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 AC125CCF9EB for ; Wed, 29 Oct 2025 10:10:05 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id DBC648E0051; Wed, 29 Oct 2025 06:10:04 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id D6B858E0045; Wed, 29 Oct 2025 06:10:04 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C33D98E0051; Wed, 29 Oct 2025 06:10:04 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id AD1EC8E0045 for ; Wed, 29 Oct 2025 06:10:04 -0400 (EDT) Received: from smtpin13.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 70C29C07E4 for ; Wed, 29 Oct 2025 10:10:04 +0000 (UTC) X-FDA: 84050731128.13.B3A93BC Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf27.hostedemail.com (Postfix) with ESMTP id D76A84000D for ; Wed, 29 Oct 2025 10:10:02 +0000 (UTC) Authentication-Results: imf27.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf27.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1761732603; 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=qTnV0i06/09SpCKqB8E7ZEL3p/dD9TNWu4Sk0kLJbY0=; b=3aVz5KxZN1mwFQ/VCpDogJmG7cx4/ctGfw3kwzaRIVGKo0G66hckgIT1vUxLfq0mJ1qyUU ssdaFpCRECWN8sqsK34FapNQGFDrHJQnUdgG+pRxQAWhL/6Cti++ovbl9tYtkxdx2ivSv0 I3JgLdCVuXuxObnm2MCytN49QCSsCcs= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1761732603; a=rsa-sha256; cv=none; b=pC+hMDSu/+YX/ZEbB5NWttlXyQXcLDNvxIMb+7KTVHFGF1JGjVf9/wMxqVu08ASVM5Ejt/ VXJlNPP+LLSlw0gQs0JY/EOiMPuk9bVtyoMr/y+1J1jh3hPW3fQSO8JWl7LPKra+gAyucz 3WFM2L+N7wEvkxDqrCq3UxD8Jeg7DC4= ARC-Authentication-Results: i=1; imf27.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf27.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com 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 4895F2BCB; Wed, 29 Oct 2025 03:09:54 -0700 (PDT) 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 369DF3F66E; Wed, 29 Oct 2025 03:09:57 -0700 (PDT) From: Kevin Brodsky To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Kevin Brodsky , Alexander Gordeev , Andreas Larsson , Andrew Morton , 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 , Ryan Roberts , Suren Baghdasaryan , Thomas Gleixner , 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 v4 02/12] x86/xen: simplify flush_lazy_mmu() Date: Wed, 29 Oct 2025 10:08:59 +0000 Message-ID: <20251029100909.3381140-3-kevin.brodsky@arm.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20251029100909.3381140-1-kevin.brodsky@arm.com> References: <20251029100909.3381140-1-kevin.brodsky@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: D76A84000D X-Rspamd-Server: rspam02 X-Stat-Signature: oqk53md6bjyexxtnjachgi1jpi9g6ggm X-HE-Tag: 1761732602-317576 X-HE-Meta: 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 xmj5glIV 7VPXnKr8rMckLgmyhnHD1rgsJDT7kVpyXo8M+UIfGOpbCRB4aGnA3HFkz4J97WT8BN9v2kTHwx3aC6tm1ih7aOwzwiu1gISMdtnWQ3swPB7Ml1lGmTx6z+1W2MIxc/SyBzpIWxIQaDclN4TxJqojm1A+VMgbOulQGpRfdboNB2vVQMdIiOJpAL5hPGNhcSTdJkrNvLudAJ+L1/EM= 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. 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(); } -- 2.47.0