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=unavailable 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 C06F5ECE587 for ; Tue, 1 Oct 2019 17:01:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8CD132054F for ; Tue, 1 Oct 2019 17:01:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569949317; bh=Z4oG9QERilkftSaQTqEjgGuTvYWP4lgxuvUNmfwFQVo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=XAOtXjgTBQjC2U00b9U9HIgYx1c/i5omd8/KeO7EpkCDuCb3XnHWI20RzEPxmu8tz kbRIjb6g8RAuk5fkLJdzTjBc0lncAMHxTbdMVO9VUamvTwyw0wEyU5aRsHkh0qnMv3 DwTyE/4VTQSAIOUAePswmxb+/TQPbYuBQY2hoQ4o= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730874AbfJARBp (ORCPT ); Tue, 1 Oct 2019 13:01:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:51412 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729530AbfJAQkO (ORCPT ); Tue, 1 Oct 2019 12:40:14 -0400 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 6F3D32190F; Tue, 1 Oct 2019 16:40:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569948014; bh=Z4oG9QERilkftSaQTqEjgGuTvYWP4lgxuvUNmfwFQVo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cZfMfSQRXEtIns/q0Irbk4qmI6AYlpSlaZClwF1vlUjYMutHBZ9HnyieRPUctTDcs CX4clo4aFi7muoDxFeLIg5gHUd3tv2TwfnpBN5sMnAv7RpF1Q8SFGZKSrVWtNVGuco 2jpVrLA7lgJMGJlLwZoqQMbVlvRPoH92lEx6tTM8= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Andrei Dulea , Sasha Levin , iommu@lists.linux-foundation.org Subject: [PATCH AUTOSEL 5.3 35/71] iommu/amd: Fix downgrading default page-sizes in alloc_pte() Date: Tue, 1 Oct 2019 12:38:45 -0400 Message-Id: <20191001163922.14735-35-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191001163922.14735-1-sashal@kernel.org> References: <20191001163922.14735-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Andrei Dulea [ Upstream commit 6ccb72f8374e17d60b58a7bfd5570496332c54e2 ] Downgrading an existing large mapping to a mapping using smaller page-sizes works only for the mappings created with page-mode 7 (i.e. non-default page size). Treat large mappings created with page-mode 0 (i.e. default page size) like a non-present mapping and allow to overwrite it in alloc_pte(). While around, make sure that we flush the TLB only if we change an existing mapping, otherwise we might end up acting on garbage PTEs. Fixes: 6d568ef9a622 ("iommu/amd: Allow downgrading page-sizes in alloc_pte()") Signed-off-by: Andrei Dulea Signed-off-by: Sasha Levin --- drivers/iommu/amd_iommu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index 61de81965c44e..0fb42a846404b 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -1490,6 +1490,7 @@ static u64 *alloc_pte(struct protection_domain *domain, pte_level = PM_PTE_LEVEL(__pte); if (!IOMMU_PTE_PRESENT(__pte) || + pte_level == PAGE_MODE_NONE || pte_level == PAGE_MODE_7_LEVEL) { page = (u64 *)get_zeroed_page(gfp); if (!page) @@ -1500,7 +1501,7 @@ static u64 *alloc_pte(struct protection_domain *domain, /* pte could have been changed somewhere. */ if (cmpxchg64(pte, __pte, __npte) != __pte) free_page((unsigned long)page); - else if (pte_level == PAGE_MODE_7_LEVEL) + else if (IOMMU_PTE_PRESENT(__pte)) domain->updated = true; continue; -- 2.20.1