[PATCH 26/62] x86/head/64: Reload GDT after switch to virtual addresses

[Joerg Roedel]

From: Joerg Roedel <jroedel@xxxxxxx>

Reload the GDT after switching to virtual addresses to make sure it will
not go away when the lower mappings are removed.

Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
---
 arch/x86/kernel/head_64.S | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 5a3cde971cb7..a3a9383e8dd6 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -157,6 +157,11 @@ SYM_CODE_START(secondary_startup_64)
 1:
 	UNWIND_HINT_EMPTY
 
+	/* Setup boot GDT descriptor and load boot GDT */
+	leaq	boot_gdt(%rip), %rax
+	movq	%rax, boot_gdt_base(%rip)
+	lgdt	boot_gdt_descr(%rip)
+
 	/* Check if nx is implemented */
 	movl	$0x80000001, %eax
 	cpuid
-- 
2.17.1