From a24ca9976843156eabbc5f2d798954b5674d1b61 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Mon, 11 Nov 2019 23:03:29 +0100 Subject: 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 Reviewed-by: Juergen Gross (Paravirt and Xen parts) Acked-by: Andy Lutomirski --- arch/x86/kernel/process_64.c | 11 ----------- 1 file changed, 11 deletions(-) (limited to 'arch/x86/kernel/process_64.c') 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 -- cgit v1.2.3