powerpc/xive: shutdown XIVE when kexec or kdump is performed

The hcall H_INT_RESET should be called to make sure XIVE is fully
reseted.

Signed-off-by: Cédric Le Goater <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>

arch/powerpc/platforms/pseries/kexec.c

···
 		}
 	}
 
-	if (xive_enabled())
+	if (xive_enabled()) {
 		xive_kexec_teardown_cpu(secondary);
-	else
+
+		if (!secondary)
+			xive_shutdown();
+	} else
 		xics_kexec_teardown_cpu(secondary);
 }