On Tue, Sep 06, 2016 at 09:28:45AM +0100, Marc Zyngier wrote: > In order to efficiently perform the GICV access on behalf of the > guest, we need to be able to avoid going back all the way to > the host kernel. > > For this, we introduce a new hook in the world switch code, > conveniently placed just after populating the fault info. > At that point, we only have saved/restored the GP registers, > and we can quickly perform all the required checks (data abort, > translation fault, valid faulting syndrome, not an external > abort, not a PTW). > > Coming back from the emulation code, we need to skip the emulated > instruction. This involves an additional bit of save/restore in > order to be able to access the guest's PC (and possibly CPSR if > this is a 32bit guest). > > At this stage, no emulation code is provided. > > Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx> Reviewed-by: Christoffer Dall <christoffer.dall@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
