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Thu, 9 Nov 2023 22:57:32 +0000 (GMT) Message-ID: Date: Thu, 9 Nov 2023 17:57:32 -0500 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.15.1 Subject: Re: [PATCH v5 15/20] vfio/ccw: Allow the selection of a given iommu backend Content-Language: en-US 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, Eric Farman , Thomas Huth , "open list:vfio-ccw" References: <20231109114529.1904193-1-zhenzhong.duan@intel.com> <20231109114529.1904193-16-zhenzhong.duan@intel.com> From: Matthew Rosato In-Reply-To: <20231109114529.1904193-16-zhenzhong.duan@intel.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: XCfOYwk-LfaInO53vGHS0cj3G8wXuR7w X-Proofpoint-ORIG-GUID: b73okLd4qu2-fxMxWdNvU2OteCKFNAJ5 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=2023-11-09_16,2023-11-09_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 adultscore=0 priorityscore=1501 suspectscore=0 lowpriorityscore=0 mlxlogscore=891 bulkscore=0 impostorscore=0 malwarescore=0 clxscore=1015 mlxscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2311090168 Received-SPF: pass client-ip=148.163.156.1; envelope-from=mjrosato@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -52 X-Spam_score: -5.3 X-Spam_bar: ----- X-Spam_report: (-5.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-3.265, 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 11/9/23 6:45 AM, 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: > > If the user wants to use the legacy backend, it shall not > link the vfio-ccw device with any iommufd object: > > -device vfio-ccw,sysfsdev=/sys/bus/mdev/devices/XXX > > This is called the legacy mode/backend. > > If the user wants to use the iommufd backend (/dev/iommu) it > shall pass an iommufd object id in the vfio-ccw device options: > > -object iommufd,id=iommufd0 > -device vfio-ccw,sysfsdev=/sys/bus/mdev/devices/XXX,iommufd=iommufd0 > > Suggested-by: Alex Williamson > Signed-off-by: Zhenzhong Duan Reviewed-by: Matthew Rosato