[Xen-devel] Anybody debugging PAE guest kernels?

[Randy Thelen <rthelen@xxxxxxxxxx>]

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

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