OK, looks like we need at least:
commit 56402d63eefe22179f7311a51ff2094731420406
Author: Thomas Gleixner <[email protected]>
Date: Fri May 6 20:48:16 2016 +0200
x86/topology: Handle CPUID bogosity gracefully
Joseph reported that a XEN guest dies with a division by 0 in the package
topology setup code. This happens if cpu_info.x86_max_cores is zero.
That at least will avoid the crash. But the change only sets ncpus to 1
if it is 0. That still might lead to an unexpected number of available
CPUs...
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https://bugs.launchpad.net/bugs/1582776
Title:
HVM/SSD Xenial AWS AMI doesn't launch on r3.large
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