[PATCH v2 13/20] KVM: PPC: Book3S HV: Page table construction and page faults for radix guests

[Paul Mackerras]

On Tue, Jan 31, 2017 at 07:58:57AM +1100, Michael Ellerman wrote:
> Paul Mackerras <paulus at ozlabs.org> writes:
> 
> > This adds the code to construct the second-level ("partition-scoped" in
> > architecturese) page tables for guests using the radix MMU.  Apart from
> > the PGD level, which is allocated when the guest is created, the rest
> > of the tree is all constructed in response to hypervisor page faults.
> >
> > As well as hypervisor page faults for missing pages, we also get faults
> > for reference/change (RC) bits needing to be set, as well as various
> > other error conditions.  For now, we only set the R or C bit in the
> > guest page table if the same bit is set in the host PTE for the
> > backing page.
> >
> > This code can take advantage of the guest being backed with either
> > transparent or ordinary 2MB huge pages, and insert 2MB page entries
> > into the guest page tables.  There is no support for 1GB huge pages
> > yet.
> > ---
> >  arch/powerpc/include/asm/kvm_book3s.h  |   8 +
> >  arch/powerpc/kvm/book3s.c              |   1 +
> >  arch/powerpc/kvm/book3s_64_mmu_hv.c    |   7 +-
> >  arch/powerpc/kvm/book3s_64_mmu_radix.c | 385 +++++++++++++++++++++++++++++++++
> >  arch/powerpc/kvm/book3s_hv.c           |  17 +-
> >  5 files changed, 415 insertions(+), 3 deletions(-)
> 
> You didn't sign-off this patch. I assume that's just an accident and
> will add it?

Oops, yes, just an oversight.  I'll add it.

Paul.