Messages in this thread Patch in this message | | | From | "H. Peter Anvin" <> | Subject | [PATCH v3 5/8] x86/desc: add native_[ig]dt_invalidate() to <asm/desc.h> | Date | Wed, 19 May 2021 14:21:51 -0700 |
| |
From: "H. Peter Anvin (Intel)" <hpa@zytor.com>
In some places, we want the native forms of descriptor table invalidation. Rather than open-coding them, add explicitly native functions to invalidate the GDT and IDT.
Signed-off-by: H. Peter Anvin (Intel) <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 -- 2.31.1
| |