Re: [Xen-devel] Logging Access to HDD

[Sebastian Biedermann <biedermann@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>]

Am 19.04.2011 11:35, schrieb James Harper:
> > Dear List,
> >
> > I´m working in research and I tought this list could be
> > a good adress for my questions.
> >
> > I want to log the disk accesses of the virtual hvm instances running in Xen.
> > That means for the start I want to log the write querys of a running
> > domU instance in the dom0 instance.
> >
> > So I´m trying to modify the Xen 3.2.1 source code,
> > but actually I was not able to find a good entry point to do this.
> >
> > For now, I want to log the disk accesses of a running windows 7 domU
> > instance.
> > The best what could happenis that I could see even the source and target
> > of a hdd write query.
> >
> > Does anyone have an idea how I could do this on a good way?
> > Which Xen source file / function should I modify? Where is the best
> > entry point to do this?
> HVM access can either be emulated PCI IDE, or PV. For the emulated access you 
> would hook into qemu, I think. For PV access you would need to hook into 
> whatever block device backend you are using.
>
> Do you just want to count reads and writes, or do you want to log every single 
> byte read/written?
>
> James
I dont need to log every single byte, it would be enough to know which 
file is accessed by the domU inside its image.
So when I use HVM I need to modify qemu and not the xen source?

thanks

--
Sebastian


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