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

[Stefan Bader]

On 09.11.22 18:06, Thadeu Lima de Souza Cascardo 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(-)
> 

Hm, is this really only needed for the gcp kernel? Are we not also run tests for 
the focal:linux kernel on the GCP cloud?

-Stefan

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