On Tue, Sep 25, 2012 at 1:04 PM, Will Deacon <will.deacon@xxxxxxx> wrote: > On Sat, Sep 15, 2012 at 04:36:05PM +0100, Christoffer Dall wrote: >> From: Christoffer Dall <cdall@xxxxxxxxxxxxxxx> >> >> When the guest executes a WFI instruction the operation is trapped to >> KVM, which emulates the instruction in software. There is no correlation >> between a guest executing a WFI instruction and actually putting the >> hardware into a low-power mode, since a KVM guest is essentially a >> process and the WFI instruction can be seen as 'sleep' call from this >> process. Therefore, we block the vcpu when the guest excecutes a wfi >> instruction and the IRQ or FIQ lines are not raised. >> >> When an interrupt comes in through KVM_IRQ_LINE (see previous patch) we >> signal the VCPU thread and unflag the VCPU to no longer wait for >> interrupts. > > Seems a bit strange tagging this small addition on the end of this series. > Can you merge it in with the rest? > sure, I'll tag it in with the world-switch or emulation. -Christoffer -- 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
