On Thu, Nov 17, 2016 at 05:45:41PM +0100, Andrew Jones wrote: > Hi Mark, > > On Wed, Nov 16, 2016 at 05:45:44PM +0000, Mark Rutland wrote: > > So I don't think we should try to distinguish ARMv8-A AArch32 from > > ARMv7-A. We should test individual features, or if that's not possible, > > group them in the same bucket. > > Perhaps I was too quick to look for a general way to approach the first > place I saw the need, which is > > check_cntr(read_pmccntr()); > if (is_aarch64()) > check_cntr(read_pmccntr64()); > > Is PMCCNTR the only "weird" difference? Define "weird". ;) I believe the extension of PMCCNTR to 64 bits is part of PMUv3. So you should be able to check ID_DFR0.PerfMon == 0b0011. For overflow you'll also need to configure PMCR.LC. Thanks, Mark. -- 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
