From 283fa3b6483a84aeb62f1b97c2ec7c02eb2f5882 Mon Sep 17 00:00:00 2001 From: "H. Peter Anvin (Intel)" Date: Wed, 19 May 2021 14:21:51 -0700 Subject: x86: Add native_[ig]dt_invalidate() In some places, the native forms of descriptor table invalidation is required. Rather than open-coding them, add explicitly native functions to invalidate the GDT and IDT. Signed-off-by: H. Peter Anvin (Intel) Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/r/20210519212154.511983-6-hpa@zytor.com --- arch/x86/include/asm/desc.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/x86/include/asm/desc.h b/arch/x86/include/asm/desc.h index b8429ae50b71..400c17862870 100644 --- a/arch/x86/include/asm/desc.h +++ b/arch/x86/include/asm/desc.h @@ -224,6 +224,26 @@ static inline void store_idt(struct desc_ptr *dtr) asm volatile("sidt %0":"=m" (*dtr)); } +static inline void native_gdt_invalidate(void) +{ + const struct desc_ptr invalid_gdt = { + .address = 0, + .size = 0 + }; + + native_load_gdt(&invalid_gdt); +} + +static inline void native_idt_invalidate(void) +{ + const struct desc_ptr invalid_idt = { + .address = 0, + .size = 0 + }; + + native_load_idt(&invalid_idt); +} + /* * The LTR instruction marks the TSS GDT entry as busy. On 64-bit, the GDT is * a read-only remapping. To prevent a page fault, the GDT is switched to the -- cgit v1.2.3-59-g8ed1b