Re: [Xen-devel] Anybody debugging PAE guest kernels?

[Kip Macy <kmacy@xxxxxxxxxxx>]

Randy's probably a little fed up - I don't think I responded to his last
e-mail :-/. Not out of spite, but rather overwhelmed with other things
going on.


Anyhow, the function to look at is map_domain_va_pae in
tools/libxc/xc_ptrace.c. The checks for HVM support seem to not always
happen correctly. HTH.


                        -Kip


On Wed, 4 Oct 2006, Luke Crawford wrote:

>
> You want to talk to Kip Macy;  I've done a little bit with
> freebsd7 domus, (essentially, I have hacked makefiles to make Kip Macy's
> stuff compile with -current of a few weeks ago instead of -current of a
> few months ago) but I am lacking in both skill and time, so I probably
> can not help you much.
>
> I don't know of anyone working with FreeBSD on Xen PAE, though.
>
> On Wed, 4 Oct 2006, Randy Thelen wrote:
>
> > Date: Wed, 4 Oct 2006 16:53:39 -0700
> > From: Randy Thelen <rthelen@xxxxxxxxxx>
> > To: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
> > Subject: [Xen-devel] Anybody debugging PAE guest kernels?
> >
> > Folks --
> >
> > I'm porting FreeBSD to support PAE on xen-unstable.  (Is anybody else doing
> > this?)  The kernel image I have properly communicates to Xend that the 
> > kernel
> > is PAE aware and supports [extended-cr3] semantics (which I now fully
> > understand; thanks Keir!).
> >
> > My kernel gets loaded into guest memory and I attach gdbserver-xen to it.  
> > So
> > far so good.  I can view registers, I can step, I can look at global and
> > local registers.  All is good.
> >
> > But, if I attempt to modify memory, e.g., setting a break point, XEN coughs
> > up an error:
> >
> > (XEN) DOM0: (file=mm.c, line=1750) Bad type (saw 2e000001 != exp e0000000)
> > for mfn fa693 (pfn 572)
> > (XEN) DOM0: (file=mm.c, line=618) Error getting mfn fa693 (pfn 572) from L1
> > entry 00000000fa693027 for dom7
> >
> > Is anybody doing this?  Or, am I out here alone ... again?
> >
> > Xen version 3.0-unstable (root@xxxxxxxxxxxxxx) (gcc version 4.0.3 (Ubuntu
> > 4.0.3-1ubuntu5)) Mon Aug 28 17:24:36 PDT 2006
> > Latest ChangeSet: Thu Aug 24 01:49:41 2006 +0100 11249:1ff4cc298bec
> >
> > (I'm going to update my hg repository, but I still have the question about
> > anybody else using gdbserver w/ PAE guests.)
> >
> > -- Randy
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
>
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