KVM: PPC: Enable use of secondary htab bucket

We had code to make use of the secondary htab buckets, but kept that
disabled because it was unstable when I put it in.

I checked again if that's still the case and apparently it was only
exposing some instability that was there anyways before. I haven't
seen any badness related to usage of secondary htab entries so far.

This should speed up guest memory allocations by quite a bit, because
we now have more space to put PTEs in.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 1 insertions, 8 deletions

diff --git a/arch/powerpc/kvm/book3s_64_mmu_host.c b/arch/powerpc/kvm/book3s_64_mmu_host.c
index f2899b297ffd..25bd4ede722c 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_host.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_host.c
@@ -257,16 +257,9 @@ map_again:
 
         if (ret < 0) {
                 /* If we couldn't map a primary PTE, try a secondary */
-#ifdef USE_SECONDARY
                 hash = ~hash;
+                vflags ^= HPTE_V_SECONDARY;
                 attempt++;
-                if (attempt % 2)
-                        vflags = HPTE_V_SECONDARY;
-                else
-                        vflags = 0;
-#else
-                attempt = 2;
-#endif
                 goto map_again;
         } else {
                 int hpte_id = kvmppc_mmu_hpte_cache_next(vcpu);