diff options
| -rw-r--r-- | target/ppc/kvm.c | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c index 298c1f882c..104a308abb 100644 --- a/target/ppc/kvm.c +++ b/target/ppc/kvm.c @@ -1815,24 +1815,37 @@ static int read_cpuinfo(const char *field, char *value, int len) return ret; } -uint32_t kvmppc_get_tbfreq(void) +static uint32_t kvmppc_get_tbfreq_procfs(void) { char line[512]; char *ns; - uint32_t retval = NANOSECONDS_PER_SECOND; + uint32_t tbfreq_fallback = NANOSECONDS_PER_SECOND; + uint32_t tbfreq_procfs; if (read_cpuinfo("timebase", line, sizeof(line))) { - return retval; + return tbfreq_fallback; } ns = strchr(line, ':'); if (!ns) { - return retval; + return tbfreq_fallback; } - ns++; + tbfreq_procfs = atoi(++ns); + + /* 0 is certainly not acceptable by the guest, return fallback value */ + return tbfreq_procfs ? tbfreq_procfs : tbfreq_fallback; +} + +uint32_t kvmppc_get_tbfreq(void) +{ + static uint32_t cached_tbfreq; + + if (!cached_tbfreq) { + cached_tbfreq = kvmppc_get_tbfreq_procfs(); + } - return atoi(ns); + return cached_tbfreq; } bool kvmppc_get_host_serial(char **value) |