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

Message ID 20200211135256.24617-27-joro@8bytes.org (mailing list archive)
State New, archived
Headers show
Series Linux as SEV-ES Guest Support | expand

Commit Message

Joerg Roedel Feb. 11, 2020, 1:52 p.m. UTC 
From: Joerg Roedel <jroedel@suse.de>

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@suse.de>
---
 arch/x86/kernel/head_64.S | 5 +++++
 1 file changed, 5 insertions(+)
diff mbox series

Patch

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