x86/xen: Fix secondary processors' FPU initialization
authorJuergen Gross <jgross@suse.com>
Mon, 3 Jul 2023 13:00:32 +0000 (15:00 +0200)
committerBorislav Petkov (AMD) <bp@alien8.de>
Wed, 5 Jul 2023 09:44:16 +0000 (11:44 +0200)
Moving the call of fpu__init_cpu() from cpu_init() to start_secondary()
broke Xen PV guests, as those don't call start_secondary() for APs.

Call fpu__init_cpu() in Xen's cpu_bringup(), which is the Xen PV
replacement of start_secondary().

Fixes: b81fac906a8f ("x86/fpu: Move FPU initialization into arch_cpu_finalize_init()")
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230703130032.22916-1-jgross@suse.com
arch/x86/xen/smp_pv.c

index a9cf8c8..0b6efc4 100644 (file)
@@ -63,6 +63,7 @@ static void cpu_bringup(void)
 
        cr4_init();
        cpu_init();
+       fpu__init_cpu();
        touch_softlockup_watchdog();
 
        /* PVH runs in ring 0 and allows us to do native syscalls. Yay! */