On 22/12/15 08:07, Shannon Zhao wrote: > From: Shannon Zhao <shannon.zhao@xxxxxxxxxx> > > This patchset adds guest PMU support for KVM on ARM64. It takes > trap-and-emulate approach. When guest wants to monitor one event, it > will be trapped by KVM and KVM will call perf_event API to create a perf > event and call relevant perf_event APIs to get the count value of event. > > Use perf to test this patchset in guest. When using "perf list", it > shows the list of the hardware events and hardware cache events perf > supports. Then use "perf stat -e EVENT" to monitor some event. For > example, use "perf stat -e cycles" to count cpu cycles and > "perf stat -e cache-misses" to count cache misses. I finally feel like we're pretty close to something we could merge. My current concerns are: - the 32bit bugs, and the fact that it has obviously not been tested with a 32bit guest. It would be good to give it a go (you'll probably have to lie about the nature of the PMU in your QEMU code by pretending it is a Cortex-A15 PMU, for example). - The UNDEF path and the patch I've posted today. I've quickly tested it, and it seems to do the right thing, but this warrant a thorough review. - I'd like Peter Maydell (cc'd) to give his Ack to the last patch, as we need the userspace ABI to be agreed upon. Thanks, M. -- Jazz is not dead. It just smells funny... -- 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
