QEMU Source Code Study (2) - KVM_init

At first, main() in vl.c will call configure_accelerator()

QEMU Part

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configure_accelerator()

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accel_list[]

kvm_init()

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KVMState

kvm_ioctl(KVMState *s, int type, ...)

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KVM Part

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Register ioctl handler

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vmx_init() -> kvm_init(...) -> misc_register(kvm_dev) -> kvm.&kvm_chardev_ops

kvm_dev

kvm_chardev_ops

KVM API

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The "/dev/kvm" ioctl handler is as follows:

KVM_GET_API_VERSION

This API just return the API version of KVM. The handler just return he version of KVM. This parameter is defined in ./include/uapi/linux/kvm.h

KVM_CREATE_VM

This API is used by QEMU to ask KVM create VM. "KVM_CREATE_VM" definition is the same as KVM_GET_API_VERSION.