KVM: PPC: BOOK3S: HV: Update compute_tlbie_rb to handle 16MB base page

When calculating the lower bits of AVA field, use the shift
count based on the base page size. Also add the missing segment
size and remove stale comment.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
KVM: PPC: Implement kvmppc_xlate for all targets

We have a nice API to find the translated GPAs of a GVA including protection
flags. So far we only use it on Book3S, but there's no reason the same shouldn't
be used on BookE as well.

Implement a kvmppc_xlate() version for BookE and clean it up to make it more
readable in general.

Signed-off-by: Alexander Graf <agraf@suse.de>
KVM: PPC: Move kvmppc_ld/st to common code

We have enough common infrastructure now to resolve GVA->GPA mappings at
runtime. With this we can move our book3s specific helpers to load / store
in guest virtual address space to common code as well.

Signed-off-by: Alexander Graf <agraf@suse.de>
KVM: PPC: Remove kvmppc_bad_hva()

We have a proper define for invalid HVA numbers. Use those instead of the
ppc specific kvmppc_bad_hva().

Signed-off-by: Alexander Graf <agraf@suse.de>
KVM: PPC: Use kvm_read_guest in kvmppc_ld

We have a nice and handy helper to read from guest physical address space,
so we should make use of it in kvmppc_ld as we already do for its counterpart
in kvmppc_st.

Signed-off-by: Alexander Graf <agraf@suse.de>
KVM: PPC: Handle magic page in kvmppc_ld/st

We use kvmppc_ld and kvmppc_st to emulate load/store instructions that may as
well access the magic page. Special case it out so that we can properly access
it.

Signed-off-by: Alexander Graf <agraf@suse.de>
KVM: PPC: Separate loadstore emulation from priv emulation

Today the instruction emulator can get called via 2 separate code paths. It
can either be called by MMIO emulation detection code or by privileged
instruction traps.

This is bad, as both code paths prepare the environment differently. For MMIO
emulation we already know the virtual address we faulted on, so instructions
there don't have to actually fetch that information.

Split out the two separate use cases into separate files.

Signed-off-by: Alexander Graf <agraf@suse.de>
KVM: PPC: Expose helper functions for data/inst faults

We're going to implement guest code interpretation in KVM for some rare
corner cases. This code needs to be able to inject data and instruction
faults into the guest when it encounters them.

Expose generic APIs to do this in a reasonably subarch agnostic fashion.

Signed-off-by: Alexander Graf <agraf@suse.de>