APPLIED: [j/n][linux-aws][PATCH 0/2 v2] aws: Backport linear memory map change

[Philip Cox]

On Jun 14 2024, at 10:49 am, Philip Cox <philip.cox at canonical.com> wrote:
>
> BugLink: https://bugs.launchpad.net/bugs/2069352
> SRU Justification:
> [Impact]
> AWS discovered an issue of long EC2 instance launch times on the upcoming R8g instance types.
> [Fix]
> They have identified the following fixes that address this issue:
> * https://patchew.org/linux/20240412131908.433043-1-ryan.roberts@arm.com/20240412131908.433043-2-ryan.roberts@arm.com/
> * https://patchew.org/linux/20240412131908.433043-1-ryan.roberts@arm.com/20240412131908.433043-3-ryan.roberts@arm.com/
>
> They would like this fixed in the jammy, and noble kernels.
>
> For reference, here are the links to the above patches in 6.10-rc3:
> * arm64: mm: Don't remap pgtables per-cont(pte|pmd) block
> https://github.com/torvalds/linux/commit/5c63db59c5f89925add57642be4f789d0d671ccd
> * arm64: mm: Batch dsb and isb when populating pgtables
> https://github.com/torvalds/linux/commit/1fcb7cea8a5f7747e02230f816c2c80b060d9517
>
>
> AWS has requested only the first two patches of the series of three patches be back ported.
> [Test Plan]
> I have tested this, as has AWS.
>
> [Where problems could occur]
> With the reordering of tlb invalidation and memory barriers, there is some risk, but this chance for regressions on this change is fairly small as the scope is fairly narrow.
>
> [Other info]
> SF# 00387444
>
>
> Changes from v1:
> Noticed patches tagged to mantic rather than noble. Fixed subject titles.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.ubuntu.com/archives/kernel-team/attachments/20240619/cf60fedd/attachment.html>