KVM: x86: lapic: Clean up find_highest_vector() and count_vectors()

find_highest_vector() and count_vectors():
 - Instead of using magic values, define and use proper macros.

find_highest_vector():
 - Remove likely() which is there only for historical reasons and not
   doing correct branch predictions anymore.  Using such heuristics
   to optimize this function is not worth it now.  Let CPUs predict
   things instead.

 - Stop checking word[0] separately.  This was only needed for doing
   likely() optimization.

 - Use for loop, not while, to iterate over the register array to make
   the code clearer.

Note that we actually confirmed that the likely() did wrong predictions
by inserting debug code.

Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
PPC: epapr: create define for return code value of success

Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
KVM: PPC: use definitions in epapr header for hcalls

Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
KVM: PPC: add pvinfo for hcall opcodes on e500mc/e5500

Signed-off-by: Liu Yu <yu.liu@freescale.com>
[stuart: factored this out from idle hcall support in host patch]
Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
KVM: PPC: Add support for ePAPR idle hcall in host kernel

And add a new flag definition in kvm_ppc_pvinfo to indicate
whether the host supports the EV_IDLE hcall.

Signed-off-by: Liu Yu <yu.liu@freescale.com>
[stuart.yoder@freescale.com: cleanup,fixes for conditions allowing idle]
Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
[agraf: fix typo]
Signed-off-by: Alexander Graf <agraf@suse.de>
KVM: PPC: ev_idle hcall support for e500 guests

Signed-off-by: Liu Yu <yu.liu@freescale.com>
[varun: 64-bit changes]
Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
PPC: select EPAPR_PARAVIRT for all users of epapr hcalls

Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
powerpc/fsl-soc: use CONFIG_EPAPR_PARAVIRT for hcalls

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
PPC: Don't use hardcoded opcode for ePAPR hcall invocation

Signed-off-by: Liu Yu <yu.liu@freescale.com>
Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
KVM: PPC: PR: Use generic tracepoint for guest exit

We want to have tracing information on guest exits for booke as well
as book3s. Since most information is identical, use a common trace point.

Signed-off-by: Alexander Graf <agraf@suse.de>
KVM: PPC: Expose SYNC cap based on mmu notifiers

Semantically, the "SYNC" cap means that we have mmu notifiers available.
Express this in our #ifdef'ery around the feature, so that we can be sure
we don't miss out on ppc targets when they get their implementation.

Signed-off-by: Alexander Graf <agraf@suse.de>
KVM: PPC: BookE: Expose remote TLB flushes in debugfs

We're already counting remote TLB flushes in a variable, but don't export
it to user space yet. Do so, so we know what's going on.

Signed-off-by: Alexander Graf <agraf@suse.de>
KVM: PPC: E500: Fix clear_tlb_refs

Our mapping code assumes that TLB0 entries are always mapped. However, after
calling clear_tlb_refs() this is no longer the case.

Map them dynamically if we find an entry unmapped in TLB0.

Signed-off-by: Alexander Graf <agraf@suse.de>
KVM: PPC: Quieten message about allocating linear regions

This is printed once for every RMA or HPT region that get
preallocated.  If one preallocates hundreds of such regions
(in order to run hundreds of KVM guests), that gets rather
painful, so make it a bit quieter.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
powerpc/epapr: export epapr_hypercall_start

This fixes breakage introduced by the following commit:

  commit 6d2d82627f4f1e96a33664ace494fa363e0495cb
  Author: Liu Yu-B13201 <Yu.Liu@freescale.com>
  Date:   Tue Jul 3 05:48:56 2012 +0000

    PPC: Don't use hardcoded opcode for ePAPR hcall invocation

when a driver that uses ePAPR hypercalls is built as a module.

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
KVM: PPC: BookE: Add check_requests helper function

We need a central place to check for pending requests in. Add one that
only does the timer check we already do in a different place.

Later, this central function can be extended by more checks.

Signed-off-by: Alexander Graf <agraf@suse.de>
KVM: PPC: BookE: Add support for vcpu->mode

Generic KVM code might want to know whether we are inside guest context
or outside. It also wants to be able to push us out of guest context.

Add support to the BookE code for the generic vcpu->mode field that describes
the above states.

Signed-off-by: Alexander Graf <agraf@suse.de>
KVM: PPC: E500: Implement MMU notifiers

The e500 target has lived without mmu notifiers ever since it got
introduced, but fails for the user space check on them with hugetlbfs.

So in order to get that one working, implement mmu notifiers in a
reasonably dumb fashion and be happy. On embedded hardware, we almost
never end up with mmu notifier calls, since most people don't overcommit.

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

---

v1 -> v2:

  - drop refcount for in-use pages
  - mark pages dirty at mapping time, not unmapping time
  - drop hva_to_memslot usage
KVM: PPC: BookE: Add some more trace points

Without trace points, debugging what exactly is going on inside guest
code can be very tricky. Add a few more trace points at places that
hopefully tell us more when things go wrong.

Signed-off-by: Alexander Graf <agraf@suse.de>
KVM: PPC: BookE: No duplicate request != 0 check

We only call kvmppc_check_requests() when vcpu->requests != 0, so drop
the redundant check in the function itself

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