[PATCH] virhostcpu: fix getting CPU freq for Apple Silicon

The current implementation of virHostCPUGetInfo for macOS (__APPLE__) reads "hw.cpufrequency" from sysctl, which is available only on x86_64 architecture. On Apple Silicon ARM Macs, it's not available: $ sysctl hw.cpufrequency # No output $ arch -x86_64 sysctl hw.cpufrequency # Run with Rosetta 2 hw.cpufrequency: 2400000000 When running libvirtd on Apple Silicon, I got the error: cannot obtain CPU freq: No such file or directory. To fix it, we can calculate it with "hw.tbfrequency" and "kern.clockrate" instead: $ sysctl hw.tbfrequency hw.tbfrequency: 24000000 $ sysctl kern.clockrate kern.clockrate: { hz = 100, tick = 10000, tickadj = 0, profhz = 100, stathz = 100 } The result value would be hw.tbfrequency * kern.clockrate.hz. Signed-off-by: Menci <huanghaorui301(a)gmail.com&gt; --- src/util/virhostcpu.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/src/util/virhostcpu.c b/src/util/virhostcpu.c index a07c00a0e9..72983c91f3 100644 --- a/src/util/virhostcpu.c +++ b/src/util/virhostcpu.c @@ -927,9 +927,18 @@ virHostCPUGetInfo(virArch hostarch G_GNUC_UNUSED, *mhz = cpu_freq; # else + /* This works for Intel Macs */ if (sysctlbyname("hw.cpufrequency", &cpu_freq, &cpu_freq_len, NULL, 0) < 0) { - virReportSystemError(errno, "%s", _("cannot obtain CPU freq")); - return -1; + /* On Apple Silicon fallback to hw.tbfrequency and kern.clockrate.hz */ + struct clockinfo clockrate; + size_t clockrate_len = sizeof(clockrate); + if (sysctlbyname("hw.tbfrequency", &cpu_freq, &cpu_freq_len, NULL, 0) < 0 || + sysctlbyname("kern.clockrate", &clockrate, &clockrate_len, NULL, 0) < 0) { + virReportSystemError(errno, "%s", _("cannot obtain CPU freq")); + return -1; + } + + cpu_freq *= clockrate.hz; } *mhz = cpu_freq / 1000000; -- 2.34.1