[xen staging] x86/traps: Introduce bsp_traps_reinit()

[patchbot@xxxxxxx]

commit be90b7a77f444892e8e9bd3d2024ecf04da05aaf
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Fri Aug 8 15:01:56 2025 +0100
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Thu Aug 14 21:49:27 2025 +0100

    x86/traps: Introduce bsp_traps_reinit()
    
    ... to abstract away updating the refereces to the old BSP stack.
    
    No functional change.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/include/asm/traps.h | 1 +
 xen/arch/x86/setup.c             | 6 +-----
 xen/arch/x86/traps-setup.c       | 9 +++++++++
 3 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/xen/arch/x86/include/asm/traps.h b/xen/arch/x86/include/asm/traps.h
index 7414420e57..6ae451d3fc 100644
--- a/xen/arch/x86/include/asm/traps.h
+++ b/xen/arch/x86/include/asm/traps.h
@@ -9,6 +9,7 @@
 
 void bsp_early_traps_init(void);
 void traps_init(void);
+void bsp_traps_reinit(void);
 void percpu_traps_init(void);
 
 extern unsigned int ler_msr;
diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index 64f02699e1..c8c408e024 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -902,11 +902,7 @@ static void __init noreturn reinit_bsp_stack(void)
     unsigned long *stack = (void*)(get_stack_bottom() & ~(STACK_SIZE - 1));
     int rc;
 
-    /* Update TSS and ISTs */
-    load_system_tables();
-
-    /* Update SYSCALL trampolines */
-    percpu_traps_init();
+    bsp_traps_reinit();
 
     stack_base[0] = stack;
 
diff --git a/xen/arch/x86/traps-setup.c b/xen/arch/x86/traps-setup.c
index 7713f427d3..99257bbb16 100644
--- a/xen/arch/x86/traps-setup.c
+++ b/xen/arch/x86/traps-setup.c
@@ -107,6 +107,15 @@ void __init traps_init(void)
     percpu_traps_init();
 }
 
+/*
+ * Re-initialise all state referencing the early-boot stack.
+ */
+void __init bsp_traps_reinit(void)
+{
+    load_system_tables();
+    percpu_traps_init();
+}
+
 /*
  * Set up per-CPU linkage registers for exception, interrupt and syscall
  * handling.
--
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