Messages in this thread Patch in this message | | | From | "H. Peter Anvin" <> | Subject | [PATCH v2 5/9] x86/desc: add native_[ig]dt_invalidate() to <asm/desc.h> | Date | Fri, 14 May 2021 18:43:57 -0700 |
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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 | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/arch/x86/include/asm/desc.h b/arch/x86/include/asm/desc.h index b8429ae50b71..aa366b2bbc41 100644 --- a/arch/x86/include/asm/desc.h +++ b/arch/x86/include/asm/desc.h @@ -224,6 +224,21 @@ static inline void store_idt(struct desc_ptr *dtr) asm volatile("sidt %0":"=m" (*dtr)); } +static const struct desc_ptr __invalid_gdt_idt_ptr __maybe_unused = { + .address = 0, + .size = 0 +}; + +static inline void native_gdt_invalidate(void) +{ + native_load_gdt(&__invalid_gdt_idt_ptr); +} + +static inline void native_idt_invalidate(void) +{ + native_load_idt(&__invalid_gdt_idt_ptr); +} + /* * 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
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