Re: [Qemu-devel] Tracing guest memory accesses

["Diwaker Gupta" <diwaker.lists@gmail.com>]

On 12/16/06, Daniel Jacobowitz <drow@false.org> wrote:
> On Sat, Dec 16, 2006 at 07:42:46PM -0800, Diwaker Gupta wrote:
> > o do these changes seem correct? As in, do they actually track the
> > read/write memory accesses done by the guest? I was concerned because
> > when I start a guest, I see a whole lot of writes and not as many
> > reads, which seems a little counter intuitive.
>
> No.  Those are I/O device accesses, not memory accesses.  Look at the
> softmmu code instead.

Like I said, I did add some debugging code to softmmu_template.h. The
read/writes I'm seeing are being generated by that softmmu debugging
code, not the iommu code. Sorry if I wasn't clear. Is there some other
softmmu code I should be looking at?

> It may be easiest to add some new instrumentation in the translation
> code for whatever target you're interested in.

I'm just focusing on Linux i386. I'm only beginning to explore the
qemu source, so any pointer to files/functions I should look at will
be much appreciated!

TIA,
Diwaker
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