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

[Philip Cox]

On Fri, 2024-06-14 at 10:37 -0400, Philip Cox 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
> 

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