Re: [PATCH entry v2 5/6] x86/ldt: Disable 16-bit segments on Xen PV

2020-07-03 Thread Andrew Cooper
On 03/07/2020 18:02, Andy Lutomirski wrote: > 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.

[PATCH entry v2 5/6] x86/ldt: Disable 16-bit segments on Xen PV

2020-07-03 Thread Andy Lutomirski
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