[xen staging] x86/boot: Setup correctly fs segment for bogus_real_magic

[patchbot@xxxxxxx]

commit 7d5781d526fb56f4858e9d9ac38e8867ab178a68
Author:     Frediano Ziglio <frediano.ziglio@xxxxxxxxx>
AuthorDate: Mon Nov 11 13:28:23 2024 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Mon Nov 11 15:25:39 2024 +0000

    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@xxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 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
--
generated by git-patchbot for /home/xen/git/xen.git#staging