Re: [libvirt] [PATCH v2 7/7] qemu: Check TSC frequency before starting QEMU

When migrating a domain with invtsc CPU feature enabled, the TSC frequency of the destination host must match the frequency used when the domain was started on the source host or the destination host has to support TSC scaling. If the frequencies do not match and the destination host does not support TSC scaling, QEMU will fail to set the right TSC frequency when starting vCPUs on the destination and thus migration will fail. However, this is quite late since both host might have spent significant time transferring memory and perhaps even storage data. By adding the check to libvirt we can let migration fail before any data starts to be sent over. If for some reason libvirt is unable to detect the host's TSC frequency or scaling support, we'll just let QEMU try and the migration will either succeed or fail later. Luckily, we mandate TSC frequency to be explicitly set in the domain XML to even allow migration of domains with invtsc. We can just check whether the requested frequency is compatible with the current host before starting QEMU. https://bugzilla.redhat.com/show_bug.cgi?id=1641702 Signed-off-by: Jiri Denemark <jdenemar(a)redhat.com&gt; --- src/qemu/qemu_process.c | 53 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+)