selftests/powerpc: Retry on host facility unavailable

TM test tm-unavailable must take into account aborts due to host aborting
a transactin because of a facility unavailable exception, just like it
already does for aborts on reschedules (TM_CAUSE_KVM_RESCHED).
Reported-by: Desnes A. Nunes do Rosario <desnesn@linux.ibm.com>
Tested-by: Desnes A. Nunes do Rosario <desnesn@linux.ibm.com>
Signed-off-by: Gustavo Romero <gromero@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1566341651-19747-1-git-send-email-gromero@linux.vnet.ibm.com

tools/testing/selftests/powerpc/tm/tm.h

@@ -55,7 +55,8 @@ static inline bool failure_is_unavailable(void)
 static inline bool failure_is_reschedule(void)
 {
 	if ((failure_code() & TM_CAUSE_RESCHED) == TM_CAUSE_RESCHED ||
-	    (failure_code() & TM_CAUSE_KVM_RESCHED) == TM_CAUSE_KVM_RESCHED)
+	    (failure_code() & TM_CAUSE_KVM_RESCHED) == TM_CAUSE_KVM_RESCHED ||
+	    (failure_code() & TM_CAUSE_KVM_FAC_UNAV) == TM_CAUSE_KVM_FAC_UNAV)
 		return true;
 
 	return false;