KVM: PPC: Improve split mode

When in split mode, instruction relocation and data relocation are not equal.

So far we implemented this mode by reserving a special pseudo-VSID for the
two cases and flushing all PTEs when going into split mode, which is slow.

Unfortunately 32bit Linux and Mac OS X use split mode extensively. So to not
slow down things too much, I came up with a different idea: Mark the split
mode with a bit in the VSID and then treat it like any other segment.

This means we can just flush the shadow segment cache, but keep the PTEs
intact. I verified that this works with ppc32 Linux and Mac OS X 10.4
guests and does speed them up.

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

1 files changed, 13 insertions, 8 deletions

diff --git a/arch/powerpc/kvm/book3s_32_mmu.c b/arch/powerpc/kvm/book3s_32_mmu.c
index 33186b745c90..0b10503c8a4a 100644
--- a/arch/powerpc/kvm/book3s_32_mmu.c
+++ b/arch/powerpc/kvm/book3s_32_mmu.c
@@ -330,30 +330,35 @@ static void kvmppc_mmu_book3s_32_tlbie(struct kvm_vcpu *vcpu, ulong ea, bool lar
 static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
                                              u64 *vsid)
 {
+        ulong ea = esid << SID_SHIFT;
+        struct kvmppc_sr *sr;
+        u64 gvsid = esid;
+
+        if (vcpu->arch.msr & (MSR_DR|MSR_IR)) {
+                sr = find_sr(to_book3s(vcpu), ea);
+                if (sr->valid)
+                        gvsid = sr->vsid;
+        }
+
         /* In case we only have one of MSR_IR or MSR_DR set, let's put
            that in the real-mode context (and hope RM doesn't access
            high memory) */
         switch (vcpu->arch.msr & (MSR_DR|MSR_IR)) {
         case 0:
-                *vsid = (VSID_REAL >> 16) | esid;
+                *vsid = VSID_REAL | esid;
                 break;
         case MSR_IR:
-                *vsid = (VSID_REAL_IR >> 16) | esid;
+                *vsid = VSID_REAL_IR | gvsid;
                 break;
         case MSR_DR:
-                *vsid = (VSID_REAL_DR >> 16) | esid;
+                *vsid = VSID_REAL_DR | gvsid;
                 break;
         case MSR_DR|MSR_IR:
-        {
-                ulong ea = esid << SID_SHIFT;
-                struct kvmppc_sr *sr = find_sr(to_book3s(vcpu), ea);
-
                 if (!sr->valid)
                         return -1;
 
                 *vsid = sr->vsid;
                 break;
-        }
         default:
                 BUG();
         }