Ubuntu
linux-kvm package

  1. Bug #1831449
  2. Comment #18

Comment 18 for bug 1831449

Revision history for this message
Po-Hsu Lin (cypressyew) wrote :

When comparing the Focal 5.4 generic AMD64 kernel test output and Focal 5.4 KVM AMD64 kernel test output, you can see the generic kernel will pass with:

 PASS: clflush (present)
 PASS: sfence (present)
 PASS: lfence (present)
 PASS: mfence (present)
 PASS: clflushopt (ABSENT)
 PASS: clwb (ABSENT)
 PASS: invalid clwb
 PASS: pcommit (ABSENT)
 SUMMARY: 8 tests
 PASS memory (8 tests)

Instead the KVM kernel will fail with:
 FAIL: clflushopt (ABSENT)
 FAIL: clwb (ABSENT)

I wonder what's the difference here.