On Fri, May 17, 2019 at 2:15 PM Eduardo Habkost <ehabk...@redhat.com> wrote: > Are you running the same kernel version on all VMs? > X86_FEATURE_CPUID was added in Linux v4.11. >
Eduardo, I am running a 4.9.162 virtual machine (very intentionally, the drivers I need got broken in 4.11) inside of a 5.1.2 host. X86_FEATURE_CPUID is certainly defined in arch/x86/kernel/cpu/capflags.c but nothing much seems to be done with it. The whole reason this came up is I was running 'perf top' on the virtual host and it was spending the most kernel time calling cpuid(), which seemed wrong. - Matthew
