From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5EFA6C2BA83 for ; Fri, 14 Feb 2020 16:11:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 34C39246A1 for ; Fri, 14 Feb 2020 16:11:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581696662; bh=Izh1q7FxqCspuUufDA0SeKtC98zPn21rVDYFbOw+Fmk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=uf4/7rL9QF6Tjow3UsZCrsQ2X3kYE58yW5pg5oPH8rF6UXBZxoPDjXCYTGhfFz0Sw FgP/lfHmLSS6nDvhSpt6k6YzBbCtg8KeCX3Yf/4kAwKt4kTbt0v6YRY1EPzHPbevim EOizPYgiVxf9yB3NKjdkjITeiAAIs6mEWV1fSgiE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391682AbgBNQLA (ORCPT ); Fri, 14 Feb 2020 11:11:00 -0500 Received: from mail.kernel.org ([198.145.29.99]:35594 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391428AbgBNQKM (ORCPT ); Fri, 14 Feb 2020 11:10:12 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (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 60B8A24693; Fri, 14 Feb 2020 16:10:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581696612; bh=Izh1q7FxqCspuUufDA0SeKtC98zPn21rVDYFbOw+Fmk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ftdvZPPX5Bzqcy1tfgaKTPmxSaPC0ujQG69P5MR3fQ4vA8ioaU3MXIDfWxLeXzJmV q+dhDDRR9+X+MFOsa+ycg49Q2AmiCDpK6qfDet3tlfg4Iy42r6xHRebemJr8T+ZZ4P 9iwt99V+cXRBI6N6Ks+0lUCGWrJDDLzyCG0agiAY= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Lu Baolu , Frank , Joerg Roedel , Sasha Levin , iommu@lists.linux-foundation.org Subject: [PATCH AUTOSEL 5.4 395/459] iommu/vt-d: Remove unnecessary WARN_ON_ONCE() Date: Fri, 14 Feb 2020 11:00:45 -0500 Message-Id: <20200214160149.11681-395-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200214160149.11681-1-sashal@kernel.org> References: <20200214160149.11681-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Lu Baolu [ Upstream commit 857f081426e5aa38313426c13373730f1345fe95 ] Address field in device TLB invalidation descriptor is qualified by the S field. If S field is zero, a single page at page address specified by address [63:12] is requested to be invalidated. If S field is set, the least significant bit in the address field with value 0b (say bit N) indicates the invalidation address range. The spec doesn't require the address [N - 1, 0] to be cleared, hence remove the unnecessary WARN_ON_ONCE(). Otherwise, the caller might set "mask = MAX_AGAW_PFN_WIDTH" in order to invalidating all the cached mappings on an endpoint, and below overflow error will be triggered. [...] UBSAN: Undefined behaviour in drivers/iommu/dmar.c:1354:3 shift exponent 64 is too large for 64-bit type 'long long unsigned int' [...] Reported-and-tested-by: Frank Signed-off-by: Lu Baolu Signed-off-by: Joerg Roedel Signed-off-by: Sasha Levin --- drivers/iommu/dmar.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c index eecd6a4216672..7196cabafb252 100644 --- a/drivers/iommu/dmar.c +++ b/drivers/iommu/dmar.c @@ -1351,7 +1351,6 @@ void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 pfsid, struct qi_desc desc; if (mask) { - WARN_ON_ONCE(addr & ((1ULL << (VTD_PAGE_SHIFT + mask)) - 1)); addr |= (1ULL << (VTD_PAGE_SHIFT + mask - 1)) - 1; desc.qw1 = QI_DEV_IOTLB_ADDR(addr) | QI_DEV_IOTLB_SIZE; } else -- 2.20.1