Paravirtualized block device

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Host side

run kvm with command-line: -drive file=<path_to_your_raw_qemu_img>,if=virtio

you can also specify boot=on in the command-line: -drive file=<path_to_your_raw_qemu_img>,if=virtio,boot=on

Guest side

sudo modprobe virtio_blk

to have virtio_blk driver, you need to upgrade the kernel to higher than 2.6.25.

refer to Virtio

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