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

From: Le Tan
Subject: Re: [Qemu-devel] Disk I/O in QEMU
Date: Wed, 12 Mar 2014 20:27:39 +0800

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? 

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/.


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