1 files changed, 5 insertions, 2 deletions

diff --git a/arch/powerpc/kvm/book3s_rtas.c b/arch/powerpc/kvm/book3s_rtas.c
index cf95cdef73c9..7a053157483b 100644
--- a/arch/powerpc/kvm/book3s_rtas.c
+++ b/arch/powerpc/kvm/book3s_rtas.c
@@ -213,8 +213,11 @@ int kvmppc_rtas_hcall(struct kvm_vcpu *vcpu)
         gpa_t args_phys;
         int rc;
 
-        /* r4 contains the guest physical address of the RTAS args */
-        args_phys = kvmppc_get_gpr(vcpu, 4);
+        /*
+         * r4 contains the guest physical address of the RTAS args
+         * Mask off the top 4 bits since this is a guest real address
+         */
+        args_phys = kvmppc_get_gpr(vcpu, 4) & KVM_PAM;
 
         rc = kvm_read_guest(vcpu->kvm, args_phys, &args, sizeof(args));
         if (rc)