From nobody Mon Feb 9 19:54:11 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=quarantine dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1768297058; cv=none; d=zohomail.com; s=zohoarc; b=BdPBhYbXTkjHy54v8xwWO4448lqxy7VWxGGkzdmUBXKtXdK+78XyiPzLBavVJnQOIsLb9E0ubUL1olX7/cdeEHQGNiqludebsVjHdDirrv+ylU2g7VS592zlKiRRVvjtcSHHWi/8rxyh+bGk3NMY1JgrPGHpQ/jbxKtxPBzPQXM= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1768297058; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=YAAkMjBnQviAul+PLoRMDnmUXLCTqeSYmGEpKt8bFvo=; b=Kle2ow3U3WQe5H53CmkkSTISImplz20IDCLGU0rK3l2b7WrW3Aaaem4lSVFaLznlgZTnAeCv649F/ha22oQ/VjPlFRNC3ht1KopHGmSl0gPxLB7Q+NH3SDz8P7EPzEUpf9lMpNKAAKmiHy9+aAV15JbGWM+aTGoKup+SprOx3X8= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=quarantine dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1768297058742840.321594491629; Tue, 13 Jan 2026 01:37:38 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vfaq0-00075s-Lx; Tue, 13 Jan 2026 04:37:20 -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 1vfapy-00070Z-Nl for qemu-devel@nongnu.org; Tue, 13 Jan 2026 04:37:18 -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 1vfapx-0003Ja-5x for qemu-devel@nongnu.org; Tue, 13 Jan 2026 04:37:18 -0500 Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-131-N2dWqaezO2qsIr4-xrTfgg-1; Tue, 13 Jan 2026 04:37:13 -0500 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 0CF62195609E; Tue, 13 Jan 2026 09:37:12 +0000 (UTC) Received: from corto.redhat.com (unknown [10.44.32.79]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 5912530001A8; Tue, 13 Jan 2026 09:37:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1768297036; 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=YAAkMjBnQviAul+PLoRMDnmUXLCTqeSYmGEpKt8bFvo=; b=chvPSV45VacHaqQ0HnZO2Dv4WfZYCpCjC6T1vR7Ycj2XeamulVGJ7fXQT1hqe16Gu6Ob/9 hx1xr6EpcdzcuwRgpUYE3EFxnqxmN4a2PxPaHnciEODHQsvvvBrZNLKwRia2I9v8mr8S74 RNHP1Bu34FZHt2Zt8Zj9OOI6qdX3GOM= X-MC-Unique: N2dWqaezO2qsIr4-xrTfgg-1 X-Mimecast-MFC-AGG-ID: N2dWqaezO2qsIr4-xrTfgg_1768297032 From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= To: qemu-devel@nongnu.org Cc: Alex Williamson , Zhenzhong Duan , Nicolin Chen , Yi Liu , Eric Auger , "Michael S. Tsirkin" , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Subject: [PULL 10/41] vfio/iommufd: Force creating nesting parent HWPT Date: Tue, 13 Jan 2026 10:36:06 +0100 Message-ID: <20260113093637.1549214-11-clg@redhat.com> In-Reply-To: <20260113093637.1549214-1-clg@redhat.com> References: <20260113093637.1549214-1-clg@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=clg@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, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_PASS=-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: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1768297059514158500 From: Zhenzhong Duan Call pci_device_get_viommu_flags() to get if vIOMMU supports VIOMMU_FLAG_WANT_NESTING_PARENT. If yes, create a nesting parent HWPT and add it to the container's hwpt_lis= t, letting this parent HWPT cover the entire second stage mappings (GPA=3D>HPA= ). This allows a VFIO passthrough device to directly attach to this default HW= PT and then to use the system address space and its listener. Introduce a vfio_device_get_viommu_flags_want_nesting() helper to facilitate this implementation. It is safe to do so because a vIOMMU will be able to fail in set_iommu_devi= ce() call, if something else related to the VFIO device or vIOMMU isn't compatib= le. Suggested-by: Nicolin Chen Suggested-by: Yi Liu Signed-off-by: Zhenzhong Duan Reviewed-by: Nicolin Chen Reviewed-by: Eric Auger Reviewed-by: Yi Liu Reviewed-by: Michael S. Tsirkin Link: https://lore.kernel.org/qemu-devel/20260106061304.314546-9-zhenzhong.= duan@intel.com Signed-off-by: C=C3=A9dric Le Goater --- include/hw/vfio/vfio-device.h | 2 ++ hw/vfio/device.c | 12 ++++++++++++ hw/vfio/iommufd.c | 9 +++++++++ 3 files changed, 23 insertions(+) diff --git a/include/hw/vfio/vfio-device.h b/include/hw/vfio/vfio-device.h index 0fe6c60ba2d65b0ef5de5ef0c75c43cfa8e89352..0bc877ff62f9473d49782ce7c2e= e1eb943175821 100644 --- a/include/hw/vfio/vfio-device.h +++ b/include/hw/vfio/vfio-device.h @@ -257,6 +257,8 @@ void vfio_device_prepare(VFIODevice *vbasedev, VFIOCont= ainer *bcontainer, =20 void vfio_device_unprepare(VFIODevice *vbasedev); =20 +bool vfio_device_get_viommu_flags_want_nesting(VFIODevice *vbasedev); + int vfio_device_get_region_info(VFIODevice *vbasedev, int index, struct vfio_region_info **info); int vfio_device_get_region_info_type(VFIODevice *vbasedev, uint32_t type, diff --git a/hw/vfio/device.c b/hw/vfio/device.c index 19d1236ed750d482280225b1db3e4f5c13a39a89..100532f35d9ad14bf14c8d6d783= f7b06aa85245a 100644 --- a/hw/vfio/device.c +++ b/hw/vfio/device.c @@ -23,6 +23,7 @@ =20 #include "hw/vfio/vfio-device.h" #include "hw/vfio/pci.h" +#include "hw/core/iommu.h" #include "hw/core/hw-error.h" #include "trace.h" #include "qapi/error.h" @@ -515,6 +516,17 @@ void vfio_device_unprepare(VFIODevice *vbasedev) vbasedev->bcontainer =3D NULL; } =20 +bool vfio_device_get_viommu_flags_want_nesting(VFIODevice *vbasedev) +{ + VFIOPCIDevice *vdev =3D vfio_pci_from_vfio_device(vbasedev); + + if (vdev) { + return !!(pci_device_get_viommu_flags(PCI_DEVICE(vdev)) & + VIOMMU_FLAG_WANT_NESTING_PARENT); + } + return false; +} + /* * Traditional ioctl() based io */ diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c index 32e8615ad3b41bdbeb6426c2542f445d9f31f2f5..e5328c63a366076199015b25f55= d273b91a4327a 100644 --- a/hw/vfio/iommufd.c +++ b/hw/vfio/iommufd.c @@ -361,6 +361,15 @@ static bool iommufd_cdev_autodomains_get(VFIODevice *v= basedev, flags =3D IOMMU_HWPT_ALLOC_DIRTY_TRACKING; } =20 + /* + * If vIOMMU requests VFIO's cooperation to create nesting parent HWPT, + * force to create it so that it could be reused by vIOMMU to create + * nested HWPT. + */ + if (vfio_device_get_viommu_flags_want_nesting(vbasedev)) { + flags |=3D IOMMU_HWPT_ALLOC_NEST_PARENT; + } + if (cpr_is_incoming()) { hwpt_id =3D vbasedev->cpr.hwpt_id; goto skip_alloc; --=20 2.52.0