Hi Christian, The kernelci.org bot recently has been reporting kvm guest boot failures[1] on various arm64 platforms in next-20151126. The bot bisected[2] the failures to the commit in -next titled "KVM: Create debugfs dir and stat files for each VM". I confirmed by reverting this commit on top of next-20151126 it resolves the boot issue. In this test case the host and guest are booted with the same kernel. The host is booted over nfs, installs qemu (qemu-system arm64 2.4.0), and launches a guest. The host is booting fine, but when the guest is launched it errors with "Failed to retrieve host CPU features!". I checked the host logs, and found an "Unable to handle kernel paging request" splat[3] which occurs when the guest is attempting to start. I scanned the patch in question but nothing obvious jumped out at me, any thoughts? Cheers, Tyler [1] http://kernelci.org/boot/all/job/next/kernel/next-20151126/ [2] http://hastebin.com/fuhicugate.vhdl [3]http://hastebin.com/yicefetuho.sm -- 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
