x86, xen: Suppress WP test on Xen

jsgf · H. Peter Anvin · commit d560bc61575e · 2009-08-25T21:10:32.000-07:00
Xen always runs on CPUs which properly support WP enforcement in
privileged mode, so there's no need to test for it.

This also works around a crash reported by Arnd Hannemann, though I
think its just a band-aid for that case.

Reported-by: Arnd Hannemann &lt;hannemann@nets.rwth-aachen.de&gt;
Signed-off-by: Jeremy Fitzhardinge &lt;jeremy.fitzhardinge@citrix.com&gt;
Acked-by: Pekka Enberg &lt;penberg@cs.helsinki.fi&gt;
Signed-off-by: H. Peter Anvin &lt;hpa@zytor.com&gt;
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
@@ -1059,6 +1059,7 @@ asmlinkage void __init xen_start_kernel(void)
 	/* set up basic CPUID stuff */
 	cpu_detect(&new_cpu_data);
 	new_cpu_data.hard_math = 1;
+	new_cpu_data.wp_works_ok = 1;
 	new_cpu_data.x86_capability[0] = cpuid_edx(1);
 #endif
 
