Siva, I'm curious to hear how you position this against the pvscsi effort going on in the Xen world. -- james s Siva Kodiganti wrote:
Hello Linux community, A Project page for Virt_HBA is created on source forge. https://sourceforge.net/projects/npivhba Project Virt_HBA is targeted for a providing patch for Linux kernels to provide set of scsi layer interfaces to aid Hypervisors in Linux to export Scsi Hosts to Guest VMs. Using these interfaces Hypervisors could export Scsi_Host of a virtual hba emulated by HBA hardware to Guest VMs. FC, and FCOE (may) have support for Nport Virtualization, a FW/HW mechanism to emulate multiple hbas(nports) using a single HBA HW. Qlogic, and Emulex have support for FC NPIV. With this mechanism, Hypervisor would be capable of mapping appropriate Guest VM's shost queuecommand to underlying NPIV host's queue_command, and other hostt relevant entry points(one to one mapping). This could also provide a means of security for luns exported through NPIV host to be visible for appropriate Guest OS, hiding from HostOS. Scsi Layer interfaces: Hypervisor's registration with scsi layer scsi_register_hypertt(xn_hostt, xsize); xsize is size of private structure maintained by hypervisor per npiv host. struct scsi_hyper_hostt xn_hostt { .hyp_module = "xn", .hyp_psize = size of( xhost); .hyp_alloc_vhost = xn_alloc_vhost, .hyp_add_vhost = xn_add_vhost, .hyp_remove_vhost = xn_remove_vhost, .hyp_trans_func = xn_trans_vhost, .hyp_async_notifier = xn_async_ntfr, .hyp_reboot_notifier = xn_reboot_ntfr, }; Scsi_Host { /* flag for FC or FCOE hw or fw hba virtulization */ unsigned virt_host:1; } scsi_alloc_host(), scsi_add_host(), and scsi_remove_host() interfaces notify registered hypervisor about FC/FCOE virtual Scsi_Host. scsi_alloc_host() would allocate private data area per scsi_host for registered hypervisors, which export to Guest VMs. Hypervisors uses these virtual hosts' lld driver hostt entry points to queue,abort,etc scsi commands to HBA driver directly bypassing Host BlK, SD layers. Thanks, Siva -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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