Re: [Xen-devel] IOMMU fault with IGD passthrough setup on XEN 4.8.0

["G.R." <firemeteor@xxxxxxxxxxxxxxxxxxxxx>]

On Tue, Jan 17, 2017 at 12:11 AM, Jan Beulich <JBeulich@xxxxxxxx> wrote:

>>> On 16.01.17 at 16:15, <firemeteor@users.sourceforge.net> wrote:
> On Mon, Jan 16, 2017 at 9:56 PM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>
>> For building a debug hypervisor, all you need to do is set
>> CONFIG_DEBUG=y in xen/.config. I don't think there are any
>> knobs to avoid log flooding - after all you've asked for the
>> verbosity via "iommu=verbose,debug".
>>
> I assume I do not need to redo the ./configure here.
> And I assume the xen/.config here refers to the root of the repos instead
> of the xen.git/xen subdirectory?

I don't understand - I'd normally assume the two to be the same
(with just different context made visible).

I was trying to figure out if I followed your instruction properly.

My first attempt only resulted in a binary with similar size with my previous one.

Probably something went wrong.

I put my source under /nas/src/xen, and I have a /nas/src/xen/.config file for the

python layout knob according to the wiki.

My first attempt put th CONFIG_DEBUG=y line in the same file.

But now I suspect if I should use /nas/src/xen/xen/.config (note the double 'xen').

> I couldn't find obvious debug knob in the gcc command-line, even though the
> build is with -O1.

Nor do I understand this remark.

I checked the GCC command-lines during build process with the .config change, with the expectation of something like -DDEBUG -g etc.

But actually I saw none of them, only saw -O1.

 

G.R.

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