KVM: PPC: Deflect page write faults properly in kvmppc_st

When we have a page that we're not allowed to write to, xlate() will already
tell us -EPERM on lookup of that page. With the code as is we change it into
a "page missing" error which a guest may get confused about. Instead, just
tell the caller about the -EPERM directly.

This fixes Mac OS X guests when run with DCBZ32 emulation.

Signed-off-by: Alexander Graf <agraf@suse.de>

diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index bd75902..9624c56 100644 (file)
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -418,11 +418,13 @@ int kvmppc_st(struct kvm_vcpu *vcpu, ulong *eaddr, int size, void *ptr,
              bool data)
 {
        struct kvmppc_pte pte;
+       int r;
 
        vcpu->stat.st++;
 
-       if (kvmppc_xlate(vcpu, *eaddr, data, true, &pte))
-               return -ENOENT;
+       r = kvmppc_xlate(vcpu, *eaddr, data, true, &pte);
+       if (r < 0)
+               return r;
 
        *eaddr = pte.raddr;