Single SAS Port Passthrough (Dual Port HBA)

[mhert]

Hello Guys.

Is it possible to passthroug the ports of a dual sas hba to two different vm's?

root@prox11:~# lspci -s 19:00.0 -v
19:00.0 Serial Attached SCSI controller: Broadcom / LSI SAS3008 PCI-Express Fusion-MPT SAS-3 (rev 02)
        Subsystem: Broadcom / LSI SAS9300-8e
        Flags: bus master, fast devsel, latency 0, IRQ 36, NUMA node 0, IOMMU group 8
        I/O ports at 5000 [disabled] [size=256]
        Memory at aae40000 (64-bit, non-prefetchable) [size=64K]
        Memory at aae00000 (64-bit, non-prefetchable) [size=256K]
        Expansion ROM at aad00000 [disabled] [size=1M]
        Capabilities: [50] Power Management version 3
        Capabilities: [68] Express Endpoint, MSI 00
        Capabilities: [a8] MSI: Enable- Count=1/1 Maskable+ 64bit+
        Capabilities: [c0] MSI-X: Enable+ Count=96 Masked-
        Capabilities: [100] Advanced Error Reporting
        Capabilities: [1e0] Secondary PCI Express
        Capabilities: [1c0] Power Budgeting <?>
        Capabilities: [190] Dynamic Power Allocation <?>
        Capabilities: [148] Alternative Routing-ID Interpretation (ARI)
        Kernel driver in use: vfio-pci
        Kernel modules: mpt3sas

 

[dcsapak]

do they report as different pci devices? if yes, are they in different iommu groups? if no to any of those questions, the i fear it's not possible.
you can "passthrough" the individual disks though, it's not as elegant, and you don't get direct access to the hw in the guest (so no smart, etc.) but should perform ok

 

[mhert]

thank you for reply.

there is only one device reported (19:00.0) but as i saw meanwhile it's an eight-port-controller (with two external connectors).

i want to attach an dual-partition tape library connected to the server with two sas-cables to two different vm's (no disks).

 

[leesteken]

You can passthrough attached drives (to separate VMs): https://pve.proxmox.com/wiki/Passthrough_Physical_Disk_to_Virtual_Machine_(VM)
Or passthrough the whole controller (to a single VM): https://pve.proxmox.com/wiki/PCI_Passthrough
Each way has it's pro and cons and especially the latter comes with a lot of caveats and does not always work.

 

[mhert]

thats in fact the status quo.

i have already passed the whole controller to a vm in my current setup.

but after partitioning (2) of the tape libray i want to pass each partition to a different vm...