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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B284EC433F5 for ; Fri, 6 May 2022 05:31:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1389229AbiEFFep (ORCPT ); Fri, 6 May 2022 01:34:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40372 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1389203AbiEFFeU (ORCPT ); Fri, 6 May 2022 01:34:20 -0400 Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 542B01C93D for ; Thu, 5 May 2022 22:30:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1651815038; x=1683351038; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Ss1Py9xKSsfOz68o9vHCUmEfR+D8C1SL1jYJcqrSmD8=; b=mUY6qGhs97Jozf3aJ/5CogctJ77C81mKQXjIsS+p+Cw8FZ3CWlyZt6Kd Y4XdWRpxvrj++Tusz8E9JBZ6U9d3zOa7JIjBPyZT6RGZqV+AXn2Xo0q8a FgfbtJXOoPDSJbn6AKf859PMZLFtNlWXifjgwfoB9rKHA5AUNMbqamgMr 2fvHo96BSc0qhiZ4ikiPSeuyrMVeGdbOSbXDBo/oF1qyGpLrg+p4CfW9R buFSmpFJdc2kQqFOPt3M/sEl+zEhWG7Ib5qlOL2Js+gu+VckPGoz1TFyY aY/mfmG7nNDhyJ/c1d7H1SnDqQVaTNSfo5klWMCZA4N3ogn9MNiZtIcni g==; X-IronPort-AV: E=McAfee;i="6400,9594,10338"; a="255838473" X-IronPort-AV: E=Sophos;i="5.91,203,1647327600"; d="scan'208";a="255838473" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 May 2022 22:30:29 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.91,203,1647327600"; d="scan'208";a="695011051" Received: from allen-box.sh.intel.com ([10.239.159.48]) by orsmga004.jf.intel.com with ESMTP; 05 May 2022 22:30:26 -0700 From: Lu Baolu To: Joerg Roedel , Jason Gunthorpe , Alex Williamson , Kevin Tian Cc: Jacob jun Pan , Liu Yi L , iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Lu Baolu Subject: [PATCH v3 1/4] iommu/vt-d: Block force-snoop domain attaching if no SC support Date: Fri, 6 May 2022 13:27:24 +0800 Message-Id: <20220506052727.1689687-2-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220506052727.1689687-1-baolu.lu@linux.intel.com> References: <20220506052727.1689687-1-baolu.lu@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In the attach_dev callback of the default domain ops, if the domain has been set force_snooping, but the iommu hardware of the device does not support SC(Snoop Control) capability, the callback should block it and return a corresponding error code. Signed-off-by: Lu Baolu Reviewed-by: Jason Gunthorpe Reviewed-by: Kevin Tian --- drivers/iommu/intel/iommu.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 2990f80c5e08..b4802f4055a0 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -4367,6 +4367,9 @@ static int prepare_domain_attach_device(struct iommu_domain *domain, if (!iommu) return -ENODEV; + if (dmar_domain->force_snooping && !ecap_sc_support(iommu->ecap)) + return -EOPNOTSUPP; + /* check if this iommu agaw is sufficient for max mapped address */ addr_width = agaw_to_width(iommu->agaw); if (addr_width > cap_mgaw(iommu->cap)) -- 2.25.1