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>

1 files changed, 4 insertions, 4 deletions

diff --git a/arch/powerpc/kvm/book3s_32_mmu.c b/arch/powerpc/kvm/book3s_32_mmu.c
index 0b10503c8a4a..3292d76101d2 100644
--- 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();