From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 982C5D5B17D for ; Mon, 15 Dec 2025 15:03:52 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id E64516B0008; Mon, 15 Dec 2025 10:03:51 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id E14606B000A; Mon, 15 Dec 2025 10:03:51 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CDCBA6B000C; Mon, 15 Dec 2025 10:03:51 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id B9A3F6B0008 for ; Mon, 15 Dec 2025 10:03:51 -0500 (EST) Received: from smtpin23.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 5BF3313A4C8 for ; Mon, 15 Dec 2025 15:03:51 +0000 (UTC) X-FDA: 84222025062.23.3B75CEF Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf09.hostedemail.com (Postfix) with ESMTP id C01D8140020 for ; Mon, 15 Dec 2025 15:03:49 +0000 (UTC) Authentication-Results: imf09.hostedemail.com; dkim=none; spf=pass (imf09.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com; dmarc=pass (policy=none) header.from=arm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1765811029; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=SXEJuzPtTZCpVI2VeTJf0oSQLFrAumMQIHEoQAJpQxQ=; b=Zawb0Tbjb4bOrX51fx7tZNEBNQIHUzFO+k6Ms0lm2iype6q9EkquR2XzfFyICTsPJm3+HQ Udi5dfxXvbjaD+s8ssnp0TbemD10yJyMeZi9BIe3VbPItcxoptFTWrcKT7ifPYF2FLw42+ Q68gXoG8PZNy6K+wMoE+XdhYyKcj2+A= ARC-Authentication-Results: i=1; imf09.hostedemail.com; dkim=none; spf=pass (imf09.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com; dmarc=pass (policy=none) header.from=arm.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1765811029; a=rsa-sha256; cv=none; b=V+sJSz3n7sVXwhLqNApz45e6zja5LxarbNDX8n7z1ncvEDHskbu5taLS06dgFt4BEMqUh3 QaedgYggGzGvOgReRX7Za9kk3S82X3uWeoKP303GfwRTFHYSSs8mnxkcJuWMLyf0d/Vrod bzZj6s22dMCa5LauibuC39ijukiO8r0= Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 80DEC1655; Mon, 15 Dec 2025 07:03:41 -0800 (PST) Received: from e123572-lin.arm.com (e123572-lin.cambridge.arm.com [10.1.194.54]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 5F7113F73B; Mon, 15 Dec 2025 07:03:43 -0800 (PST) From: Kevin Brodsky To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Kevin Brodsky , Alexander Gordeev , Andreas Larsson , Andrew Morton , Anshuman Khandual , Boris Ostrovsky , Borislav Petkov , Catalin Marinas , Christophe Leroy , Dave Hansen , David Hildenbrand , "David S. Miller" , David Woodhouse , "H. Peter Anvin" , Ingo Molnar , Jann Horn , Juergen Gross , "Liam R. Howlett" , Lorenzo Stoakes , Madhavan Srinivasan , Michael Ellerman , Michal Hocko , Mike Rapoport , Nicholas Piggin , Peter Zijlstra , "Ritesh Harjani (IBM)" , Ryan Roberts , Suren Baghdasaryan , Thomas Gleixner , Venkat Rao Bagalkote , Vlastimil Babka , Will Deacon , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org, xen-devel@lists.xenproject.org, x86@kernel.org Subject: [PATCH v6 02/14] x86/xen: simplify flush_lazy_mmu() Date: Mon, 15 Dec 2025 15:03:11 +0000 Message-ID: <20251215150323.2218608-3-kevin.brodsky@arm.com> X-Mailer: git-send-email 2.51.2 In-Reply-To: <20251215150323.2218608-1-kevin.brodsky@arm.com> References: <20251215150323.2218608-1-kevin.brodsky@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: 8s3p1smrft9ahnq869qogqop7cd8bo1m X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: C01D8140020 X-HE-Tag: 1765811029-882849 X-HE-Meta: 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 Pj49Ty+k 70C3CZYbWPY3wlUXJ2JI7ASUXimE2IXxB5K+bZ8WaivsoYF9odoEdoxsAD2rGNa0IOl7vs1E1N7iqjWTXJczenkNvpyz54N9vOjRxEouNZHw/Ywjg05TdZLjXkoa3p5WfZUjoDax9nWgNxymC8ELP8K0PyjSVZY3c/wLvo1fZ04ILplLkgEn4gIRv8907KWNElKrD/ZxxtqkGfOuwgXlSF3L0F5eNuR7mHU/L9R+4a0H9QuoCD8TZX54yj5h3HK6Db3sFYYREt+bkRggVEmkE9/Q1Zyx3BxYAt2ks3xpKB21OoCjnZDjPjc3cNnSfnQacB5jw1itAh1KipOt3lz77bXm9L4meSclU7/h3 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: arch_flush_lazy_mmu_mode() is called when outstanding batched pgtable operations must be completed immediately. There should however be no need to leave and re-enter lazy MMU completely. The only part of that sequence that we really need is xen_mc_flush(); call it directly. Reviewed-by: David Hildenbrand Reviewed-by: Ryan Roberts Reviewed-by: Juergen Gross Reviewed-by: Anshuman Khandual Signed-off-by: Kevin Brodsky --- arch/x86/xen/mmu_pv.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c index 2a4a8deaf612..7a35c3393df4 100644 --- a/arch/x86/xen/mmu_pv.c +++ b/arch/x86/xen/mmu_pv.c @@ -2139,10 +2139,8 @@ static void xen_flush_lazy_mmu(void) { preempt_disable(); - if (xen_get_lazy_mode() == XEN_LAZY_MMU) { - arch_leave_lazy_mmu_mode(); - arch_enter_lazy_mmu_mode(); - } + if (xen_get_lazy_mode() == XEN_LAZY_MMU) + xen_mc_flush(); preempt_enable(); } -- 2.51.2