From: Rik van Riel <riel@surriel.com>
To: Jann Horn <jannh@google.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>
Cc: Toshi Kani <toshi.kani@hpe.com>,
linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH] x86/mm: Fix paging-structure cache flush on kernel table freeing
Date: Thu, 29 May 2025 12:35:23 -0400 [thread overview]
Message-ID: <aa5f8dbbb5865e7eeb64628beef24fe05d161855.camel@surriel.com> (raw)
In-Reply-To: <20250528-x86-fix-vmap-pt-del-flush-v1-1-e250899ed160@google.com>
On Wed, 2025-05-28 at 22:30 +0200, Jann Horn wrote:
>
> Note that since I'm not touching invlpgb_kernel_range_flush() or
> invlpgb_flush_addr_nosync() in this patch, the flush on PMD table
> deletion
> with INVLPGB might be a bit slow due to using PTE_STRIDE instead of
> PMD_STRIDE. I don't think that matters.
>
Agreed that this is probably fine.
The performance sensitive kernel flushes mostly seem
to be small, related to static key toggling, etc
> Cc: stable@vger.kernel.org
> Fixes: 28ee90fe6048 ("x86/mm: implement free pmd/pte page
> interfaces")
> Signed-off-by: Jann Horn <jannh@google.com>
Reviewed-by: Rik van Riel <riel@surriel.com>
--
All Rights Reversed.
prev parent reply other threads:[~2025-05-29 16:41 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-28 20:30 [PATCH] x86/mm: Fix paging-structure cache flush on kernel table freeing Jann Horn
2025-05-29 16:35 ` Rik van Riel [this message]
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