On Mon, Jul 08, 2013 at 11:15:12PM -0500, Yaodong Yang wrote: > I have a question about the qemu block-subsytem. When a user in guest os > perform an io operation, how this io request performed in the qemu. Where > is the start point in qemu code to serve this request.
QEMU emulates a number of different storage controllers, including virtio-blk, virtio-scsi, IDE, USB Mass Storage Device, SD cards, etc. See hw/block/ for storage controller emulation code, which the guest drivers invoke through hardware register accesses. Stefan
