linux-kernel - Re: [RFC v2 5/9] x86/mm: Change cpa_flush() to call flush_kernel

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Message-ID: <20250521115458.GDaC2_EqaXGa8ZsImM@fat_crate.local>
Date: Wed, 21 May 2025 13:54:58 +0200
From: Borislav Petkov <bp@...en8.de>
To: Rik van Riel <riel@...riel.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.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, nadav.amit@...il.com, Rik van Riel <riel@...com>,
	Yu-cheng Yu <yu-cheng.yu@...el.com>
Subject: Re: [RFC v2 5/9] x86/mm: Change cpa_flush() to call
 flush_kernel_range() directly

On Mon, May 19, 2025 at 09:02:30PM -0400, Rik van Riel wrote:
> From: Rik van Riel <riel@...com>
> 
> The function cpa_flush() calls __flush_tlb_one_kernel() and
> flush_tlb_all().
> 
> Replacing that with a call to flush_tlb_kernel_range() allows
> cpa_flush() to make use of INVLPGB or RAR without any additional
> changes.
> 
> Initialize invlpgb_count_max to 1, since flush_tlb_kernel_range()
> can now be called before invlpgb_count_max has been initialized
> to the value read from CPUID.
> 
> [riel: remove now unused __cpa_flush_tlb]
> 
> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com>
> Signed-off-by: Rik van Riel <riel@...riel.com>

Please audit all your SOB chains.

-- 
Regards/Gruss,
    Boris.

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