Re: [PATCH 2/4] x86 paravirt_ops: paravirt_desc.h for native descriptor ops.

Andi Kleen
2006-08-07T05:40:31Z

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