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X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Hi, On 25/11/2025 12:01, Karolina Stolarek wrote: > Currently, the maximum number of targets is set and dictated > by virtio-scsi. On probe, the driver walks through all possible > targets to discover which of them are available. In the process, > it sends INQUIRY commands to request device information, also > querying devices that don't exist. This can be observed in > a guest with a single scsi-hd device and verbose SCSI logging > enabled: A gentle ping on this one. All the best, Karolina > > scsi 0:0:0:0: scsi scan: REPORT LUN scan > scsi 0:0:0:0: scsi scan: device exists on 0:0:0:0 > scsi 0:0:1:0: scsi scan: INQUIRY pass 1 length 36 > scsi 0:0:1:0: scsi scan: INQUIRY failed with code 0x40000 > (...) > scsi 0:0:255:0: scsi scan: INQUIRY pass 1 length 36 > scsi 0:0:255:0: scsi scan: INQUIRY failed with code 0x40000 > > In the vhost-scsi backend, without the kernel patch [1], the issue > is far more noticeable. Each command queued up for a non-existing > target triggers vq_error(), registered by > vhost_virtqueue_error_notifier(), resulting in a flood of > "vhost vring error in virtqueue X" messages when booting up a VM. > Even with the [1] patch in place, we are still sending commands > to phantom targets with no way of limiting the scan. The first > patch in the series addresses this issue by introducing "max_target" > property for virtio-scsi and vhost-scsi devices. A user gets > an option to specify how many targets are used by the guest, > and to stop scanning before hitting VIRTIO_SCSI_MAX_TARGET. > > A similar issue can be seen with Logical Units in the existing > devices. By default, the SCSI Host Adapter instance expects > 8 LUNs, and some drivers assume this to be the actual number > of exposed LUNs. This results in executing SCSI commands that > refer to non-existing Logical Units. This can be easily observed > when using vhost-scsi backend, as such messages appear in > the host's dmesg when booting up a guest: > > TARGET_CORE[vhost]: Detected NON_EXISTENT_LUN Access for 0x00000001 from > naa.5001405277e02c68 > TARGET_CORE[vhost]: Detected NON_EXISTENT_LUN Access for 0x00000002 from > naa.5001405277e02c68 > TARGET_CORE[vhost]: Detected NON_EXISTENT_LUN Access for 0x00000003 from > naa.5001405277e02c68 > TARGET_CORE[vhost]: Detected NON_EXISTENT_LUN Access for 0x00000004 from > naa.5001405277e02c68 > TARGET_CORE[vhost]: Detected NON_EXISTENT_LUN Access for 0x00000005 from > naa.5001405277e02c68 > TARGET_CORE[vhost]: Detected NON_EXISTENT_LUN Access for 0x00000006 from > naa.5001405277e02c68 > TARGET_CORE[vhost]: Detected NON_EXISTENT_LUN Access for 0x00000007 from > naa.5001405277e02c68 > > The second patch provides a way to say how many LUNs are actually > there by setting "max_lun" property in virtio-scsi and vhost-scsi > devices. If neither property is defined, max_target and max_lun are > set to the default values, making these definitions optional. > > ---------------------------- > [1] - > https://lore.kernel.org/virtualization/20250607171815.111030-1-michael.christie@oracle.com/T/#u > > Karolina Stolarek (2): > virtio-scsi: Make max_target value configurable > virtio-scsi: Make max_lun value configurable > > hw/scsi/vhost-scsi.c | 4 +++ > hw/scsi/virtio-scsi.c | 46 +++++++++++++++++++-------------- > include/hw/virtio/virtio-scsi.h | 2 ++ > 3 files changed, 33 insertions(+), 19 deletions(-) >