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 42796CFA466 for ; Mon, 24 Nov 2025 13:22:57 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 93E4A6B0027; Mon, 24 Nov 2025 08:22:56 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 8EEE46B0028; Mon, 24 Nov 2025 08:22:56 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7DDB96B0029; Mon, 24 Nov 2025 08:22:56 -0500 (EST) 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 6D1D66B0027 for ; Mon, 24 Nov 2025 08:22:56 -0500 (EST) Received: from smtpin21.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 3306858AC7 for ; Mon, 24 Nov 2025 13:22:56 +0000 (UTC) X-FDA: 84145565952.21.0831E9C Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf26.hostedemail.com (Postfix) with ESMTP id 88C5114000A for ; Mon, 24 Nov 2025 13:22:54 +0000 (UTC) Authentication-Results: imf26.hostedemail.com; dkim=none; spf=pass (imf26.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=1763990574; 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=vgN1Dl8//YP4AAH7YH7ckHY2/xdqQ5K9UykyI+hwA0g=; b=AftZ/6VrEQ0Sq+9spg8xIe0jkNVXfr3VZ8eLhOe9w8c82EhsQTdJDspbfU2tBnUXzBF2F0 mudigTCsfPcyQBboCQBg3WuuLgPlgBkvfsmb9R1ZKn+gt7SfQTJJxN11useQMy6CNe5cCU 9RVhPiD0dz4XMZrsMLtt8Zhe9mlGUkI= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1763990574; a=rsa-sha256; cv=none; b=ocMUBOUTE9iMOeruqtNMQkNFq8g1qvF1AqZk+9e6DHbUr3N0RKYkeDP1yi7iGP0yKSpx3C qCqtwc58DXSMpyCi5yvW0KwhOm9n3kfndDIZyn/eE2evlO1p7OQrUNQCv3gqCNnobS0z++ Ja/vpGfJgubhfun2v0fRqV2DDtcaTxU= ARC-Authentication-Results: i=1; imf26.hostedemail.com; dkim=none; spf=pass (imf26.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 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 351551515; Mon, 24 Nov 2025 05:22:46 -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 85C673F73B; Mon, 24 Nov 2025 05:22:48 -0800 (PST) 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 , "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 v5 02/12] x86/xen: simplify flush_lazy_mmu() Date: Mon, 24 Nov 2025 13:22:18 +0000 Message-ID: <20251124132228.622678-3-kevin.brodsky@arm.com> X-Mailer: git-send-email 2.51.2 In-Reply-To: <20251124132228.622678-1-kevin.brodsky@arm.com> References: <20251124132228.622678-1-kevin.brodsky@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Rspam-User: X-Rspamd-Queue-Id: 88C5114000A X-Stat-Signature: 6d3nmq96yr1kemcr87xy94xjdup1h8rp X-HE-Tag: 1763990574-62627 X-HE-Meta: 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 DayllG7e gBMDhA7d5fPe9EQ48Ohs19uEa1MTbLBdzykodVSFr1oXLMO2T8Vr7ZON5/p0W9vIX5X3azqH63m7ac8+6O+5aWyyMroSV1rFq/jVDBFLBHaFokZO0elkIvriGeh8tksxqiDMFe2SzNQtqVPLt1/hyU7ujfQkgYfAa2PMgWiGf0vdea+lC2C4168UjxNVkM9CUqMZl8EC5Oi4Xv8qqBuNft9NJLBzHMpy2rNmgFuVKnTt4q/zvJCEZbK3bCuJcs38NW2ghbANXDUgl+mAhauTFvLtJaEFwfwVE+bjLuMFxGWPypNiBRAaQheka1qobgg1NGxdiQ+aI2HKz5PJd7EbVnmFApFohsu7lN3qd 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 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