Hi Paolo & Juan, I found some of the kvm_vcpu_ioctl operation takes about more than 10ms with the 3.10.0-229.el7.x86_64 kernel, which prolong the VM service downtime when doing live migration about 20~30ms. This happened when doing the KVM_KVMCLOCK_CTRL ioctl. It's worse if more VCPUs used by guest(4VPUs in my test). The upstream kernel does not have this issue because of the patch 7a72f7a140bfd3, maybe this patch should be backported to the el7 kernel.
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