Re: [Qemu-devel] Disk I/O in QEMU

[Le Tan]

Hi Stefan,

Thanks for your help. I find that the source code of qemu-1.2.0 doesn't have hw/block/. So I download the qemu-1.6.2. However it doesn't work. I run the configure like this:

./configure --enable-kvm --x86_64-softmmu

then make and make install.

I can start the vm using this command:

qemu-system-x86_64 -m 1024 -smp 2 -hda my.img

But the qemu is not using the kvm to accelerate. Then I add the "-enable-kvm" in the command. I connect to the vm via VNC. However, the vnc-viewer is just black and displays nothing.

It used to work fine with qemu-1.2.0 (qemu-kvm). Of course, with qemu-kvm, there is no need to add the "-enable-kvm" option. 

So with qemu-1.6.2, did I miss any options? 

Thanks!

2014-03-11 20:23 GMT+08:00 Stefan Hajnoczi <address@hidden>:

On Tue, Mar 11, 2014 at 03:08:52PM +0800, Le Tan wrote:
> Hi, I am now studying the disk I/O in QEMU, but I know little about QEMU. I
> want to know how QEMU implements or emulates the disk I/O? Where to find
> some materials about this? And if I can get all the disk I/O request from
> the guest in QEMU? Thanks!

QEMU emulates hardware including IDE or SCSI controllers.  I/O requests
go through QEMU.  Look at hw/block/.

Stefan