Re: [PATCH 2/4] x86 paravirt_ops: paravirt_desc.h for native descriptor ops.
From: Andi Kleen
Date: Mon Aug 07 2006 - 01:38:20 EST
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.
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