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1. when hot plug vcpu, KVM will call kvm_write_tsc set the new vcpu's
tsc_offset to host tsc. The new vcpu's tsc_offsets is greatly different
from preallocated vcpu's tsc_offset.
2. For redhat 6.x, the vm will show warning and turn off TSC clock.
kernel: CPU 1 got hotplugged
kernel: kvm-clock: cpu 1, msr 0:282367c1, secondary cpu clock
kernel: TSC synchronization [CPU#0 -> CPU#1]:
kernel: Measured 150076598781 cycles TSC warp between CPUs, turning off TSC
clock.
kernel: Marking TSC unstable due to check_tsc_sync_source failed
3. I think should set the new vcpu's tsc_offset to
kvm->arch.cur_tsc_offset.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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Ubuntu 15.10: tsc_offset is error for hot-plugged vcpu.
https://bugs.launchpad.net/bugs/1567167
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