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UBUNTU: [Config] enable Intel DMA remapping by default

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BugLink: https://bugs.launchpad.net/bugs/1951440

We have tried in the past to enable CONFIG_INTEL_IOMMU_DEFAULT_ON and
CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON (starting with Jammy), but
there were multiple issues (especially with old hardware), so we ended
up disabling these options afterwards, see LP: #1971699.

Considering that IOMMU is enabled by default in upstream kernels,
probably most of these issues are solved now (or old hardware has been
decommissioned).

Moreover, having this enabled by default can prevent potential issues
with modern hardware and drivers (see for example LP #1958004).

Acked-by: Philip Cox <philip.cox@canonical.com>
Acked-by: Andrei Gherzan <andrei.gherzan@canonical.com>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
This commit is contained in:
Andrea Righi
2024-02-21 09:46:24 +01:00
committed by Paolo Pisati
parent 9f9563d7cb
commit 77e530c1a8
1 changed files with 5 additions and 2 deletions
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debian.master/config/annotations
+5 -2
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@@ -321,8 +321,11 @@ CONFIG_INTEL_ATOMISP note<'LP: #2017444'>
CONFIG_INTEL_ATOMISP2_PM policy<{'amd64': 'm'}>
CONFIG_INTEL_ATOMISP2_PM note<'LP: #2017444'>
CONFIG_INTEL_IOMMU_DEFAULT_ON policy<{'amd64': 'n'}>
CONFIG_INTEL_IOMMU_DEFAULT_ON note<'LP: #1971699'>
CONFIG_INTEL_IOMMU_DEFAULT_ON policy<{'amd64': 'y'}>
CONFIG_INTEL_IOMMU_DEFAULT_ON note<'LP: #1951440'>
CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON policy<{'amd64': 'y'}>
CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON note<'LP: #1951440'>
CONFIG_IOMMU_DEBUGFS policy<{'amd64': 'n', 'arm64': 'n', 'armhf': 'n', 'ppc64el': 'n', 'riscv64': 'n', 's390x': 'n'}>
CONFIG_IOMMU_DEBUGFS note<'LP: #1861057'>