From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Juergen Gross Date: Mon, 3 Jul 2023 15:00:32 +0200 Subject: [PATCH] x86/xen: Fix secondary processors' FPU initialization 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 Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Boris Ostrovsky Acked-by: Thomas Gleixner Link: https://lore.kernel.org/r/20230703130032.22916-1-jgross@suse.com (cherry picked from commit fe3e0a13e597c1c8617814bf9b42ab732db5c26e) CVE-2022-40982 Signed-off-by: Thadeu Lima de Souza Cascardo Acked-by: Roxana Nicolescu Acked-by: Stefan Bader Signed-off-by: Stefan Bader (cherry picked from commit 96617ee9a5943f6c58fa503257e18b191e84d117) Signed-off-by: Stoiko Ivanov --- arch/x86/xen/smp_pv.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/xen/smp_pv.c b/arch/x86/xen/smp_pv.c index 6175f2c5c822..e97bab7b0010 100644 --- a/arch/x86/xen/smp_pv.c +++ b/arch/x86/xen/smp_pv.c @@ -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! */