KVM_CREATE_VCPU max vcpu ABI

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Hi!

Documentation/kvm/api.txt says the following:

  4.6 KVM_CREATE_VCPU

  Capability: basic
  Architectures: all
  Type: vm ioctl
  Parameters: vcpu id (apic id on x86)
  Returns: vcpu fd on success, -1 on error

  This API adds a vcpu to a virtual machine.  The vcpu id is a small integer
  in the range [0, max_vcpus).

However, max_vcpus is not specified and I am unable to find ioctl()
which I could use to look it up. Is it specified somewhere? We can, of
course, attempt to create as many VCPUs as possible until
KVM_CREATE_VCPU returns EINVAL...

                        Pekka
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