[{"id":3678882,"web_url":"http://patchwork.ozlabs.org/comment/3678882/","msgid":"","list_archive_url":null,"date":"2026-04-17T20:30:04","subject":"ACK: [SRU][J:linux-gcp-6.8][PATCH 0/1] Disable IOMMU Passthrough by\n default","submitter":{"id":87961,"url":"http://patchwork.ozlabs.org/api/people/87961/","name":"Kevin Becker","email":"kevin.becker@canonical.com"},"content":"On Thu, Apr 16, 2026 at 8:23 PM Ian Whitfield \nwrote:\n\n> BugLink: https://bugs.launchpad.net/bugs/2148627\n>\n> [Impact]\n>\n> Google reported to us that some of their hardware fails to finish booting\n> due to\n> a kernel hang on 22.04 linux-gcp-6.8. This issue was traced to IOMMU\n> passthrough\n> being enabled by default, which was to originally resolve LP: #2085904. The\n> root cause of that issue was fixed via a firmware update, so IOMMU\n> passthrough\n> no longer needs to be enabled by default, and this config change can now be\n> reverted. On a test kernel with the change reverted, the new issue\n> reported by\n> Google is no longer reproducible.\n>\n> [Fix]\n>\n> Remove the config annotations that enable IOMMU passthrough by default.\n>\n> [Test Plan]\n>\n> To confirm that the C3-metal issue is resolved, repeat the test plan for\n> LP:\n> #2085904. Any failures indicate that IOMMU passthrough needs to remain\n> enabled\n> by default.\n>\n> To confirm that the new issue is resolved, verify that the specified\n> hardware\n> is able to now boot after the change is applied, without hanging during\n> IOMMU\n> initialization.\n>\n> [Regression potential]\n>\n> Regression potential is low because the annotation change is provably\n> effective\n> at changing the config, and we can confirm both of the affected instance\n> types\n> have their original problems resolved by the change.\n>\n> Ian Whitfield (1):\n> UBUNTU: [Config] gcp-6.8: Disable IOMMU passthrough by default\n>\n> debian.gcp-6.8/config/annotations | 9 ---------\n> 1 file changed, 9 deletions(-)\n>\n> --\n> 2.43.0\n\n\n Acked-by: Kevin Becker ","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (4096-bit key;\n unprotected) header.d=canonical.com header.i=@canonical.com\n header.a=rsa-sha256 header.s=20251003 header.b=WnhhcYoL;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ubuntu.com\n (client-ip=185.125.189.65; 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This issue was traced to IOMMU passthrough\n> being enabled by default, which was to originally resolve LP: #2085904. The\n> root cause of that issue was fixed via a firmware update, so IOMMU passthrough\n> no longer needs to be enabled by default, and this config change can now be\n> reverted. On a test kernel with the change reverted, the new issue reported by\n> Google is no longer reproducible.\n>\n> [Fix]\n>\n> Remove the config annotations that enable IOMMU passthrough by default.\n>\n> [Test Plan]\n>\n> To confirm that the C3-metal issue is resolved, repeat the test plan for LP:\n> #2085904. Any failures indicate that IOMMU passthrough needs to remain enabled\n> by default.\n>\n> To confirm that the new issue is resolved, verify that the specified hardware\n> is able to now boot after the change is applied, without hanging during IOMMU\n> initialization.\n>\n> [Regression potential]\n>\n> Regression potential is low because the annotation change is provably effective\n> at changing the config, and we can confirm both of the affected instance types\n> have their original problems resolved by the change.\n>\n> Ian Whitfield (1):\n> UBUNTU: [Config] gcp-6.8: Disable IOMMU passthrough by default\n>\n> debian.gcp-6.8/config/annotations | 9 ---------\n> 1 file changed, 9 deletions(-)\n\nAcked-by: Vinicius Peixoto ","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (4096-bit key;\n unprotected) header.d=canonical.com header.i=@canonical.com\n header.a=rsa-sha256 header.s=20251003 header.b=W/OttYGP;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ubuntu.com\n (client-ip=185.125.189.65; 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