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Wed, 21 May 2025 11:54:59 +0000 (UTC) Date: Wed, 21 May 2025 13:54:58 +0200 From: Borislav Petkov To: Rik van Riel Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, kernel-team@meta.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, nadav.amit@gmail.com, Rik van Riel , Yu-cheng Yu Subject: Re: [RFC v2 5/9] x86/mm: Change cpa_flush() to call flush_kernel_range() directly Message-ID: <20250521115458.GDaC2_EqaXGa8ZsImM@fat_crate.local> References: <20250520010350.1740223-1-riel@surriel.com> <20250520010350.1740223-6-riel@surriel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20250520010350.1740223-6-riel@surriel.com> On Mon, May 19, 2025 at 09:02:30PM -0400, Rik van Riel wrote: > From: Rik van Riel > > 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 > Signed-off-by: Rik van Riel Please audit all your SOB chains. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette