qemu workaround

cedee51b · Silas Boyd-Wickizer · 3f0fefbe · cedee51b
--- a/include/pmc.hh
+++ b/include/pmc.hh
@@ -10,7 +10,12 @@ struct pmc_count {
    // XXX(sbw) we loose our original affinity
    for (int i = 0; i < NCPU; i++) {
      setaffinity(i);
+      // XXX(sbw) qemu doesn't seem to support CR4_PCE
+#if defined(HW_qemu)
+      n.count_[i] = 0;
+#else
      n.count_[i] = rdpmc(ctr);
+#endif
    }
    setaffinity(-1);
    return n;