ACK: [SRU][jammy:linux-azure][PATCH 0/3] Ubuntu 20.04 confidential VM deployments are failing

[Marcelo Henrique Cerri]

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On Mon, Jan 27 2025, John Cabaj wrote:
> BugLink: https://bugs.launchpad.net/bugs/2096813
>
> SRU Justification
>
> [Impact]
>
> * 20.04 Azure CVM (with 5.15 kernel) instances are failing to boot with high reproducibility
>
> [Fix]
>
> * Clean reverts of the following commits:
> * 8bd834015a5e: "UBUNTU: SAUCE: swiotlb: Split up single swiotlb lock"
> * 3db34e258474: "UBUNTU: SAUCE: swiotlb: allocate memory in a cache-friendly way"
> * 9e1b646a9cac: "UBUNTU: SAUCE: swiotlb: use bitmap to track free slots"
>
> [Test Plan]
>
> * Compile tested
> * Boot tested
> * Tested with Azure images, booted successfully 25 consecutive times
>
> [Regression potential]
>
> * Changes isolated, minimal regression risk. Changes were SAUCE patches, so reverting back to upstream functionality.
> * Likely small I/O performance hit under heavy I/O, but alleviates system hangs
>
> [Other info]
>
> * SF#00405149
>
> John Cabaj (3):
>   Revert "UBUNTU: SAUCE: swiotlb: Split up single swiotlb lock"
>   Revert "UBUNTU: SAUCE: swiotlb: allocate memory in a cache-friendly
>     way"
>   Revert "UBUNTU: SAUCE: swiotlb: use bitmap to track free slots"
>
>  .../admin-guide/kernel-parameters.txt         |   4 +-
>  arch/x86/kernel/acpi/boot.c                   |   4 -
>  include/linux/swiotlb.h                       |  44 +--
>  kernel/dma/swiotlb.c                          | 280 ++++++------------
>  4 files changed, 102 insertions(+), 230 deletions(-)
>
> -- 
> 2.43.0

LGTM

Acked-by: Marcelo Henrique Cerri <marcelo.cerri at canonical.com>

- -- 
Regards,
Marcelo
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