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Wed, 15 Nov 2023 18:45:40 +0000 (GMT) Message-ID: Subject: Re: [PATCH v6 16/21] vfio/ccw: Allow the selection of a given iommu backend From: Eric Farman To: Zhenzhong Duan , qemu-devel@nongnu.org Cc: alex.williamson@redhat.com, clg@redhat.com, jgg@nvidia.com, nicolinc@nvidia.com, joao.m.martins@oracle.com, eric.auger@redhat.com, peterx@redhat.com, jasowang@redhat.com, kevin.tian@intel.com, yi.l.liu@intel.com, yi.y.sun@intel.com, chao.p.peng@intel.com, Matthew Rosato , Thomas Huth , "open list:vfio-ccw" Date: Wed, 15 Nov 2023 13:45:39 -0500 In-Reply-To: <20231114100955.1961974-17-zhenzhong.duan@intel.com> References: <20231114100955.1961974-1-zhenzhong.duan@intel.com> <20231114100955.1961974-17-zhenzhong.duan@intel.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.48.4 (3.48.4-1.fc38) MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: uZUiyPA5k7tTbDBCW8chzDzx5FbwDUqY X-Proofpoint-GUID: jH8XjCwU2CaW9eNk8KAPTl2NDYBknaoO X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.987,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-11-15_18,2023-11-15_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 spamscore=0 clxscore=1011 mlxscore=0 lowpriorityscore=0 impostorscore=0 mlxlogscore=967 adultscore=0 priorityscore=1501 phishscore=0 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2311150147 Received-SPF: pass client-ip=148.163.156.1; envelope-from=farman@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Tue, 2023-11-14 at 18:09 +0800, Zhenzhong Duan wrote: > Now we support two types of iommu backends, let's add the capability > to select one of them. This depends on whether an iommufd object has > been linked with the vfio-ccw device: >=20 > If the user wants to use the legacy backend, it shall not > link the vfio-ccw device with any iommufd object: >=20 > =C2=A0-device vfio-ccw,sysfsdev=3D/sys/bus/mdev/devices/XXX >=20 > This is called the legacy mode/backend. >=20 > If the user wants to use the iommufd backend (/dev/iommu) it > shall pass an iommufd object id in the vfio-ccw device options: >=20 > =C2=A0-object iommufd,id=3Diommufd0 > =C2=A0-device vfio-ccw,sysfsdev=3D/sys/bus/mdev/devices/XXX,iommufd=3Diom= mufd0 >=20 > Suggested-by: Alex Williamson > Signed-off-by: Zhenzhong Duan > Reviewed-by: Matthew Rosato > --- > =C2=A0hw/vfio/ccw.c | 6 ++++++ > =C2=A01 file changed, 6 insertions(+) Reviewed-by: Eric Farman