From nobody Wed Dec 17 03:00:08 2025 Received: from shelob.surriel.com (shelob.surriel.com [96.67.55.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 00DD71BDC3 for ; Fri, 21 Feb 2025 00:54:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=96.67.55.147 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740099252; cv=none; b=VHjNcW3U6weQmwAJAkY8Vj/lwJChQSQd51N0qcnsiIVXnbWMSt1x4OGTqkUuXxoHXwKnlFzqkHSQN1cWGkYvk9J00J3x8in2+9O/GkAEOSwlQnO8TjRzFN+rGTsPErsfZEyxug1U9FOQBA/DpA0YDzpZM/4LDsv6zMY8+YDGwEU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740099252; c=relaxed/simple; bh=zlfz1ZVFQiGJXQEMWXYabmOodmJJcIh2c1j+uC8AoQg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=I7HGuH/rjHanesm/AFq716gbw/HED6cXpjv6iFrG7yN/7wK9ewZ7v/7XCMtI+ZXm5jlXajfK9DprcPPPAbqEffTSGdPqSnj3RqSeQOz7a/5xz1tw4PkApVsv9QzQ9VpsF7z5Nu9ElIX6Aug5CMXBr/4htdKKOjWR/IWyuGo9c/U= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=surriel.com; spf=pass smtp.mailfrom=shelob.surriel.com; arc=none smtp.client-ip=96.67.55.147 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=surriel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=shelob.surriel.com Received: from fangorn.home.surriel.com ([10.0.13.7]) by shelob.surriel.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.97.1) (envelope-from ) id 1tlHIZ-000000003Qf-1C5m; Thu, 20 Feb 2025 19:53:47 -0500 From: Rik van Riel To: x86@kernel.org Cc: linux-kernel@vger.kernel.org, bp@alien8.de, peterz@infradead.org, dave.hansen@linux.intel.com, zhengqi.arch@bytedance.com, nadav.amit@gmail.com, thomas.lendacky@amd.com, kernel-team@meta.com, linux-mm@kvack.org, akpm@linux-foundation.org, jackmanb@google.com, jannh@google.com, mhklinux@outlook.com, andrew.cooper3@citrix.com, Manali.Shukla@amd.com, Rik van Riel Subject: [PATCH v12 07/16] x86/mm: use INVLPGB in flush_tlb_all Date: Thu, 20 Feb 2025 19:53:06 -0500 Message-ID: <20250221005345.2156760-8-riel@surriel.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250221005345.2156760-1-riel@surriel.com> References: <20250221005345.2156760-1-riel@surriel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Sender: riel@surriel.com Content-Type: text/plain; charset="utf-8" The flush_tlb_all() function is not used a whole lot, but we might as well use broadcast TLB flushing there, too. Signed-off-by: Rik van Riel Tested-by: Manali Shukla Tested-by: Brendan Jackman Tested-by: Michael Kelley --- arch/x86/mm/tlb.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c index 59396a3c6e9c..2d7ed0fda61f 100644 --- a/arch/x86/mm/tlb.c +++ b/arch/x86/mm/tlb.c @@ -1065,6 +1065,16 @@ void flush_tlb_mm_range(struct mm_struct *mm, unsign= ed long start, } =20 =20 +static bool broadcast_flush_tlb_all(void) +{ + if (!cpu_feature_enabled(X86_FEATURE_INVLPGB)) + return false; + + guard(preempt)(); + invlpgb_flush_all(); + return true; +} + static void do_flush_tlb_all(void *info) { count_vm_tlb_event(NR_TLB_REMOTE_FLUSH_RECEIVED); @@ -1074,6 +1084,12 @@ static void do_flush_tlb_all(void *info) void flush_tlb_all(void) { count_vm_tlb_event(NR_TLB_REMOTE_FLUSH); + + /* First try (faster) hardware-assisted TLB invalidation. */ + if (broadcast_flush_tlb_all()) + return; + + /* Fall back to the IPI-based invalidation. */ on_each_cpu(do_flush_tlb_all, NULL, 1); } =20 --=20 2.47.1