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?



[1] http://kernelci.org/boot/all/job/next/kernel/next-20151126/
[2] http://hastebin.com/fuhicugate.vhdl
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