[RFC PATCH 0/11] KVM: PPC: Update Book3S HV memory handling

[Alexander Graf]

On 16.11.2011, at 23:50, Paul Mackerras wrote:

> This series of patches updates the Book3S-HV KVM code that manages the
> guest hashed page table (HPT) to enable several things:
> 
> * MMIO emulation and MMIO pass-through
> 
> * Use of small pages (4kB or 64kB, depending on config) to back the
>  guest memory
> 
> * Pageable guest memory - i.e. backing pages can be removed from the
>  guest and reinstated on demand, using the MMU notifier mechanism.
> 
> On PPC970 we have no way to get DSIs and ISIs to come to the
> hypervisor, so we can't do MMIO emulation or pageable guest memory.
> On POWER7 we set the VPM1 bit in the LPCR to make all DSIs and ISIs
> come to the hypervisor (host) as HDSIs or HISIs.
> 
> This series is RFC for the moment, although the first 5 or so patches
> are pretty solid and could go in.  I am going to rework the later
> patches to use HPTEs with V=0 for the absent pages rather than key=31,
> which will require handling the HPTE-not-present HDSIs we will get and
> differentiating the case where the guest has created a HPTE but the
> underlying page is not resident from the case where the guest has
> created no HPTE for the address.

This touches areas that I'm sure non-PPC people would want to see as well. Could you please CC kvm at vger too next time?

Avi, Marcelo, mind to review some of the bits in this patch set? :)


Alex