memory test in ubuntu_kvm_unit tests fails linux-kvm (clflushopt absent)

[Sean Feole]

Series: Xenial
Kernel: 4.4.0-1059.66 linux-kvm

specifically clfushopt and clwb

09/23 08:43:08 DEBUG| utils:0116| Running 'kvm-ok'
09/23 08:43:08 DEBUG| utils:0153| [stdout] INFO: /dev/kvm exists
09/23 08:43:08 DEBUG| utils:0153| [stdout] KVM acceleration can be used
09/23 08:43:08 DEBUG| utils:0116| Running '/home/ubuntu/autotest/client/tmp/ubuntu_kvm_unit_tests/src/kvm-unit-tests/tests/memory'
09/23 08:43:08 DEBUG| utils:0153| [stdout] BUILD_HEAD=e2c275c4
09/23 08:43:09 DEBUG| utils:0153| [stdout] timeout -k 1s --foreground 90s /usr/bin/qemu-system-x86_64 -nodefaults -device pc-testdev -device isa-debug-exit,iobase=0xf4,iosize=0x4 -vnc none -serial stdio -device pci-testdev -machine accel=kvm -kernel /tmp/tmp.HnxXwZrpQ9 -smp 1 -cpu host # -initrd /tmp/tmp.SL7FtNHKpq
09/23 08:43:09 DEBUG| utils:0153| [stdout] enabling apic
09/23 08:43:09 DEBUG| utils:0153| [stdout] PASS: clflush (present)
09/23 08:43:09 DEBUG| utils:0153| [stdout] PASS: sfence (present)
09/23 08:43:09 DEBUG| utils:0153| [stdout] PASS: lfence (present)
09/23 08:43:09 DEBUG| utils:0153| [stdout] PASS: mfence (present)
09/23 08:43:09 DEBUG| utils:0153| [stdout] FAIL: clflushopt (ABSENT)
09/23 08:43:09 DEBUG| utils:0153| [stdout] FAIL: clwb (ABSENT)
09/23 08:43:09 DEBUG| utils:0153| [stdout] PASS: invalid clwb
09/23 08:43:09 DEBUG| utils:0153| [stdout] PASS: pcommit (ABSENT)
09/23 08:43:09 DEBUG| utils:0153| [stdout] SUMMARY: 8 tests, 2 unexpected failures
09/23 08:43:09 DEBUG| utils:0153| [stdout] FAIL memory (8 tests, 2 unexpected failures)

[Po-Hsu Lin (cypressyew)]

Can be found on B-azure, instance Standard_F32s_v2

[Sean Feole (sfeole)]

the same to failures occur in Eoan 5.3.0-1011.12 linux-kvm

[Brian Murray (brian-murray)]

The Eoan Ermine has reached end of life, so this bug will not be fixed for that release

[Guilherme G. Piccoli (gpiccoli)]

Found on Bionic/linux-kvm, cycle sru-20210412.

This seems to be really HW dependent, if the processor is not so modern to contain such special instructions, it's going to fail.

[Kleber Sacilotto de Souza (kleber-souza)]

Found with trusty/linux-azure 4.15.0-1114.127~14.04.1.

[Guilherme G. Piccoli (gpiccoli)]

Issue observed in B/KVM, cycle sru-20210510.

[Po-Hsu Lin (cypressyew)]

We don't have X-kvm anymore, for B-kvm, it's failing with clflushopt / clwb ABSENT (bug 1831449)