tree e0d7c7abe9d36450abcb020858d7e25636718faf
parent 13cbc0cd4a30c815984ad88e3a2e5976493516a3
author Andy Lutomirski <luto@kernel.org> 1593795777 -0700
committer Thomas Gleixner <tglx@linutronix.de> 1593884846 +0200

x86/ldt: Disable 16-bit segments on Xen PV

Xen PV doesn't implement ESPFIX64, so they don't work right.  Disable
them.  Also print a warning the first time anyone tries to use a
16-bit segment on a Xen PV guest that would otherwise allow it
to help people diagnose this change in behavior.

This gets us closer to having all x86 selftests pass on Xen PV.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/92b2975459dfe5929ecf34c3896ad920bd9e3f2d.1593795633.git.luto@kernel.org