlbom4 D8jVzTA698tl9id0FJKAi6T0AnBF7CxyqofPUzAEMSj9ynEJI/Qu8pHWkVp97FdJcbsho6HNMthBl +Qgj9l7/Gm1UW3ZPvGYgU75uB/mkaYtEv0vYrSZ+7fC2Sr/O5SM2SrNk+uInnkMBahVzCHcoAI+6O Enbag+hHIeFbqVuUJquziiB/J4Z2yT/3Ps/xrWAvDvDgdAEr7Kn697LLMRWBhGbdsxdHZ4ReAhc8M 8DOcSWX7UwjzUYq7pFFil1KPhIkHctpHj2Wvdnt+u1F9fN4e3C6lckUGfTVd7faZ2uDoCCkJAgpWR 10V1Q1Cgl09VVaoi6LcGFPnLZfmPrGYiDhM4gyDDQJvTmkB+eMEH8u8V1X30nCFP2dVvOpevmV5Uk onTsTwIuiAkoTNW4+lRCFfJskuTOQqz1F8xVae8KaLrUt2524anQ9x0fauJkl3XdsVcNt2wYTAQ/V nKUNgSuQozzfXLf+cOEbV+FBso/1qtXNdmAuHe76ptwjEfBhfg8L+9gMUthoCR94V0y2+GEzR5nlD 5kfu8ivV/gZvij+Xq3KijIxnOF6pd0QzliKadaFNgGw4FoUeZo0rQhTmlrbGFzIFNjaG5lbGxlIDx uaWtzQGtlcm5lbC5vcmc+iQJUBBMBCAA+AhsBBQsJCAcCBhUKCQgLAgQWAgMBAh4BAheAFiEEnbAA stJ1IDCl9y3cr+Q/FejCYJAFAmesuuEFCQenEYkACgkQr+Q/FejCYJC6yxAAiQQ5NAbWYKpkxxjP/ AajXheMUW8EtK7EMJEKxyemj40laEs0wz9owu8ZDfQl4SPqjjtcRzUW6vE6JvfEiyCLd8gUFXIDMS l2hzuNot3sEMlER9kyVIvemtV9r8Sw1NHvvCjxOMReBmrtg9ooeboFL6rUqbXHW+yb4GK+1z7dy+Q 9DMlkOmwHFDzqvsP7eGJN0xD8MGJmf0L5LkR9LBc+jR78L+2ZpKA6P4jL53rL8zO2mtNQkoUO+4J6 0YTknHtZrqX3SitKEmXE2Is0Efz8JaDRW41M43cE9b+VJnNXYCKFzjiqt/rnqrhLIYuoWCNzSJ49W vt4hxfqh/v2OUcQCIzuzcvHvASmt049ZyGmLvEz/+7vF/Y2080nOuzE2lcxXF1Qr0gAuI+wGoN4gG lSQz9pBrxISX9jQyt3ztXHmH7EHr1B5oPus3l/zkc2Ajf5bQ0SE7XMlo7Pl0Xa1mi6BX6I98CuvPK SA1sQPmo+1dQYCWmdQ+OIovHP9Nx8NP1RB2eELP5MoEW9eBXoiVQTsS6g6OD3rH7xIRxRmuu42Z5e 0EtzF51BjzRPWrKSq/mXIbl5nVW/wD+nJ7U7elW9BoJQVky03G0DhEF6fMJs08DGG3XoKw/CpGtMe 2V1z/FRotP5Fkf5VD3IQGtkxSnO/awtxjlhytigylgrZ4wDpSE= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (3.56.2-2.fc42) Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDExMDAwNSBTYWx0ZWRfXyPWIZGa5NMw1 5v70l2Ww8AWvh621mUnLUAYE/ED96Pe5OBNjx+T+yOpOYZKOVbv5c+zNL4MaaidGUUewI4h+RPc g0E1F3gK1wLubbLBdsog5mLrvfjitsIwvDRw75KLemF9SeNqT+G/Nuaa8d/vXw6iSbw2kh17CRZ 8lLEmCLHmxUaCudFgXf/K/0irflo7WFbZpZ1QUigJlnLverbUXD5o/E7tnTxrPgEkC6C4OywGtj PQuPcCwTBFc+7x9EPB4tqKNkif80ZpbnF//ZeD1HHYGjalO0z/Y1T7BbNR53Vqzy3t2rP0aEixa DKgQERlLbCZoUhlBsi6Ruc63AXeG3F/UsYACHqqLTA9xlaPB1vkKXEQtm6PhTC8grABEzCx0x+p Z81k8ypovNnBaN/uwtOLeHGJBdtXyQ== X-Proofpoint-ORIG-GUID: 8Tn8OuynM52x8dQ7re618PDx0uY-TkIk X-Proofpoint-GUID: r6fD6B6EQarBaIKpq995teTAJbSfnKM6 X-Authority-Analysis: v=2.4 cv=MoxfKmae c=1 sm=1 tr=0 ts=68ee5c46 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=IkcTkHD0fZMA:10 a=x6icFKpwvdMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=cyMajOFANgF3YnkSg8AA:9 a=QEXdDO2ut3YA:10 a=DXsff8QfwkrTrK3sU8N1:22 a=Z5ABNNGmrOfJ6cZ5bIyy:22 a=bWyr8ysk75zN3GCy5bjg:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-10-14_02,2025-10-13_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 spamscore=0 lowpriorityscore=0 suspectscore=0 phishscore=0 bulkscore=0 priorityscore=1501 malwarescore=0 clxscore=1015 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510020000 definitions=main-2510110005 On Mon, 2025-10-13 at 10:22 -0700, Nicolin Chen wrote: > Hi Niklas, >=20 > On Mon, Oct 13, 2025 at 11:53:55AM +0200, Niklas Schnelle wrote: > > On Sun, 2025-10-12 at 17:04 -0700, Nicolin Chen wrote: > > > Add a new test_dev domain op for driver to test the compatibility bet= ween > > > a domain and a device at the driver level, before calling into the ac= tual > > > attachment/replacement of a domain. Support pasid for set_dev_pasid c= all. > > >=20 > > > Move existing core-level compatibility tests to a helper function. In= voke > > > it prior to: > > > * __iommu_attach_device() or its wrapper __iommu_device_set_domain() > > > * __iommu_set_group_pasid() > >=20 > > Should this list also include iommu_deferred_attach()? The code does > > include it. >=20 > iommu_deferred_attach() invokes __iommu_attach_device(), so it is > already included in the list :) Ok makes sense, though it does list __iommu_device_set_domain() separately. Either way is fine for me. >=20 > > > /** > > > * struct iommu_domain_ops - domain specific operations > > > - * @attach_dev: attach an iommu domain to a device > > > + * @test_dev: Test compatibility prior to an @attach_dev or @set_dev= _pasid call. > > > + * A driver-level callback of this op should do a thoroug= h sanity, to > >=20 > > You're missing the word "check" above. >=20 > Ack. >=20 > > > + * make sure a device is compatible with the domain. So t= he following > > > + * @attach_dev and @set_dev_pasid functions would likely = succeed with > > > + * only one exception due to a temporary failure like out= of memory. > >=20 > > Nit: "=E2=80=A6 only one exception =E2=80=A6" / "=E2=80=A6 like out of = memory =E2=80=A6" this sounds a > > bit odd to me because on the one hand it's one exception but then also > > a group (temporary failures). > >=20 > > Maybe better: > > "=E2=80=A6 would likely succeed with only the exception of temporary fa= ilures > > like out of memory."? >=20 > Sure. I can do that. Fixing both parts, it would be: >=20 > * @test_dev: Test compatibility prior to an @attach_dev or @set_dev_pasi= d call. > * A driver callback of this op should do a thorough sanity ch= eck, to > * make sure a device is compatible with the domain, so the fo= llowing > * @attach_dev and @set_dev_pasid functions would likely succe= ed with > * only the exception of temporary failures like out of memory= . >=20 Sounds good, thanks!