[PATCH 30/70] x86/head/64: Reload GDT after switch to virtual addresses
From: Joerg Roedel <joro@8bytes.org>
Date: 2020-03-19 09:18:29
Also in:
kvm, lkml
Subsystem:
the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
From: Joerg Roedel <redacted> 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 <redacted> --- 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 5219a70b3fb4..ebb7d512c9d3 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S@@ -163,6 +163,11 @@ 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