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a="761646713" X-IronPort-AV: E=Sophos;i="6.05,211,1701158400"; d="scan'208";a="761646713" From: Zhenzhong Duan To: qemu-devel@nongnu.org, qemu-arm@nongnu.org Cc: eric.auger@redhat.com, jean-philippe@linaro.org, alex.williamson@redhat.com, clg@redhat.com, peterx@redhat.com, jasowang@redhat.com, mst@redhat.com, yi.l.liu@intel.com, chao.p.peng@intel.com, Zhenzhong Duan Subject: [PATCH 3/3] virtio-iommu: Support PCI device aliases Date: Mon, 22 Jan 2024 14:40:15 +0800 Message-Id: <20240122064015.94630-4-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240122064015.94630-1-zhenzhong.duan@intel.com> References: <20240122064015.94630-1-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=198.175.65.11; envelope-from=zhenzhong.duan@intel.com; helo=mgamail.intel.com X-Spam_score_int: -33 X-Spam_score: -3.4 X-Spam_bar: --- X-Spam_report: (-3.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.287, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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: 1705905843488100001 Content-Type: text/plain; charset="utf-8" Currently virtio-iommu doesn't work well if there are multiple devices in same iommu group. In below example config, guest virtio-iommu driver can successfully probe first device but fail on others. Only one device under the bridge can work normally. -device virtio-iommu \ -device pcie-pci-bridge,id=3Droot0 \ -device vfio-pci,host=3D81:11.0,bus=3Droot0 \ -device vfio-pci,host=3D6f:01.0,bus=3Droot0 \ The reason is virtio-iommu stores AS(address space) in hash table with aliased BDF and corelates endpoint which is indexed by device's real BDF, i.e., virtio_iommu_mr() is passed a real BDF to lookup AS hash table, we either get wrong AS or NULL. Fix it by storing AS indexed by real BDF. This way also make iova_ranges from vfio device stored in IOMMUDevice of real BDF successfully. Signed-off-by: Zhenzhong Duan --- hw/virtio/virtio-iommu.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c index d99c1f0d64..6880d92a44 100644 --- a/hw/virtio/virtio-iommu.c +++ b/hw/virtio/virtio-iommu.c @@ -399,27 +399,27 @@ static AddressSpace *virtio_iommu_find_add_as(PCIBus = *bus, void *opaque, int real_devfn) { VirtIOIOMMU *s =3D opaque; - IOMMUPciBus *sbus =3D g_hash_table_lookup(s->as_by_busptr, bus); + IOMMUPciBus *sbus =3D g_hash_table_lookup(s->as_by_busptr, real_bus); static uint32_t mr_index; IOMMUDevice *sdev; =20 if (!sbus) { sbus =3D g_malloc0(sizeof(IOMMUPciBus) + sizeof(IOMMUDevice *) * PCI_DEVFN_MAX); - sbus->bus =3D bus; - g_hash_table_insert(s->as_by_busptr, bus, sbus); + sbus->bus =3D real_bus; + g_hash_table_insert(s->as_by_busptr, real_bus, sbus); } =20 - sdev =3D sbus->pbdev[devfn]; + sdev =3D sbus->pbdev[real_devfn]; if (!sdev) { char *name =3D g_strdup_printf("%s-%d-%d", TYPE_VIRTIO_IOMMU_MEMORY_REGION, - mr_index++, devfn); - sdev =3D sbus->pbdev[devfn] =3D g_new0(IOMMUDevice, 1); + mr_index++, real_devfn); + sdev =3D sbus->pbdev[real_devfn] =3D g_new0(IOMMUDevice, 1); =20 sdev->viommu =3D s; - sdev->bus =3D bus; - sdev->devfn =3D devfn; + sdev->bus =3D real_bus; + sdev->devfn =3D real_devfn; =20 trace_virtio_iommu_init_iommu_mr(name); =20 --=20 2.34.1