KVM: selftests: Create a demand paging test
While userfaultfd, KVM's demand paging implementation, is not specific to KVM, having a benchmark for its performance will be useful for guiding performance improvements to KVM. As a first step towards creating a userfaultfd demand paging test, create a simple memory access test, based on dirty_log_test. Reviewed-by: NOliver Upton <oupton@google.com> Signed-off-by: NBen Gardon <bgardon@google.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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