From patchwork Fri Oct 7 23:41:49 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oliver Upton X-Patchwork-Id: 13001549 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 70F7CC433F5 for ; Fri, 7 Oct 2022 23:42:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229547AbiJGXmO (ORCPT ); Fri, 7 Oct 2022 19:42:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34614 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229728AbiJGXmF (ORCPT ); Fri, 7 Oct 2022 19:42:05 -0400 Received: from out2.migadu.com (out2.migadu.com [188.165.223.204]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C9CE3A98F7 for ; Fri, 7 Oct 2022 16:42:04 -0700 (PDT) X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1665186123; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=8gk76JRqjPqMzkfoKmXkwFy1NQbQ1ICsFcGyhsYU5J0=; b=v/KiVBTDrWvVn+101zSX+yMTklfcDfKoScD2vAnF13qg7YbpUTAe7yBbTpCiXRoBauVVq6 u4QQyKsJyiZHkTVlzpoDMQoMyEwou6RWbcC1OnniQKHbu1HXKUNwF+xXqNFfUlc4wCga/N PJeClBh18muHjmvswN/3a9VXwgI940o= From: Oliver Upton To: Marc Zyngier , James Morse , Alexandru Elisei Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, Ricardo Koller , David Matlack , Quentin Perret , kvmarm@lists.linux.dev, Oliver Upton Subject: [PATCH v3 0/2] KVM: arm64: Limit stage2_apply_range() batch size to largest block Date: Fri, 7 Oct 2022 23:41:49 +0000 Message-Id: <20221007234151.461779-1-oliver.upton@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Continuing with MMU patches to post, a small series fixing some soft lockups caused by stage2_apply_range(). Depending on the paging setup, we could walk a very large amount of memory before dropping the lock and rescheduling. Applies to kvmarm-6.1. Tested with KVM selftests and kvm-unit-tests with all supported page sizes (4K, 16K, 64K). Additionally, I no longer saw soft lockups with the following: ./dirty_log_perf_test -m -2 -s anonymous_thp -b 4G -v 48 v2: https://lore.kernel.org/kvmarm/20220926222146.661633-1-oliver.upton@linux.dev/ v2 -> v3: - Just use the largest block size as the batch size (Marc) Oliver Upton (2): KVM: arm64: Work out supported block level at compile time KVM: arm64: Limit stage2_apply_range() batch size to largest block arch/arm64/include/asm/kvm_pgtable.h | 18 +++++++++++++----- arch/arm64/include/asm/stage2_pgtable.h | 20 -------------------- arch/arm64/kvm/mmu.c | 9 ++++++++- 3 files changed, 21 insertions(+), 26 deletions(-) base-commit: b302ca52ba8235ff0e18c0fa1fa92b51784aef6a