Re: [RFC] ARM: New (Xen) VGIC design document

[Andre Przywara <andre.przywara@arm.com>]

Hi,

On 11/10/17 15:33, Andre Przywara wrote:
> Hi,
> 
> (CC:ing some KVM/ARM folks involved in the VGIC)
> 
> starting with the addition of the ITS support we were seeing more and
> more issues with the current implementation of our ARM Generic Interrupt
> Controller (GIC) emulation, the VGIC.
> Among other approaches to fix those issues it was proposed to copy the
> VGIC emulation used in KVM. This one was suffering from very similar
> issues, and a clean design from scratch lead to a very robust and
> capable re-implementation. Interestingly this implementation is fairly
> self-contained, so it seems feasible to copy it. Hopefully we only need
> minor adjustments, possibly we can even copy it verbatim with some
> additional glue layer code.
> Stefano asked for getting a design overview, to assess the feasibility
> of copying the KVM code without reviewing tons of code in the first
> place.
> So to follow Xen rules for new features, this design document below is
> an attempt to describe the current KVM VGIC design - in a hypervisor
> agnostic session. It is a bit of a retro-fit design description, as it
> is not strictly forward-looking only, but actually describing the
> existing implemenation [1].

and that link should point to:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/virt/kvm/arm/vgic

Cheers,
Andre.

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