On Monday 07 August 2006 06:45, Rusty Russell wrote:

Unfortunately, due to include cycles, we can't put these in
paravirt.h: we use a separate header for these.

The implementation comes from Zach's [RFC, PATCH 10/24] i386 Vmi descriptor changes:

  Descriptor and trap table cleanups.  Add cleanly written accessors for
  IDT and GDT gates so the subarch may override them.  Note that this
  allows the hypervisor to transparently tweak the DPL of the descriptors
  as well as the RPL of segments in those descriptors, with no unnecessary
  kernel code modification.  It also allows the hypervisor implementation
  of the VMI to tweak the gates, allowing for custom exception frames or
  extra layers of indirection above the guest fault / IRQ handlers.

Nice cleanup. The old assembly mess was ripe to be killed for a long time.

-Andi