From patchwork Wed Nov 16 16:56:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oliver Upton X-Patchwork-Id: 13045587 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id ACD73C433FE for ; Wed, 16 Nov 2022 16:58:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:Cc :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=7e+M4wfn9+uNJRyejNVOIcG/cuY7K3O8nFto1h1vpTQ=; b=Z3sKmBLfrmhvo0 ZAWdCdFbbVKhVPsmuobcHtimCUwvWQzX01K9aD9l1+FzxB//HH/Pt54eKHiOnCrzX3hq5jL6OLq0m QcQCJQagFymm/lAoActMkEGaTUivBkLzba2qaw3FHIvQz/vqbCEp/xCDyF9AZpfGIq7OLX0rGlzmz +VM4Q/VqAmUgaId0ll9FYN5vN4mNrpo8+kZ0weLTEfEQKYM+XzXs+miUF3j1wpkKYC+b3jSn7wyP8 FRBUXj+4TeNs0O6xvW7S1fs8kv+T7wNwUvia8eYzu2ZL6i2xOmQfD/4UooYcXDd+u4rtUNBKXXGUp i00EMZonocjkWeAXOGwQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1ovLiv-00680G-AR; Wed, 16 Nov 2022 16:57:17 +0000 Received: from out2.migadu.com ([188.165.223.204]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1ovLir-0067zH-Ao for linux-arm-kernel@lists.infradead.org; Wed, 16 Nov 2022 16:57:15 +0000 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=1668617829; 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=TdFPell1GyLBX2SIEk5RntQAA4Vog6nIAXIY95c98cY=; b=SOKzPo9L8c2aAODZKx24AXi3Um/xxFEqfqF+qClyOQk8l/W5JKOLZSoadwrDaURh9kKj7g R1EvOLI2gkz/G1vwxqkqABx1MOHaD9pxY1A3tpAVN93p2TWFicEUs7mPkhMdgKji4JOrCH of38SMfEsMvBHuPjfeI5HhspUIrtvwE= 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, kvmarm@lists.linux.dev, Will Deacon , Oliver Upton Subject: [PATCH v3 0/2] KVM: arm64: Fixes for parallel faults series Date: Wed, 16 Nov 2022 16:56:53 +0000 Message-Id: <20221116165655.2649475-1-oliver.upton@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221116_085714_381008_1A44B182 X-CRM114-Status: UNSURE ( 6.78 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Small set of fixes for the parallel faults series. Most importantly, stop taking the RCU read lock for walking hyp stage-1. For the sake of consistency, take a pointer to kvm_pgtable_walker in kvm_dereference_pteref() as well. Tested on an Ampere Altra system with kvm-arm.mode={nvhe,protected}. Applies to the parallel faults series picked up last week. v2: https://lore.kernel.org/kvmarm/20221115225502.2240227-1-oliver.upton@linux.dev/ v2 -> v3: - Pass a pointer to the walker instead of a bool (Marc) - Apply the aforementioned change to kvm_dereference_pteref() Oliver Upton (2): KVM: arm64: Take a pointer to walker data in kvm_dereference_pteref() KVM: arm64: Don't acquire RCU read lock for exclusive table walks arch/arm64/include/asm/kvm_pgtable.h | 154 +++++++++++++++------------ arch/arm64/kvm/hyp/pgtable.c | 10 +- 2 files changed, 88 insertions(+), 76 deletions(-)