MSR_KVM_STEAL_TIME: 0x4b564d03

  data: 64-byte alignment physical address of a memory area which must be
  in guest RAM, plus an enable bit in bit 0. This memory is expected to
  hold a copy of the following structure:

  struct kvm_steal_time {
    __u64 steal;
    __u32 version;
    __u32 flags;
    __u8  preempted;
    __u8  u8_pad[3];
    __u32 pad[11];
  }

  whose data will be filled in by the hypervisor periodically. Only one
  write, or registration, is needed for each VCPU. The interval between
  updates of this structure is arbitrary and implementation-dependent.
  The hypervisor may update this structure at any time it sees fit until
  anything with bit0 == 0 is written to it. Guest is required to make sure
  this structure is initialized to zero.

  Fields have the following meanings:

    version: a sequence counter. In other words, guest has to check
    this field before and after grabbing time information and make
    sure they are both equal and even. An odd version indicates an
    in-progress update.

    flags: At this point, always zero. May be used to indicate
    changes in this structure in the future.

    steal: the amount of time in which this vCPU did not run, in
    nanoseconds. Time during which the vcpu is idle, will not be
    reported as steal time.

    preempted: indicate the vCPU who owns this struct is running or
    not. Non-zero values mean the vCPU has been preempted. Zero
    means the vCPU is not preempted. NOTE, it is always zero if the
    the hypervisor doesn't support this field.