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a="55981877" X-IronPort-AV: E=Sophos;i="6.16,348,1744095600"; d="scan'208";a="55981877" X-CSE-ConnectionGUID: f3/AOldyTL2kbSKUUcsjAQ== X-CSE-MsgGUID: 4SPOzT1kT4CtWmu1o5hmQQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.16,348,1744095600"; d="scan'208";a="162691130" From: Zhenzhong Duan To: qemu-devel@nongnu.org Cc: alex.williamson@redhat.com, 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, shameerali.kolothum.thodi@huawei.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 v4 04/20] vfio/iommufd: Force creating nested parent domain Date: Tue, 29 Jul 2025 05:20:26 -0400 Message-ID: <20250729092043.785836-5-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250729092043.785836-1-zhenzhong.duan@intel.com> References: <20250729092043.785836-1-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 client-ip=192.198.163.17; 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_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_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: 1753781097480116600 Content-Type: text/plain; charset="utf-8" Call pci_device_get_viommu_cap() to get if vIOMMU supports VIOMMU_CAP_HW_NE= STED, if yes, create nested parent domain which could be reused by vIOMMU to crea= te nested domain. It is safe because hw_caps & VIOMMU_CAP_HW_NESTED cannot be set yet because s->flts is forbidden until we support passthrough device with x-flts=3Don. Suggested-by: Nicolin Chen Suggested-by: Yi Liu Signed-off-by: Zhenzhong Duan Reviewed-by: Eric Auger --- hw/vfio/iommufd.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c index 48c590b6a9..61a548f13f 100644 --- a/hw/vfio/iommufd.c +++ b/hw/vfio/iommufd.c @@ -20,6 +20,7 @@ #include "trace.h" #include "qapi/error.h" #include "system/iommufd.h" +#include "hw/iommu.h" #include "hw/qdev-core.h" #include "hw/vfio/vfio-cpr.h" #include "system/reset.h" @@ -379,6 +380,19 @@ static bool iommufd_cdev_autodomains_get(VFIODevice *v= basedev, flags =3D IOMMU_HWPT_ALLOC_DIRTY_TRACKING; } =20 + /* + * If vIOMMU supports stage-1 translation, force to create nested pare= nt + * domain which could be reused by vIOMMU to create nested domain. + */ + if (vbasedev->type =3D=3D VFIO_DEVICE_TYPE_PCI) { + VFIOPCIDevice *vdev =3D container_of(vbasedev, VFIOPCIDevice, vbas= edev); + + hw_caps =3D pci_device_get_viommu_cap(&vdev->pdev); + if (hw_caps & VIOMMU_CAP_HW_NESTED) { + 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