diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2019-11-11 23:03:29 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2019-11-16 11:24:05 +0100 |
| commit | a24ca9976843156eabbc5f2d798954b5674d1b61 (patch) | |
| tree | c1388bd5a00df2d9be5ca8efd602984a9dfbb6e8 /arch/x86/include/asm/processor.h | |
| parent | c8137ace56383688af911fea5934c71ad158135e (diff) | |
x86/iopl: Remove legacy IOPL option
The IOPL emulation via the I/O bitmap is sufficient. Remove the legacy
cruft dealing with the (e)flags based IOPL mechanism.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Juergen Gross <jgross@suse.com> (Paravirt and Xen parts)
Acked-by: Andy Lutomirski <luto@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/processor.h')
| -rw-r--r-- | arch/x86/include/asm/processor.h | 26 |
1 files changed, 3 insertions, 23 deletions
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index b0e02aa3f46a..1387d31c5e07 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -516,10 +516,10 @@ struct thread_struct { struct io_bitmap *io_bitmap; /* - * IOPL. Priviledge level dependent I/O permission which includes - * user space CLI/STI when granted. + * IOPL. Priviledge level dependent I/O permission which is + * emulated via the I/O bitmap to prevent user space from disabling + * interrupts. */ - unsigned long iopl; unsigned long iopl_emul; mm_segment_t addr_limit; @@ -552,25 +552,6 @@ static inline void arch_thread_struct_whitelist(unsigned long *offset, */ #define TS_COMPAT 0x0002 /* 32bit syscall active (64BIT)*/ -/* - * Set IOPL bits in EFLAGS from given mask - */ -static inline void native_set_iopl_mask(unsigned mask) -{ -#ifdef CONFIG_X86_32 - unsigned int reg; - - asm volatile ("pushfl;" - "popl %0;" - "andl %1, %0;" - "orl %2, %0;" - "pushl %0;" - "popfl" - : "=&r" (reg) - : "i" (~X86_EFLAGS_IOPL), "r" (mask)); -#endif -} - static inline void native_load_sp0(unsigned long sp0) { @@ -610,7 +591,6 @@ static inline void load_sp0(unsigned long sp0) native_load_sp0(sp0); } -#define set_iopl_mask native_set_iopl_mask #endif /* CONFIG_PARAVIRT_XXL */ /* Free all resources held by a thread. */ |