1 files changed, 44 insertions, 0 deletions
diff --git a/debian/patches/bugfix/x86/gds/x86-xen-fix-secondary-processors-fpu-initialization.patch b/debian/patches/bugfix/x86/gds/x86-xen-fix-secondary-processors-fpu-initialization.patch
new file mode 100644
index 000000000..658710bb5
--- /dev/null
+++ b/debian/patches/bugfix/x86/gds/x86-xen-fix-secondary-processors-fpu-initialization.patch
@@ -0,0 +1,44 @@
+From fe3e0a13e597c1c8617814bf9b42ab732db5c26e Mon Sep 17 00:00:00 2001
+From: Juergen Gross <jgross@suse.com>
+Date: Mon, 3 Jul 2023 15:00:32 +0200
+Subject: x86/xen: Fix secondary processors' FPU initialization
+
+From: Juergen Gross <jgross@suse.com>
+
+commit fe3e0a13e597c1c8617814bf9b42ab732db5c26e upstream.
+
+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
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ arch/x86/xen/smp_pv.c |    2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/arch/x86/xen/smp_pv.c
++++ b/arch/x86/xen/smp_pv.c
+@@ -27,6 +27,7 @@
+ #include <asm/desc.h>
+ #include <asm/pgtable.h>
+ #include <asm/cpu.h>
++#include <asm/fpu/internal.h>
+ 
+ #include <xen/interface/xen.h>
+ #include <xen/interface/vcpu.h>
+@@ -58,6 +59,7 @@ static void cpu_bringup(void)
+ 	int cpu;
+ 
+ 	cpu_init();
++	fpu__init_cpu();
+ 	touch_softlockup_watchdog();
+ 	preempt_disable();
+