linux-kernel - Re: [PATCH 01/12] x86/mm: make MMU_GATHER_RCU_TABLE

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Message-ID: <20250102115237.GGZ3Z-BUqBauHEfB10@fat_crate.local>
Date: Thu, 2 Jan 2025 12:52:37 +0100
From: Borislav Petkov <bp@...en8.de>
To: Rik van Riel <riel@...riel.com>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org, kernel-team@...a.com,
	dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	akpm@...ux-foundation.org, nadav.amit@...il.com,
	zhengqi.arch@...edance.com, linux-mm@...ck.org
Subject: Re: [PATCH 01/12] x86/mm: make MMU_GATHER_RCU_TABLE_FREE
 unconditional

On Tue, Dec 31, 2024 at 11:30:48AM -0500, Rik van Riel wrote:
> I'll wait for you to finish making your way
> through before coming up with a v4 :)

Thanks!

> It looks like with this patch the translation cache
> extensions get enabled (when I read back the MSR),
> but the AMD manual suggests I may need to enable
> EFER.TCE separately on every CPU?

Yes, you do. EFER is a per-thread MSR.

cpu/amd.c is where we usually do enable features.

Thx.

-- 
Regards/Gruss,
    Boris.

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