Comment 3 for bug 2041678

As can be seen here (https://launchpad.net/~mwhudson/+archive/ubuntu/devirt/+build/22621733), elf/tst-cpu-features-cpuinfo fails on the current (fairly new) launchpad builders. The failure is:

Checking HAS_CPU_FEATURE (WBNOINVD):
  HAS_CPU_FEATURE (WBNOINVD): 1
  cpuinfo (wbnoinvd): 0
 *** failure ***

/proc/cpuinfo is:

processor : 0
vendor_id : AuthenticAMD
cpu family : 23
model : 49
model name : AMD EPYC-Rome Processor
stepping : 0
microcode : 0x1000065
cpu MHz : 2499.998
cache size : 512 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm rep_good nopl xtopology cpuid extd_apicid tsc_known_freq pni pclmulqdq ssse3 fma cx16 sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm svm cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw topoext perfctr_core ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 xsaves clzero xsaveerptr arat npt nrip_save umip rdpid
bugs : sysret_ss_attrs spectre_v1 spectre_v2 spec_store_bypass
bogomips : 4999.99
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: