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| 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/kernel/process_64.c | |
| parent | x86/iopl: Restrict iopl() permission scope (diff) | |
| download | linux-a24ca9976843156eabbc5f2d798954b5674d1b61.tar.xz linux-a24ca9976843156eabbc5f2d798954b5674d1b61.zip | |
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/kernel/process_64.c')
| -rw-r--r-- | arch/x86/kernel/process_64.c | 11 |
1 files changed, 0 insertions, 11 deletions
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index e93a1b8fd7f9..506d66830d4d 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -497,17 +497,6 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p) switch_to_extra(prev_p, next_p); -#ifdef CONFIG_XEN_PV - /* - * On Xen PV, IOPL bits in pt_regs->flags have no effect, and - * current_pt_regs()->flags may not match the current task's - * intended IOPL. We need to switch it manually. - */ - if (unlikely(static_cpu_has(X86_FEATURE_XENPV) && - prev->iopl != next->iopl)) - xen_set_iopl_mask(next->iopl); -#endif - if (static_cpu_has_bug(X86_BUG_SYSRET_SS_ATTRS)) { /* * AMD CPUs have a misfeature: SYSRET sets the SS selector but |