From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 52F788632B; Mon, 24 Nov 2025 13:22:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763990576; cv=none; b=GoY10Dr2XPlaRjS3FLl7AfiDk35mjKn87VS8XupO2AoP8WPqLBm5Q+b8oQYwlof3pFgSwPWfz0+DOa2i1WH6n7yykfFacEhX5jFBXvjRkXyMPM84yXdt/9eABDrJTnMwVy4EduUQcluSZTnG+g/Sa4AP7eLuQAZkdUa6kkHxJd8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763990576; c=relaxed/simple; bh=fT6XYkwjjFkvKQ0d3pxDlQh178BBZVOC/iuww96QRbA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=G8xmLJ3D5vXnpjk3Up0d29165tSHFuH0dDDAjBrDdMpn1++mPjzfNMAB8WUVL3HxOcpZKrl8s4fSFEfDkSOB73mIM8h8hh0IzTmUXqch1yy69kapjiWMESa86DbmOqFpjo7OXhYbLNPAC0No0m9hfsqCfiQFrQGxsRUKcn8lDU0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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