ACK: [U/N][PATCH 1/1] UBUNTU: [Config] enable Intel DMA remapping by default

[Philip Cox]

On Wed, 2024-02-21 at 09:56 +0100, Andrea Righi wrote:
> 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).
> 
> Signed-off-by: Andrea Righi <andrea.righi at canonical.com>
> ---
>  debian.master/config/annotations | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/debian.master/config/annotations
> b/debian.master/config/annotations
> index 5c9c4f9afb11..d459e470d806 100644
> --- a/debian.master/config/annotations
> +++ b/debian.master/config/annotations
> @@ -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'>
> @@ -6567,7 +6570,6 @@ CONFIG_INTEL_IOATDMA                           
> policy<{'amd64': 'm'}>
>  CONFIG_INTEL_IOMMU                              policy<{'amd64':
> 'y'}>
>  CONFIG_INTEL_IOMMU_FLOPPY_WA                    policy<{'amd64':
> 'y'}>
>  CONFIG_INTEL_IOMMU_PERF_EVENTS                  policy<{'amd64':
> 'y'}>
> -CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON     policy<{'amd64':
> 'n'}>
>  CONFIG_INTEL_IOMMU_SVM                          policy<{'amd64':
> 'y'}>
>  CONFIG_INTEL_IPS                                policy<{'amd64':
> 'm'}>
>  CONFIG_INTEL_ISHTP_ECLITE                       policy<{'amd64':
> 'm'}>
> -- 
> 2.43.0
> 
> 

-- 
Acked-by: Philip Cox <philip.cox at canonical.com>

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