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>
diff --git a/arch/powerpc/kvm/book3s_64_mmu_host.c b/arch/powerpc/kvm/book3s_64_mmu_host.c
index f2899b2..25bd4ed 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_host.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_host.c
@@ -257,16 +257,9 @@
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);