[PATCH v2 01/15] KVM: arm/arm64: VGIC: don't track used LRs in the distributor

Pavel Fedin p.fedin at samsung.com
Fri Oct 2 03:39:26 PDT 2015


> For instance how did you come up with that 16384? LPIs could actually be
> much bigger (in fact the emulation currently support up to 64k).

 Well, read "at least 16384". I actually don't remember the exact value you've put in.

> >  Since the map itself is actually used only for piggy-back optimization, it is possible to
> easily
> > get rid of it using for_each_set_bit(lr, vgic_cpu->lr_used, vgic->nr_lr) iteration instead.
> Can't you use the ELRSR bitmap instead? The idea of lr_used sounds like
> a moot optimization to me.

 I'll take a look. You seem to be right, lr_used became a direct (well, inverted) copy of elrsr
after full elrsr synchronization was introduced long time ago. It's just current code relying on
lr_used everywhere.

Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia

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