KVM: PPC: Make BAT only guest segments work

When a guest sets its SR entry to invalid, we may still find a
corresponding entry in a BAT. So we need to make sure we're not
faulting on invalid SR entries, but instead just claim them to be
BAT resolved.

This resolves breakage experienced when using libogc based guests.

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

diff --git a/arch/powerpc/kvm/book3s_32_mmu.c b/arch/powerpc/kvm/book3s_32_mmu.c
index 0b10503..3292d76 100644 (file)
--- a/arch/powerpc/kvm/book3s_32_mmu.c
+++ b/arch/powerpc/kvm/book3s_32_mmu.c
@@ -354,10 +354,10 @@ static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
                *vsid = VSID_REAL_DR | gvsid;
                break;
        case MSR_DR|MSR_IR:
-               if (!sr->valid)
-                       return -1;
-
-               *vsid = sr->vsid;
+               if (sr->valid)
+                       *vsid = sr->vsid;
+               else
+                       *vsid = VSID_BAT | gvsid;
                break;
        default:
                BUG();