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R. Silva" , "linux-kernel@vger.kernel.org" , "linux-cxl@vger.kernel.org" , "linux-hardening@vger.kernel.org" , Leon Romanovsky , "Jason Gunthorpe" , Alex Williamson , "pierre.cregut@orange.com" Subject: [PATCH v3 1/2] PCI/IOV: Revert "PCI/IOV: Serialize sysfs sriov_numvfs reads vs writes" Thread-Topic: [PATCH v3 1/2] PCI/IOV: Revert "PCI/IOV: Serialize sysfs sriov_numvfs reads vs writes" Thread-Index: AQHaX5l/Y5bHR2DvZ0+eeI1J9u0GaA== Date: Wed, 14 Feb 2024 22:59:42 +0000 Message-ID: <170795158249.2393.6069168125066679172.stgit@bgt-140510-bm01.eng.stellus.in> In-Reply-To: <170795147587.2393.15577527626926144858.stgit@bgt-140510-bm01.eng.stellus.in> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: Content-ID: <84A3C9C8FC63C94C827BCF517FA70757@ssi.samsung.com> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrJKsWRmVeSWpSXmKPExsWy7djX87oPXM+mGjz+yWnx7X8Pm8XdxxfY LKZPvcBoceJmI5vF6ptrGC1+XZzGarH/6XMWiyv/9jBarFp4jc3iTHeuxaYNT1gszs86xWIx b/1PRovLu+awWaz/+p7N4taEY0wOAh6zGy6yeLQcecvqsXjPSyaPTas62Tx6m9+xebQ8O8nm 8X7fVTaPqbPrPT5vkgvgjOKySUnNySxLLdK3S+DKaJqxh6Vgm0DF7cUN7A2MDQJdjJwcEgIm Ev2nd7F0MXJxCAmsZJS4fPAxlNPKJDF/8mQ2mKrNKydAJdYwSix9e58NwvnEKNF67AZUZhmj xN+fbxhBWtgENCV+XVnDBJIQEfjIKtG3Ywo7SEJYIFHi0LdbrCC2iECaxPreHhYIW0/i1/2l YM0sAqoS35r6wGp4BSIkdp76BRbnFIiS+P35BZjNKCAm8f0UyAJODmYBcYlbT+YzQdwqKLFo 9h5mCFtM4t+uh1A/KErc//4S6AYOoHpNifW79CFa7SQm3bnABmErSkzpfsgOsVZQ4uTMJywQ rZISB1fcgLJXc0p0H1aBsF0kLs1ayQhhS0v8vbsM6oRsiZXrO5hAVkkIFEg0HAmCCFtLLPyz HupiPom/vx4xTmBUnoXkgVkIx81CctwsJMfNQnLcAkbWVYzipcXFuempxcZ5qeV6xYm5xaV5 6XrJ+bmbGIGp8fS/wwU7GG/d+qh3iJGJg/EQowQHs5II76TeM6lCvCmJlVWpRfnxRaU5qcWH GKU5WJTEeQ1tTyYLCaQnlqRmp6YWpBbBZJk4OKUamBp89hreC+ZIWH4y1NzuVtW3oyKBujOj VF69Xskq4vvtWTufmFR6wCrLEE736UeNHm68/Leg79uVv6+atS88FJ7NcU2467wuu+7yp+ud trl+yzmcP5/t+sWdRounzw7OnXfxU6oLT2JjTVfQ9s5fJ40Sru5QqO3MdjvDbRReszg+6Ero 4gkBkQten76436/CyMwmsMezY85m76hYLfZ7n3XD/Xtk8+bmHtUXCrxwjeHbrhsrFySu7/9X FvCvNOn5Aq2/S4PeM17ZU9mz4/21iTNuRcyTnq3ufOJjqfSRWfcKsz7+nZb1M3itsN31ozKT xasMLv62PSZaHDHPaNqSxubKu6/UXO3C+t+GzLstsEuJpTgj0VCLuag4EQCTTbim/AMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA02Se0hTYRjG+XbOjsfR8mtafi2QGnQxSLtRH2QShXGC1G6kGVEjT9NypjtO K7rMC0aXxRTndJbLsqglaMssbRVTy0ulRpblNA1nTcIsLcsZmvMU+d/ve5/3ed7nj48mJKOk lI6NT2JV8fI4GSUiYzXE+iVdIS/Ypb8s/nh4/DyFO3taKGzQtwBc/y6VwrfelQDsepkrxI97 P5G4dcwKsLnoDYWfn1NiS5mDxM3GRhIXlo4A/KrqIoVLfwxQuF33VLAOMgWalySTUdsvZK5a +wSMxXyGYrTpXygm42MDxQw8ek0x+oJTzJDFb4tnlCgomo2LTWZVgcH7RDFpeVYyoQIesV/V eGiABp4FnjSCK9GdmzryLBDREmgG6N5vi4B/DALkGO/+q1wHKNdm8HBbKOiPXK0lk1s+8JsQ DXXrJwVvKEdaQ63AzT7wACrVnid5DkCurmvAzSScj4bTLgjdLIaRqLLRNTGnJy7sQrq2JPfY E0ah0SHn5DqAs9DPxpLJSAL6onaHScDXhqjY2kzwPBP19YwJeZ6Hun72ebgjiYmepVWBvDUY ZXe0UDzPQznnPnjwDWaghnwHyVtnI9uNt6QO+BqnXDP+TzJOSTJOSTJOSboMhGbgq+Y4peII tzyeTQng5EpOHa8I2H9YaQET/+PZWM3u+8De/i2gGghoUA0QTch8xNna56xEHC0/eoxVHd6r UsexXDWYQ5MyX3Fn9yJWAhXyJPYQyyawqn+qgPaUagSrDaZcvwjTgAomZ9qcm6TNpuCycOvn K9kiadHn9qaYus2XfqH09LvRI6GSjsf5tbO5zDQdQSt2yZ7FnihuXiPcFvJBvGFRXOV0KUgp rG+ojbQ1zNp+Kef019bGrMvKCLF9Ey0ThTrrF/qZThlGVuC8GrV/mD61TWlpWrAjTIiZ+akV q7Tvd/annJ5W931r75or906aiwtW3tl4ZnC3s3AwMfFVLqpQv+6vr5AQYu+UtgVeMtLVUZ7A 7omwN4mCJHnbHxRFMsezjFu8uqwvbJu33aZ7l3uVrw46mpisfNP5RD8t1DXXKcl6WLk02Xmx hwzvPvhW4dhnX4tD+tZXyUguRr5sMaHi5H8Ami8tP44DAAA= X-CMS-MailID: 20240214225943uscas1p21ffa8b362bac11379168b83e42159160 CMS-TYPE: 301P X-CMS-RootMailID: 20240214225943uscas1p21ffa8b362bac11379168b83e42159160 References: <170795147587.2393.15577527626926144858.stgit@bgt-140510-bm01.eng.stellus.in> If an SR-IOV enabled device is held by vfio, and the device is removed, vfio will hold device lock and notify userspace of the removal. If userspace reads the sriov_numvfs sysfs entry, that thread will be blocked since sriov_numvfs_show() also tries to acquire the device lock. If that same thread is responsible for releasing the device to vfio, it results in a deadlock. The proper way to detect a change to the num_VFs value is to listen for a sysfs event, not to add a device_lock() on the attribute _show() in the kernel. This reverts commit 35ff867b76576e32f34c698ccd11343f7d616204. Revert had a small conflict, the sprintf() is now changed to sysfs_emit(). Link: https://lore.kernel.org/linux-pci/ZXJI5+f8bUelVXqu@ubuntu/ Suggested-by: Leon Romanovsky Reviewed-by: Leon Romanovsky Signed-off-by: Jim Harris --- drivers/pci/iov.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index aaa33e8dc4c9..0ca20cd518d5 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -395,14 +395,8 @@ static ssize_t sriov_numvfs_show(struct device *dev, char *buf) { struct pci_dev *pdev = to_pci_dev(dev); - u16 num_vfs; - - /* Serialize vs sriov_numvfs_store() so readers see valid num_VFs */ - device_lock(&pdev->dev); - num_vfs = pdev->sriov->num_VFs; - device_unlock(&pdev->dev); - return sysfs_emit(buf, "%u\n", num_vfs); + return sysfs_emit(buf, "%u\n", pdev->sriov->num_VFs); } /* From patchwork Wed Feb 14 22:59:48 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jim Harris X-Patchwork-Id: 13557168 Received: from mailout1.w2.samsung.com (mailout1.w2.samsung.com [211.189.100.11]) (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 BCEE51419AC; Wed, 14 Feb 2024 22:59:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=211.189.100.11 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707951592; cv=none; b=Ya+HvEuEisG5v6M1h1f2PAF3pOCkfcP/qSXlY4JJ4iu2CWb4DEcgPbUKU8WbXsR2bds3dnB/OxGQ3IgybbT5KTtROK08Yzhqfh6lpXRiEPTNt6qE1z7ejMrpUGswP4ELogxOBd14BvqinyqvhOmPJcLmTYlVCjF+JksgqREukbA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707951592; c=relaxed/simple; bh=4dqGokGdhy1xJ0FLPp2+hNGb5PkT3Xrir0Am1s+UV3I=; h=From:To:Subject:Date:Message-ID:In-Reply-To:Content-Type: MIME-Version:References; b=UPgkJmkea5n+UKg+d48navn3tV/7ssfAM8aXzawZmiYchHbSEv0wDQ0Cm5BN/kp7F7sPaqKW1pSBuCTWqwK9QhBdpiRfZo72dPzUlrgdPQpAsk3hkz3PO8BkcjCjwRC1iiD7AT+xU6AYBqmvjbH2Qgx+RaftF6x9RFAOoqZnlS4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=samsung.com; spf=pass smtp.mailfrom=samsung.com; dkim=pass (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b=MlBIxBfa; arc=none smtp.client-ip=211.189.100.11 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=samsung.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=samsung.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b="MlBIxBfa" Received: from uscas1p1.samsung.com (unknown [182.198.245.206]) by mailout1.w2.samsung.com (KnoxPortal) with ESMTP id 20240214225949usoutp01fcfef7c201676a007d1e4b6877c0a57a~z3OvmfP7g0141401414usoutp01K; Wed, 14 Feb 2024 22:59:49 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 mailout1.w2.samsung.com 20240214225949usoutp01fcfef7c201676a007d1e4b6877c0a57a~z3OvmfP7g0141401414usoutp01K DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=samsung.com; s=mail20170921; t=1707951589; bh=4dqGokGdhy1xJ0FLPp2+hNGb5PkT3Xrir0Am1s+UV3I=; h=From:To:Subject:Date:In-Reply-To:References:From; b=MlBIxBfahZgK8Vvj+fgWVrQgbowiV7gdsp9P5RLN5YkHryju3JRakvPbp673MLVbQ hBS1FvTEZbf5Sol4CH74/+ZyoX5FXt9y0BRR73K24MNfh3Hj7sWlI/00MQNY9t315S bYa1F6vv8HK50BDac6vflnK7RjE/NXEslDyqGL44= Received: from ussmges3new.samsung.com (u112.gpu85.samsung.co.kr [203.254.195.112]) by uscas1p2.samsung.com (KnoxPortal) with ESMTP id 20240214225949uscas1p2c39aa3d52cbd2300706548d583e6a2a8~z3Ovanry53221832218uscas1p2I; Wed, 14 Feb 2024 22:59:49 +0000 (GMT) Received: from uscas1p2.samsung.com ( [182.198.245.207]) by ussmges3new.samsung.com (USCPEMTA) with SMTP id FB.B6.09550.5E54DC56; Wed, 14 Feb 2024 17:59:49 -0500 (EST) Received: from ussmgxs1new.samsung.com (u89.gpu85.samsung.co.kr [203.254.195.89]) by uscas1p2.samsung.com (KnoxPortal) with ESMTP id 20240214225948uscas1p2178d37968dc620a7e317ce3b0d57ab04~z3Ou_2Y9N2193821938uscas1p2r; Wed, 14 Feb 2024 22:59:48 +0000 (GMT) X-AuditID: cbfec370-933ff7000000254e-41-65cd45e5dcbd Received: from SSI-EX1.ssi.samsung.com ( [105.128.3.67]) by ussmgxs1new.samsung.com (USCPEXMTA) with SMTP id 44.F3.50167.4E54DC56; Wed, 14 Feb 2024 17:59:48 -0500 (EST) Received: from SSI-EX2.ssi.samsung.com (105.128.2.227) by SSI-EX1.ssi.samsung.com (105.128.2.226) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.1.2375.24; Wed, 14 Feb 2024 14:59:48 -0800 Received: from SSI-EX2.ssi.samsung.com ([105.128.2.227]) by SSI-EX2.ssi.samsung.com ([105.128.2.227]) with mapi id 15.01.2375.024; Wed, 14 Feb 2024 14:59:48 -0800 From: Jim Harris To: Davidlohr Bueso , Jonathan Cameron , Dave Jiang , "Alison Schofield" , Vishal Verma , Ira Weiny , Dan Williams , Kees Cook , "Gustavo A. R. Silva" , "linux-kernel@vger.kernel.org" , "linux-cxl@vger.kernel.org" , "linux-hardening@vger.kernel.org" , Leon Romanovsky , "Jason Gunthorpe" , Alex Williamson , "pierre.cregut@orange.com" Subject: [PATCH v3 2/2] PCI/IOV: set iov->num_VFs before VFs are probed Thread-Topic: [PATCH v3 2/2] PCI/IOV: set iov->num_VFs before VFs are probed Thread-Index: AQHaX5mCLK4WlF8EHEe3pPHlJMI8cA== Date: Wed, 14 Feb 2024 22:59:48 +0000 Message-ID: <170795158776.2393.11628830004240634947.stgit@bgt-140510-bm01.eng.stellus.in> In-Reply-To: <170795147587.2393.15577527626926144858.stgit@bgt-140510-bm01.eng.stellus.in> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: Content-ID: <055EBCC164A1E949ACB3DD83D73DCBF2@ssi.samsung.com> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrJKsWRmVeSWpSXmKPExsWy7djX87pPXc+mGmxZy27x7X8Pm8XdxxfY LKZPvcBoceJmI5vF6ptrGC1+XZzGarH/6XMWiyv/9jBarFp4jc3iTHeuxaYNT1gszs86xWIx b/1PRovLu+awWaz/+p7N4taEY0wOAh6zGy6yeLQcecvqsXjPSyaPTas62Tx6m9+xebQ8O8nm 8X7fVTaPqbPrPT5vkgvgjOKySUnNySxLLdK3S+DKePS9gb1gC0fFg5e7WRoYZ3B0MXJySAiY SFzb/4O9i5GLQ0hgJaNE4+5ORginlUliw5HbzDBV9ze8ZoVIrGGUOPZgGxtIQkjgE6PEjwNm EIlljBIPF09nAkmwCWhK/LqyhgkkISLwkVWib8cUdpCEsIC7xLsJS1lBbBEBH4n/904yQdh6 Ev0zN4NNZRFQlfh2AqKGVyBS4sPzhWBncApESfz+/IIRxGYUEJP4fmoNWC+zgLjErSfzmSBO FZRYNHsP1NliEv92PWSDsBUl7n9/CXQDB1C9psT6XfoQrXYSxw8dgBqjKDGl+yE7xFpBiZMz n7BAtEpKHFxxgwXkFwmB9ZwSpxdNgJrvIrH072OovdISV69PhYpnS6xc38EEsktCoECi4UgQ RNhaYuGf9VC7+CT+/nrEOIFReRaSD2YhXDcLyXWzkFw3C8l1CxhZVzGKlxYX56anFhvnpZbr FSfmFpfmpesl5+duYgSmxtP/DhfsYLx166PeIUYmDsZDjBIczEoivJN6z6QK8aYkVlalFuXH F5XmpBYfYpTmYFES5zW0PZksJJCeWJKanZpakFoEk2Xi4JRqYLJ99ezBstcOy1oXLY9Icc4W kv9irslXOaN0LheD/I7q3UZ1R0IYMyVde/u/dS75NWeZXMfDK+veuYX/vXYxOTJBLLCGY8d3 r5+GDHmNblbyv38lnn7nfv2s6JN/q4r25zz9cODiz9X/b8Q8eZveZc0xb25HgrU416+35+qf H/2v0fX6jLmn4Ytmm9UXdt8R3ih3qcPut64PZ7XdxpWhdy7tElny49shzassv/czvWBrSzxS 7a9zyOr/8RCB/e8FtnjsWrS5S8Noe+6rrad7NrL8fTWjJtytuqK9ZF7bdgOXU5f4lSZ+i0gS +BLaXSez/IfJiTNPrSQEqr+xckmeyXm24JBRWbP+xbKfGh36DRpKLMUZiYZazEXFiQDHa8Vz /AMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrFIsWRmVeSWpSXmKPExsWS2cDsrPvE9WyqwcN3Ghbf/vewWdx9fIHN YvrUC4wWJ242slmsvrmG0eLXxWmsFvufPmexuPJvD6PFqoXX2CzOdOdabNrwhMXi/KxTLBbz 1v9ktLi8aw6bxfqv79ksbk04xuQg4DG74SKLR8uRt6wei/e8ZPLYtKqTzaO3+R2bR8uzk2we 7/ddZfOYOrve4/MmuQDOKC6blNSczLLUIn27BK6MR98b2Au2cFQ8eLmbpYFxBkcXIyeHhICJ xP0Nr1m7GLk4hARWMUp0LNvPCOF8YpRY/P8rG0iVkMAyRom1jW4gNpuApsSvK2uYQIpEBD6y Snx+MJUdJCEs4C7xbsJSVhBbRMBH4v+9k0wQtp5E/8zNYINYBFQlvp2AqOEViJT48Hwhcxcj B9CCSIkJ10tAwpwCURK/P79gBLEZBcQkvp9aAzaGWUBc4taT+UwQVwtILNlznhnCFpV4+fgf K4StKHH/+0t2kJHMQHeu36UP0WoncfzQAagxihJTuh+yQ1wgKHFy5hMWiFZJiYMrbrBMYBSf hWTbLIRJs5BMmoVk0iwkkxYwsq5iFC8tLs5Nryg2zEst1ytOzC0uzUvXS87P3cQITB6n/x2O 3MF49NZHvUOMTByMhxglOJiVRHgn9Z5JFeJNSaysSi3Kjy8qzUktPsQozcGiJM5794FGqpBA emJJanZqakFqEUyWiYNTqoEp/5hHuALDXtYrHie3lKStF7J+r1VuqHQ2W+Hua6uWKzvjXCfK K/A3LCpP8Who+iJf4P7zTcXLthmm0pcFN7zZlNymf6qo5UFb4u6F66QmHt3S0640e3UT67L9 L35tu5byo4b9mmJs+4Jmn0pzdtNyX1HvxFNmRxar/3m2c4Ln4ZMGM9/lF63ab9BwZLLC1Wdi 2x9KsrAWvlofoet3Rq/8xIGk9oXKl04bFVdPvCskrLTcuOT925Azv6dP/+B4o8LxocR+scPV q7abvTrs9SrII5tL7v+bk9yhdoeipgWedrvY+jPTT2r60Ze/zJiz2Y78WV3Gufd84fJ3Lwx1 fvLLzVI7xnHf/qnNUisN1khdJZbijERDLeai4kQApJE7vI0DAAA= X-CMS-MailID: 20240214225948uscas1p2178d37968dc620a7e317ce3b0d57ab04 CMS-TYPE: 301P X-CMS-RootMailID: 20240214225948uscas1p2178d37968dc620a7e317ce3b0d57ab04 References: <170795147587.2393.15577527626926144858.stgit@bgt-140510-bm01.eng.stellus.in> Ensure userspace can see the updated number of VFs via sysfs sriov_numvfs before those VFs are probed. Suggested-by: Leon Romanovsky Signed-off-by: Jim Harris --- drivers/pci/iov.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index 0ca20cd518d5..ebb7c6892ad6 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -673,12 +673,14 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn) msleep(100); pci_cfg_access_unlock(dev); + iov->num_VFs = nr_virtfn; rc = sriov_add_vfs(dev, initial); - if (rc) + if (rc) { + iov->num_VFs = 0; goto err_pcibios; + } kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE); - iov->num_VFs = nr_virtfn; return 0;