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=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS 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 EC533C3A59F for ; Thu, 29 Aug 2019 09:04:07 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id C3826215EA for ; Thu, 29 Aug 2019 09:04:07 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C3826215EA Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:47060 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i3GLe-0003d6-9r for qemu-devel@archiver.kernel.org; Thu, 29 Aug 2019 05:04:06 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:33185) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i3GJd-0001ra-18 for qemu-devel@nongnu.org; Thu, 29 Aug 2019 05:02:02 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1i3GJb-00011H-Nt for qemu-devel@nongnu.org; Thu, 29 Aug 2019 05:02:00 -0400 Received: from mx1.redhat.com ([209.132.183.28]:47510) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1i3GJZ-0000xx-13; Thu, 29 Aug 2019 05:01:57 -0400 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 4ED8186E86F; Thu, 29 Aug 2019 09:01:56 +0000 (UTC) Received: from laptop.redhat.com (ovpn-116-105.ams2.redhat.com [10.36.116.105]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2505D1001938; Thu, 29 Aug 2019 09:01:53 +0000 (UTC) From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, peter.maydell@linaro.org, pbonzini@redhat.com, alex.williamson@redhat.com Date: Thu, 29 Aug 2019 11:01:40 +0200 Message-Id: <20190829090141.21821-2-eric.auger@redhat.com> In-Reply-To: <20190829090141.21821-1-eric.auger@redhat.com> References: <20190829090141.21821-1-eric.auger@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.68]); Thu, 29 Aug 2019 09:01:56 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v5 1/2] memory: Add IOMMU_ATTR_NEED_HW_NESTED_PAGING IOMMU memory region attribute X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: aik@ozlabs.ru, peterx@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" We introduce a new IOMMU Memory Region attribute, IOMMU_ATTR_NEED_HW_NESTED_PAGING that tells whether the virtual IOMMU relies on physical IOMMU HW nested paging capability when protecting host assigned devices. Current Intel virtual IOMMU device supports "Caching Mode" and does not require 2 stages at physical level to be integrated with VFIO. However SMMUv3 does not implement such "caching mode" and requires HW nested paging. As such SMMUv3 is the first IOMMU device to advertise this attribute. This new attribute will allow the VFIO code to specialize its handling. Signed-off-by: Eric Auger --- v4 -> v5: - patches 1, 4, 5 were upstreamed separately - s/IOMMU_ATTR_HW_NESTED_PAGING/IOMMU_ATTR_NEED_HW_NESTED_PAGING v3 -> v4: - s/IOMMU_ATTR_VFIO_NESTED/IOMMU_ATTR_HW_NESTED_PAGING - add comments related to the existing attributes - fix space after the cast --- hw/arm/smmuv3.c | 12 ++++++++++++ include/exec/memory.h | 8 +++++++- 2 files changed, 19 insertions(+), 1 deletion(-) diff --git a/hw/arm/smmuv3.c b/hw/arm/smmuv3.c index 2eaf07fb5f..a932bf7136 100644 --- a/hw/arm/smmuv3.c +++ b/hw/arm/smmuv3.c @@ -1490,6 +1490,17 @@ static void smmuv3_notify_flag_changed(IOMMUMemory= Region *iommu, } } =20 +static int smmuv3_get_attr(IOMMUMemoryRegion *iommu, + enum IOMMUMemoryRegionAttr attr, + void *data) +{ + if (attr =3D=3D IOMMU_ATTR_NEED_HW_NESTED_PAGING) { + *(bool *)data =3D true; + return 0; + } + return -EINVAL; +} + static void smmuv3_iommu_memory_region_class_init(ObjectClass *klass, void *data) { @@ -1497,6 +1508,7 @@ static void smmuv3_iommu_memory_region_class_init(O= bjectClass *klass, =20 imrc->translate =3D smmuv3_translate; imrc->notify_flag_changed =3D smmuv3_notify_flag_changed; + imrc->get_attr =3D smmuv3_get_attr; } =20 static const TypeInfo smmuv3_type_info =3D { diff --git a/include/exec/memory.h b/include/exec/memory.h index fddc2ff48a..61493633fa 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -212,7 +212,13 @@ typedef struct MemoryRegionClass { =20 =20 enum IOMMUMemoryRegionAttr { - IOMMU_ATTR_SPAPR_TCE_FD + /* Retrieve an integer corresponding to the TCE file descriptor */ + IOMMU_ATTR_SPAPR_TCE_FD, + /* + * Retrieve a boolean that indicates whether the virtual IOMMU relie= s + * on physical IOMMU HW nested paging to protect host assigned devic= es + */ + IOMMU_ATTR_NEED_HW_NESTED_PAGING, }; =20 /** --=20 2.20.1