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perf_test_util is used to set up KVM selftests where vCPUs touch a region of memory. The guest code is implemented in perf_test_util.c (not the calling selftests). The guest code requires a 1 parameter, the vcpuid, which has to be set by calling vcpu_args_set(vm, vcpu_id, 1, vcpu_id). Today all of the selftests that use perf_test_util are making this call. Instead, perf_test_util should just do it. This will save some code but more importantly prevents mistakes since totally non-obvious that this needs to be called and failing to do so results in vCPUs not accessing the right regions of memory. Signed-off-by: David Matlack <dmatlack@google.com> Message-Id: <20210805172821.2622793-1-dmatlack@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>