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spf=pass smtp.mailfrom=arm.com; dmarc=pass action=none header.from=arm.com; dkim=pass header.d=arm.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=armh.onmicrosoft.com; s=selector2-armh-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=zzN44KkCJ3krwqY6/PWdHUONNqbR+L3AonRvJq6pmlA=; b=QaSmsqsg1FBeEcwbMf63DysKFVwibwxQiHpAhxK3h8LtB4PT72sO/ztiZ+oF3wOlpLNCo0QH4JBrE+0CPI6qtSIUPIE8gevHQscSll3scnP8D8k0rta4UvfomsxxEdFCFp0URlGpzAQ0IK0OS1WFS9x2YZQRfrRpqtbrR2gK/+o= From: Rahul Singh To: Stefano Stabellini CC: xen-devel , Julien Grall , Bertrand Marquis , "Volodymyr_Babchuk@epam.com" , "brian.woods@xilinx.com" Subject: Re: [PATCH v3 0/3] Generic SMMU Bindings Thread-Topic: [PATCH v3 0/3] Generic SMMU Bindings Thread-Index: AQHW9DbnaDtcsjSAAUiKSXHzYBU+iapFEnqAgAAbJICAAYoWgA== Date: Wed, 3 Feb 2021 17:14:45 +0000 Message-ID: <86C6469B-2E50-41A0-A667-73E1E37E5C32@arm.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: Authentication-Results-Original: kernel.org; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Feb 2021 17:15:02.6863 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 33071f18-173f-4df9-127b-08d8c8673e65 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: DB5EUR03FT018.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR08MB4302 Hello Stefano, > On 2 Feb 2021, at 5:44 pm, Stefano Stabellini wr= ote: >=20 > On Tue, 2 Feb 2021, Rahul Singh wrote: >> Hello Stefano, >>=20 >>> On 26 Jan 2021, at 10:58 pm, Stefano Stabellini wrote: >>>=20 >>> Hi all, >>>=20 >>> This series introduces support for the generic SMMU bindings to >>> xen/drivers/passthrough/arm/smmu.c. >>>=20 >>> The last version of the series was >>> https://marc.info/?l=3Dxen-devel&m=3D159539053406643 >>>=20 >>> I realize that it is late for 4.15 -- I think it is OK if this series >>> goes in afterwards. >>=20 >> I tested the series on the Juno board it is woking fine. =20 >> I found one issue in SMMU driver while testing this series that is not r= elated to this series but already existing issue in SMMU driver. >>=20 >> If there are more than one device behind SMMU and they share the same St= ream-Id, SMMU driver is creating the new SMR entry without checking the alr= eady configured SMR entry if SMR entry correspond to stream-id is already c= onfigured. Because of this I observed the stream match conflicts on Juno b= oard. >>=20 >> (XEN) smmu: /iommu@7fb30000: Unexpected global fault, this could be seri= ous >> (XEN) smmu: /iommu@7fb30000: GFSR 0x00000004, GFSYNR0 0x00000006, GFSYN= R1 0x00000000, GFSYNR2 0x00000000 >>=20 >>=20 >> Below two patches is required to be ported to Xen to fix the issue from = Linux driver. >>=20 >> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/= drivers/iommu/arm-smmu.c?h=3Dlinux-5.8.y&id=3D1f3d5ca43019bff1105838712d55b= e087d93c0da >> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/= drivers/iommu/arm-smmu.c?h=3Dlinux-5.8.y&id=3D21174240e4f4439bb8ed6c116cdbd= c03eba2126e >=20 >=20 > Good catch and thanks for the pointers! Do you have any interest in > backporting these two patches or should I put them on my TODO list? Yes I am happy to backport these patches to XEN.=20 I will send the patch for review once 4.15 release branch out from master. =20 Regards, Rahul >=20 > Unrelated to who does the job, we should discuss if it makes sense to > try to fix the bug for 4.15. The patches don't seem trivial so I am > tempted to say that it might be best to leave the bug unfixed for 4.15 > and fix it later.