ACK: [SRU focal/linux-gcp 0/1] LP: #1958416 (IO failures on SEV GCP instances)

[Luke Nowakowski-Krijger]

Acked-by: Luke Nowakowski-Krijger <luke.nowakowskikrijger at canonical.com

On Wed, Nov 9, 2022 at 6:08 PM Thadeu Lima de Souza Cascardo <
cascardo at canonical.com> wrote:

> [Impact]
> Small SWIOTLB might cause DMA failures during High IO on GCP instances
> using SEV.
>
> [Test case]
> Boot n2d-standard-2 or n2d-standard-64 instances on GCP, issue a lot of IO,
> and look for DMA overflow or full swiotlb messages on dmesg.
>
> [Potential regression]
> Boot failures should not be discarded when SWIOTLB cannot be allocated.
>
> Ashish Kalra (1):
>   x86,swiotlb: Adjust SWIOTLB bounce buffer size for SEV guests
>
>  arch/x86/include/asm/mem_encrypt.h |  2 ++
>  arch/x86/kernel/setup.c            |  6 ++++++
>  arch/x86/mm/mem_encrypt.c          | 31 ++++++++++++++++++++++++++++++
>  include/linux/swiotlb.h            |  8 ++++++++
>  kernel/dma/swiotlb.c               | 20 +++++++++++++++++--
>  5 files changed, 65 insertions(+), 2 deletions(-)
>
> --
> 2.34.1
>
>
> --
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>
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