From patchwork Sun Oct 6 10:46:33 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 11176275 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D358A76 for ; Sun, 6 Oct 2019 10:47:01 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id AD951214D9 for ; Sun, 6 Oct 2019 10:47:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="d5PQLayi"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="xQlAvOWU" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AD951214D9 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject: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=k4oORP9kjLoq1vheNyYs95OLijqtLsMnG1xrnpNKv5Y=; b=d5PQLayivF94rV vngiztG5WvSSJu0XQ/eW6GCs0sA8X2fdwhcbE4izSaTTg79mdwFZ7sduwE7SVfZVbSTjCOaEl5LZQ ZRJIN3sYBf1BI1fBzZvFiRWY/SMKAohVgb8bXV30aq+nZs/b7MJxhVSnqSphiJWOe+oNm2C1eX2q/ ToKNoHaowtcJEfPrgTmYvk6/NKf5vQbad6PmWkrrsMRKYxOd/8IG6DtGHsb1nzDUqAZi7HwVCUBYu XgUITbAwBhmDxz1nTCvgDO09miESkH4ZBNp03N+4ZbdYiOv4ATlLhD2n/Ub/7i2otIgS3y1GbMW2M rHeI6UOcjoLAm3qEGUpw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.2 #3 (Red Hat Linux)) id 1iH445-0005WX-An; Sun, 06 Oct 2019 10:47:01 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.2 #3 (Red Hat Linux)) id 1iH443-0005W8-2b for linux-arm-kernel@lists.infradead.org; Sun, 06 Oct 2019 10:47:00 +0000 Received: from localhost.localdomain (82-132-217-85.dab.02.net [82.132.217.85]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 66D232084D; Sun, 6 Oct 2019 10:46:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570358818; bh=5F1vOMzribkWPxS/i0/IDvYHGJESKxSllK/Tnob7QXY=; h=From:To:Cc:Subject:Date:From; b=xQlAvOWUndDfG+W9cFUCIMRr1I1Cp8uID0IDvLC6gmS8Y6pIi8kJYXLoYh7HYL3cD LC8H8dKP2tMYEGIMPAwrR/ssMZxpyd0ctFBtf+TbFXMYaCjl6nDMp1RD77NchJx70P V78sQp7xBgsYCEjDFcg62KQhDwSESd5erSE+aY44= From: maz@kernel.org To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Subject: [PATCH 0/3] KVM: arm64: Assorted PMU emulation fixes Date: Sun, 6 Oct 2019 11:46:33 +0100 Message-Id: <20191006104636.11194-1-maz@kernel.org> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191006_034659_136248_DA1A593E X-CRM114-Status: UNSURE ( 8.02 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -5.2 (-----) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-5.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at https://www.dnswl.org/, high trust [198.145.29.99 listed in list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Suzuki K Poulose , Marc Zyngier , James Morse , Andrew Murray , Julien Thierry Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Marc Zyngier I recently came across a number of PMU emulation bugs, all which can result in unexpected behaviours in an unsuspecting guest. The first two patches already have been discussed on the list, but I'm including them here as part of a slightly longer series. The last patch fixes an issue that has been here from day one, where we confuse architectural overflow of a counter and perf sampling period. If nobody disagrees, I'll send them upstream shortly. Marc Zyngier (3): KVM: arm64: pmu: Fix cycle counter truncation arm64: KVM: Handle PMCR_EL0.LC as RES1 on pure AArch64 systems KVM: arm64: pmu: Reset sample period on overflow handling arch/arm64/kvm/sys_regs.c | 4 ++++ virt/kvm/arm/pmu.c | 34 ++++++++++++++++++++++++---------- 2 files changed, 28 insertions(+), 10 deletions(-)