| From | Joerg Roedel <> | Subject | [PATCH 26/62] x86/head/64: Reload GDT after switch to virtual addresses | Date | Tue, 11 Feb 2020 14:52:20 +0100 |
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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 --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
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