[PATCH 6/6] KVM: PPC: Book3S HV Nested: L2 LPCR should inherit L1 LPES setting

[Fabiano Rosas]

Nicholas Piggin <npiggin at gmail.com> writes:

> The L1 should not be able to adjust LPES mode for the L2. Setting LPES
> if the L0 needs it clear would cause external interrupts to be sent to
> L2 and missed by the L0.
>
> Clearing LPES when it may be set, as typically happens with XIVE enabled
> could cause a performance issue despite having no native XIVE support in
> the guest, because it will cause mediated interrupts for the L2 to be
> taken in HV mode, which then have to be injected.
>
> Signed-off-by: Nicholas Piggin <npiggin at gmail.com>

Reviewed-by: Fabiano Rosas <farosas at linux.ibm.com>