ACK: [SRU][F:linux-aws][PATCH 0/1] Backport "iommu/arm-smmu-v3: Don't reserve implementation defined register space"

[Massimiliano Pellizzer]

On Wed, 26 Mar 2025 at 21:55, Magali Lemes <magali.lemes at canonical.com> wrote:
>
> BugLink: https://bugs.launchpad.net/bugs/2067864
>
> [Impact]
> In order to solve boot issues with new instance types running the 5.4 kernels,
> AWS has requested a backport of upstream commit 52f3fab0067d
> ("iommu/arm-smmu-v3: Don't reserve implementation defined register space").
>
> [Fix]
> There was a conflict when adding arm_smmu_ioremap() due to the current
> context missing ab246774713e ("iommu/arm-smmu-v3: Unregister IOMMU and
> bus ops on device removal").
>
> [Test]
> It's been tested that the new instances can boot successfully with the AWS 5.4
> kernels with this patch applied.
>
> [Where problems could occur]
> This touches probing of the ARM SMMUv3 driver, which might lead to boot
> failures or system instability.
>
> [Other info]
> SF #00407928
>
> Jean-Philippe Brucker (1):
>   iommu/arm-smmu-v3: Don't reserve implementation defined register space
>
>  drivers/iommu/arm-smmu-v3.c | 35 +++++++++++++++++++++++++++++++----
>  1 file changed, 31 insertions(+), 4 deletions(-)
>
> --
> 2.34.1
>
>
> --
> kernel-team mailing list
> kernel-team at lists.ubuntu.com
> https://lists.ubuntu.com/mailman/listinfo/kernel-team

Acked-by: Massimiliano Pellizzer <massimiliano.pellizzer at canonical.com>

-- 
Massimiliano Pellizzer