From nobody Mon Feb 9 20:12:43 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass header.i=@intel.com; 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=none dis=none) header.from=intel.com ARC-Seal: i=1; a=rsa-sha256; t=1767680180; cv=none; d=zohomail.com; s=zohoarc; b=MfMaVSmOqKd7y19e4JH/0aeIqk8z6JMpTAXy+pRMr+c1al2hFl1X8D3Vj7gFCx14bQf5xvdjNsp22rzf9mHxDfO1PV426cPcThO4vOLIPDV6oWQHUm57e7F217ybs/rGRaihQ5YBfM4ujXR0L2tJM069Im/tiZZ6ci4sMNead6o= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1767680180; h=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=qe5tJWU34hEfalYuv6YRUX20L1BrSPuFVn42xR8fjTA=; b=dFmSC5V4kJ801v3jArde5WKeik5dGZjwMXr8OpoxJuaN6Y0oV01J8Pdffe7JYbbE0KxXVfOMy78r18dcsbNXp3t6RNhtxeHdnyap9m1jY9MsgzDT+rAH9oKUD+LjwcUJAY615ohtppH5zp78MXuZAwX8PLHZYBXsjYo3GJdQgak= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=@intel.com; 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=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1767680180587575.2509426617017; Mon, 5 Jan 2026 22:16:20 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vd0KO-0003HS-GQ; Tue, 06 Jan 2026 01:14:00 -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 1vd0KG-0003A4-Kt for qemu-devel@nongnu.org; Tue, 06 Jan 2026 01:13:54 -0500 Received: from mgamail.intel.com ([192.198.163.14]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vd0KE-0007Gj-V4 for qemu-devel@nongnu.org; Tue, 06 Jan 2026 01:13:52 -0500 Received: from orviesa007.jf.intel.com ([10.64.159.147]) by fmvoesa108.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Jan 2026 22:13:50 -0800 Received: from unknown (HELO gnr-sp-2s-612.sh.intel.com) ([10.112.230.229]) by orviesa007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Jan 2026 22:13:46 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1767680031; x=1799216031; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=J5HDqWz5aaK4UzxwydzsRBgK0fjr3xB7FJS1wmVdgjw=; b=R7Nk0e+6TrulSQG1TAb26paubZyYIHHFIvuyVEztlAWtIHf/FazIpwVQ wTaRSsRv+97Bzq6MDY/CF52t6xBL3wnZHZxuvXtiBNhL1Y6z6ERbDeEY/ amLlc8k8leF7MrmXevtNqNdcKyuSnyJx0XkqH+R8gyyOsglgmmks+fCNY TijV2Ioct93vo6I4Vxp2kxgKB46SimB39GizBTV6j8kEG8PwBfcWJIjhE TZ/MF7Wtq3nWpnk/6xwUCbXUG250T/IEWKpEZbmgpzEjuRkZM0DDA3FoF l8Jv282fQluNiYaV8+N6gjVDGfj2WlRmQryDbjCDioWIo8W8TaBAT9GNc Q==; X-CSE-ConnectionGUID: 6J52yZrlQr+mhJs31BqzJQ== X-CSE-MsgGUID: sVMudZ+0TQWt+YWqcmMKwg== X-IronPort-AV: E=McAfee;i="6800,10657,11662"; a="69087610" X-IronPort-AV: E=Sophos;i="6.21,204,1763452800"; d="scan'208";a="69087610" X-CSE-ConnectionGUID: brz75TfMSgabpZoJcmKRKw== X-CSE-MsgGUID: I7O6nP8sTdKX6RniOsOcjw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,204,1763452800"; d="scan'208";a="202588781" From: Zhenzhong Duan To: qemu-devel@nongnu.org Cc: alex@shazbot.org, clg@redhat.com, eric.auger@redhat.com, mst@redhat.com, jasowang@redhat.com, peterx@redhat.com, ddutile@redhat.com, jgg@nvidia.com, nicolinc@nvidia.com, skolothumtho@nvidia.com, joao.m.martins@oracle.com, clement.mathieu--drif@eviden.com, kevin.tian@intel.com, yi.l.liu@intel.com, chao.p.peng@intel.com, Zhenzhong Duan Subject: [PATCH v10 08/19] vfio/iommufd: Force creating nesting parent HWPT Date: Tue, 6 Jan 2026 01:12:50 -0500 Message-ID: <20260106061304.314546-9-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20260106061304.314546-1-zhenzhong.duan@intel.com> References: <20260106061304.314546-1-zhenzhong.duan@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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=192.198.163.14; envelope-from=zhenzhong.duan@intel.com; helo=mgamail.intel.com X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 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_MED=-2.3, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @intel.com) X-ZM-MESSAGEID: 1767680182022158500 Content-Type: text/plain; charset="utf-8" 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 --- 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 0fe6c60ba2..0bc877ff62 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 19d1236ed7..100532f35d 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 32e8615ad3..e5328c63a3 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 2.47.1