From 7d5781d526fb56f4858e9d9ac38e8867ab178a68 Mon Sep 17 00:00:00 2001
From: Frediano Ziglio <frediano.ziglio@cloud.com>
Date: Mon, 11 Nov 2024 13:28:23 +0000
Subject: [PATCH] x86/boot: Setup correctly fs segment for bogus_real_magic

bogus_real_magic code uses fs segment so it should be initialised.

Fixes: d8c8fef09054 ("Provide basic Xen PM infrastructure")
Signed-off-by: Frediano Ziglio <frediano.ziglio@cloud.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
---
 xen/arch/x86/boot/wakeup.S | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/boot/wakeup.S b/xen/arch/x86/boot/wakeup.S
index c929fe9218..df5ea24457 100644
--- a/xen/arch/x86/boot/wakeup.S
+++ b/xen/arch/x86/boot/wakeup.S
@@ -77,8 +77,11 @@ check_vesaw:
         ret
 
 bogus_real_magic:
+        movw    $0xb800, %ax
+        movw    %ax, %fs
+1:
         movw    $0x0e00 + 'B', %fs:(0x12)
-        jmp     bogus_real_magic
+        jmp     1b
 
         .align 4
 real_magic:     .long 0x12345678
-- 
2.39.5