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Upgrade to 4.4.50-rt62
[kvmfornfv.git]
/
kernel
/
arch
/
x86
/
kernel
/
ioport.c
diff --git
a/kernel/arch/x86/kernel/ioport.c
b/kernel/arch/x86/kernel/ioport.c
index
37dae79
..
589b319
100644
(file)
--- a/
kernel/arch/x86/kernel/ioport.c
+++ b/
kernel/arch/x86/kernel/ioport.c
@@
-96,9
+96,14
@@
asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on)
SYSCALL_DEFINE1(iopl, unsigned int, level)
{
struct pt_regs *regs = current_pt_regs();
SYSCALL_DEFINE1(iopl, unsigned int, level)
{
struct pt_regs *regs = current_pt_regs();
- unsigned int old = (regs->flags >> 12) & 3;
struct thread_struct *t = ¤t->thread;
struct thread_struct *t = ¤t->thread;
+ /*
+ * Careful: the IOPL bits in regs->flags are undefined under Xen PV
+ * and changing them has no effect.
+ */
+ unsigned int old = t->iopl >> X86_EFLAGS_IOPL_BIT;
+
if (level > 3)
return -EINVAL;
/* Trying to gain more privileges? */
if (level > 3)
return -EINVAL;
/* Trying to gain more privileges? */
@@
-106,8
+111,9
@@
SYSCALL_DEFINE1(iopl, unsigned int, level)
if (!capable(CAP_SYS_RAWIO))
return -EPERM;
}
if (!capable(CAP_SYS_RAWIO))
return -EPERM;
}
- regs->flags = (regs->flags & ~X86_EFLAGS_IOPL) | (level << 12);
- t->iopl = level << 12;
+ regs->flags = (regs->flags & ~X86_EFLAGS_IOPL) |
+ (level << X86_EFLAGS_IOPL_BIT);
+ t->iopl = level << X86_EFLAGS_IOPL_BIT;
set_iopl_mask(t->iopl);
return 0;
set_iopl_mask(t->iopl);
return 0;