On Mon, Nov 05, 2018 at 03:30:26PM +0000, Marc Zyngier wrote:
> We currently hide the LORegion feature, and generate an UNDEF
> if the guest dares using the corresponding registers. This is
> a bit extreme, as ARMv8.1 guarantees the feature to be present.
>
> The guest should check the feature register before doing anything,
> but we could also give the guest some slack (read "allow the
> guest to be a bit stupid").
>
> So instead of unconditionnaly deliver an exception, let's
> only do it when the host doesn't support LORegion at all (or
> when the feature has been sanitized out), and treat the registers
> as RAZ/WI otherwise (with the exception of LORID_EL1 being RO).
>
> Fixes: cc33c4e20185 ("arm64/kvm: Prohibit guest LOR accesses")
> Suggested-by: Richard Henderson <[email protected]>
> Signed-off-by: Marc Zyngier <[email protected]>
Acked-by: Christoffer Dall <[email protected]>
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