Re: [PATCH v4 01/46] KVM: PPC: Book3S HV: Nested move LPCR sanitising to sanitise_hv_regs

On Tue, Mar 23, 2021 at 11:02:20AM +1000, Nicholas Piggin wrote:

This will get a bit more complicated in future patches. Move it
into the helper function.

This does change L1-visible behaviour, because now the L1 hypervisor
can see the LPCR bits that L0 is using, whereas previously it couldn't
(and that was deliberate).  I can't point to a specific scenario where
that is a real problem, but nevertheless it worries me.  And the
behaviour change should have been mentioned in the commit message at
least.

Paul.