From: Joerg Roedel <jroe...@suse.de>
Exception handling in the startup_32 boot path requires the CS
selector to be correctly set up. Reload it from the current GDT.
Signed-off-by: Joerg Roedel <jroe...@suse.de>
---
arch/x86/boot/compressed/head_64.S | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/arch/x86/boot/compressed/head_64.S
b/arch/x86/boot/compressed/head_64.S
index e94874f4bbc1..c59c80ca546d 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -107,9 +107,16 @@ SYM_FUNC_START(startup_32)
movl %eax, %gs
movl %eax, %ss
-/* setup a stack and make sure cpu supports long mode. */
+ /* Setup a stack and load CS from current GDT */
leal rva(boot_stack_end)(%ebp), %esp
+ pushl $__KERNEL32_CS
+ leal rva(1f)(%ebp), %eax
+ pushl %eax
+ lretl
+1:
+
+ /* Make sure cpu supports long mode. */
call verify_cpu
testl %eax, %eax
jnz .Lno_longmode
--
2.30.1
_______________________________________________
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
