From nobody Wed Dec 17 00:06:23 2025 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 4E0AC332902; Mon, 15 Dec 2025 15:03:49 +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=1765811030; cv=none; b=YhwR8sP4NeixgYPkSbuaH/keBRu7Df3CJiorCrr9xppPP05GJWkNMMk5tdqyxJxl+a2sUtaGVcQ8k5Tfv7XL+mjL/YIeOvu/dcKR9uSHf+d02ct4UIjO8n27V+bw5dkO7HzcsrpSBz7PQW3/9kXBuA3x+bpBC8syqVVtThcSLBU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765811030; c=relaxed/simple; bh=O+wDRR3PpTS+EXXQ4+pAZKQW946eyAv3UVy/U7rFN8Q=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=MZY15nJQL6h4DX0LJjV3NFdUcJnvnqRk1nn2hg+U4TNMUQ4lokZFQeLZp5M7Snb0D1Qn/s4mWA3MYOtvO0LdivYia/vwQtYdV8ln4h6TayTaIQRHSNAJH8Qu/dLK6u9V3RdlCPBJDl6Ak82TDTwC3PVXIZ57Bm9iZSb6OdMLbXs= 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 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> 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 Content-Type: text/plain; charset="utf-8" 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(); =20 - if (xen_get_lazy_mode() =3D=3D XEN_LAZY_MMU) { - arch_leave_lazy_mmu_mode(); - arch_enter_lazy_mmu_mode(); - } + if (xen_get_lazy_mode() =3D=3D XEN_LAZY_MMU) + xen_mc_flush(); =20 preempt_enable(); } --=20 2.51.2