KVM: PPC: Add papr_enabled flag

When running a PAPR guest, some things change. The privilege level drops
from hypervisor to supervisor, SDR1 gets treated differently and we interpret
hypercalls. For bisectability sake, add the flag now, but only enable it when
all the support code is there.
Signed-off-by: Alexander Graf <agraf@suse.de>

arch/powerpc/include/asm/kvm_host.h

@@ -389,6 +389,7 @@ struct kvm_vcpu_arch {
 	u8 dcr_is_write;
 	u8 osi_needed;
 	u8 osi_enabled;
+	u8 papr_enabled;
 	u8 hcall_needed;
 
 	u32 cpr0_cfgaddr; /* holds the last set cpr0_cfgaddr */