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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 36CA4C4332F for ; Tue, 29 Nov 2022 08:11:38 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ozvhs-00073h-Ts; Tue, 29 Nov 2022 03:11:08 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ozvhf-0006zr-0x for qemu-devel@nongnu.org; Tue, 29 Nov 2022 03:10:56 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ozvhc-0006jj-Hk for qemu-devel@nongnu.org; Tue, 29 Nov 2022 03:10:53 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1669709451; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ypWya4vKeITotbnpLSe2AHaNL7GdsePh9BVNbHM3uns=; b=h6tAJnJTiH0PMH+RMAxQaSUNJ1bjzIbOr584FcVfNyFnx3crm2itIiLeosQkJP7XobIqN3 aqg9bVVP92eQYVTXL1NZbiRqdN+KKvxqG7/5KChQW7+ZWTW2B5Ux8mR3aad3vVZB7HTaYA ppJ5+5KtYpWXQivrv5iJQB6D+2x3LfM= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-665-eqPtaMNUNLGRaQzEazjusA-1; Tue, 29 Nov 2022 03:10:48 -0500 X-MC-Unique: eqPtaMNUNLGRaQzEazjusA-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 09728185A792; Tue, 29 Nov 2022 08:10:48 +0000 (UTC) Received: from localhost.localdomain (ovpn-13-181.pek2.redhat.com [10.72.13.181]) by smtp.corp.redhat.com (Postfix) with ESMTP id 39811C15BA4; Tue, 29 Nov 2022 08:10:43 +0000 (UTC) From: Jason Wang To: mst@redhat.com, peterx@redhat.com Cc: qemu-devel@nongnu.org, eric.auger@redhat.com, viktor@daynix.com, Jason Wang Subject: [PATCH 1/3] intel-iommu: fail MAP notifier without caching mode Date: Tue, 29 Nov 2022 16:10:35 +0800 Message-Id: <20221129081037.12099-2-jasowang@redhat.com> In-Reply-To: <20221129081037.12099-1-jasowang@redhat.com> References: <20221129081037.12099-1-jasowang@redhat.com> MIME-Version: 1.0 Content-type: text/plain Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 Received-SPF: pass client-ip=170.10.129.124; envelope-from=jasowang@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Without caching mode, MAP notifier won't work correctly since guest won't send IOTLB update event when it establishes new mappings in the I/O page tables. Let's fail the IOMMU notifiers early instead of misbehaving silently. Signed-off-by: Jason Wang --- hw/i386/intel_iommu.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c index a08ee85edf..9143376677 100644 --- a/hw/i386/intel_iommu.c +++ b/hw/i386/intel_iommu.c @@ -3186,6 +3186,13 @@ static int vtd_iommu_notify_flag_changed(IOMMUMemoryRegion *iommu, "Snoop Control with vhost or VFIO is not supported"); return -ENOTSUP; } + if (!s->caching_mode && (new & IOMMU_NOTIFIER_MAP)) { + error_setg_errno(errp, ENOTSUP, + "device %02x.%02x.%x requires caching mode", + pci_bus_num(vtd_as->bus), PCI_SLOT(vtd_as->devfn), + PCI_FUNC(vtd_as->devfn)); + return -ENOTSUP; + } /* Update per-address-space notifier flags */ vtd_as->notifier_flags = new; -- 2.25.1