• Contact: port-xen
• Duration estimate: 64 hours

Abstract: Dom0 is not SMP safe right now. The main culprits are the backend drivers for blk and netif (and possibly others, such as pciback)

Deliverables:

• SMP capable dom0

Implementation:

This involves extensive stress testing of the dom0 kernel for concurrency and SMP workloads. Locking in various backend and other drivers need to be reviewed, reworked and tested.

Interrupt paths need to be reviewed, and the interrupt handling code needs to be reworked, potentially. The current event code doesn't multiplex well on vcpus. This needs reinvestigation.

This is a test/debug heavy task, since MP issues can crop up in various unrelated parts of the kernel.