Export kernel address to user space by mmap in kvm

From Document/kvm/api.txt Application code obtains a pointer to the kvm_run structure by mmap()ing a vcpu fd. From that point, application code can control execution by changing fields in kvm_run prior to calling the KVM_RUN ioctl, and obtain information about the reason KVM_RUN returned by looking up structure members. I just want to point out that: [...]

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