KVM: selftests: Restore assert for non-nested VMs in access tracking test

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Restore the assert (on x86-64) that <10% of pages are still idle when NOT
running as a nested VM in the access tracking test.  The original assert
was converted to a "warning" to avoid false failures when running the
test in a VM, but the non-nested case does not suffer from the same
"infinite TLB size" issue.

Using the HYPERVISOR flag isn't infallible as VMMs aren't strictly
required to enumerate the "feature" in CPUID, but practically speaking
anyone that is running KVM selftests in VMs is going to be using a VMM
and hypervisor that sets the HYPERVISOR flag.

Cc: David Matlack <dmatlack@google.com>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20221129175300.4052283-3-seanjc@google.com

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This commit is contained in:

Sean Christopherson 2022-11-29 17:53:00 +00:00

parent a33004e844

commit 8fcee04213

2 changed files with 13 additions and 5 deletions

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17

tools/testing/selftests/kvm/access_tracking_perf_test.c

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1

tools/testing/selftests/kvm/include/x86_64/processor.h

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