linux-kernel - Re: [PATCH v9 00/12] AMD broadcast TLB invalidation

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Message-ID: <20250206142308.GR7145@noisy.programming.kicks-ass.net>
Date: Thu, 6 Feb 2025 15:23:08 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Rik van Riel <riel@...riel.com>
Cc: Oleksandr Natalenko <oleksandr@...alenko.name>, x86@...nel.org,
	linux-kernel@...r.kernel.org, bp@...en8.de,
	dave.hansen@...ux.intel.com, zhengqi.arch@...edance.com,
	nadav.amit@...il.com, thomas.lendacky@....com, kernel-team@...a.com,
	linux-mm@...ck.org, akpm@...ux-foundation.org, jannh@...gle.com,
	mhklinux@...look.com, andrew.cooper3@...rix.com
Subject: Re: [PATCH v9 00/12] AMD broadcast TLB invalidation

On Thu, Feb 06, 2025 at 09:16:35AM -0500, Rik van Riel wrote:

> This can result in flush_tlb_mm_range being called
> with a stride_shift for 2MB pages, but a range ending
> on a 4kB aligned (not 2MB aligned) boundary.
> 
> Peter, how should we solve this one?

I don't think that's wrong per-se, since all we really need is for end
to be past the end, one byte, one page, or one stride don't matter much.

Anyway, I'm in desperate need of a break, so I'm not quite sure what the
best way forward is.