| From | Andy Lutomirski <> | Date | Wed, 22 Jul 2020 09:21:43 -0700 | Subject | Re: [PATCH RFC V2 17/17] x86/entry: Preserve PKRS MSR across exceptions |
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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
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