On Tue, Feb 01, 2011 at 03:41:02AM +0800, holmes wrote:
> Hi all,
> I am new to Xen. I want to debug xen. So I have few questions here. If
> anybody can help me, I'd appreciate it.
> 1: My system is ubuntu 8.04. I download the xen-3.4.2 source code from xen
> website. After I "make world", it will download the linux-2.6.18-xen.hg
> (kernel?). Also it will make many other folders (./dist). I found
> blkfront.c in both ./linux-2.6.18-xen.hg/drivers/xen/blkfront folder and
> ./dist/install/lib/modules/2.6.18.8-xen/source/drivers/xen/blkfront/
> folder. So, what's the difference of the two folders and what are they
> doing?
dist/ is the directory where stuff lands after successful build,
ie. you can copy from dist/ to / to install xen.
> 2: if I want to log the activities (read/write block) information in
> domU(winxp), how do I log it? For example, if domU read a block, I
> therefore print a information into a log file (like "domU read"). Should I
> change something in blkfront.c file? If so, which one should I change,
> because there are two blkfront.c.
> 3: if I want to log the information, I GUESS (not sure) I should use
> log.debug (or else) to log the info. into some log files. How should I do?
> Can anyone give me suggestion?
>
blkfront is the *frontend* driver for Linux, so a Linux domU running 2.6.18-xen
would use it to access the virtual disks.
You need to check blkback (blkbk) driver! That's the one running in dom0
providing virtual disks for vms.
-- Pasi
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