Hi, I am now diving into the disk I/O in kvm. But I find that things are a little messy about this and I am stuck here. I configure the virtual machine with a virtual IDE disk and DMA support. I need to get every disk I/O issued by the virtual machine. I know that there are struct IDEDevie, struct IDEBus, struct IDEDMA etc. in the qemu. But I just can't figure out the logical relationships among these things and the general code path of the disk I/O or DMA. So, how is IDE disk or DMA emulated in qemu-kvm? What is the gerneral path or logic when the vcpu issues a disk I/O? Can anyone give me the complete gerneral description or idea of the disk I/O in qemu-kvm? Or which part of the code should be taken in consideration? Maybe there are some useful materials? Maybe the question is a little complicated. Any help is appreciated! Thanks!
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