The kernel refuses to set guest TSC frequency less than a minimum frequency or greater than maximum frequency (both computed based on the host TSC frequency). When writing the libvirt code with a reversed logic (return success when the requested frequency falls within the tolerance interval) I forgot to include the boundaries. Fixes: d8e5b4560006590668d4669f54a46b08ec14c1a2 https://bugzilla.redhat.com/show_bug.cgi?id=1839095 Signed-off-by: Jiri Denemark <jdenemar(a)redhat.com&gt; --- src/qemu/qemu_process.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c index e7421b415f..e9802809a5 100644 --- a/src/qemu/qemu_process.c +++ b/src/qemu/qemu_process.c @@ -5403,7 +5403,7 @@ qemuProcessStartValidateTSC(virQEMUDriverPtr driver, tsc->frequency, virTristateBoolTypeToString(tsc->scaling), tolerance); - if (freq > minFreq && freq < maxFreq) { + if (freq >= minFreq && freq <= maxFreq) { VIR_DEBUG("Requested TSC frequency is within tolerance interval"); return 0; } -- 2.30.0