22 Jul
2020
22 Jul
'20
4:21 p.m.
On Fri, Jul 17, 2020 at 12:21 AM ira.weiny@intel.com wrote:
From: Ira Weiny ira.weiny@intel.com
The PKRS MSR is not managed by XSAVE. It is already preserved through a context switch but this support leaves exception handling code open to memory accesses which the interrupted process has allowed.
Close this hole by preserve the current task's PKRS MSR, reset the PKRS MSR value on exception entry, and then restore the state on exception exit.
Should this live in pt_regs?
--Andy