Xen Gains PVSCSI Support With Linux 3.18 Kernel

Written by Michael Larabel in Virtualization on 10 October 2014 at 08:14 AM EDT. Add A Comment
Para-virtualized SCSI (pvSCSI) support comes to Xen virtualization with the Linux 3.18 kernel.

One of the main features for the Xen pull request submitted for the Linux 3.18 kernel are pvscsi front-end and back-end drivers. Xen's pvSCSI yields support to use physical SCSI devices from within a Xen domain. The back-end pvSCSI driver running in the Domain-0 does the majority of the I/O work while the front-end driver running from domU passes the requests to the pvSCSI driver back-end.

This pvSCSI support with the scsifront and scsiback modules is based on the original pvSCSI code written by Fujitsu during the Linux 2.6 days. Other Xen changes for Linux 3.18 include an attempt to keep memory contiguous during PV memory setup, allowing front/back drivers to use threaded IRqs, support for large initial RAM disk images (initrd) from PV guests, and fixes for PVH guests with the upcoming Xen 4.5.

More details on the Xen Linux 3.18 changes via this pull request.
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