[Xen-devel] Can't set break points with Linux guest in PAE mode

[Randy Thelen <rthelen@xxxxxxxxxx>]

Folks --

One more time with the PAE request, this time I've brought up the  
Linux kernel w/ a very recent version of Xen.  (Just yesterday I  
pulled and updated my hg tree.)  I still can't set breakpoints within  
the guest domain:
# gdb vmlinux
GNU gdb 6.4-debian
<...>
(gdb) target remote roti.lab.netapp.com:9999
Remote debugging using roti.lab.netapp.com:9999
[New thread 0]
[Switching to thread 0]
0xc0100000 in startup_32 ()
(gdb) b *0xc0100000
Breakpoint 1 at 0xc0100000
(gdb) s
Single stepping until exit from function startup_32,
which has no line number information.
Warning:
Cannot insert breakpoint 1.
Error accessing memory address 0xc0100000: Input/output error.

(gdb)


My RS232 Xen console looks like:

xenbr0: port 3(vif7.0) entering learning state
xenbr0: topology change detected, propagating
xenbr0: port 3(vif7.0) entering forwarding state
xenbr0: port 3(vif7.0) entering disabled state
device vif7.0 left promiscuous mode
xenbr0: port 3(vif7.0) entering disabled state
device vif8.0 entered promiscuous mode
(XEN) DOM0: (file=mm.c, line=1688) Bad type (saw 28000001 != exp  
e0000000) for mfn 96efe (pfn 573)
(XEN) DOM0: (file=mm.c, line=606) Error getting mfn 96efe (pfn 573)  
from L1 entry 0000000096efe027 for dom8
(XEN) DOM0: (file=mm.c, line=1266) Bad get_page_from_l1e(): pl1e =  
fefa6a30, nl1e = 96efe027, ol1e = 0, gl1mfn = d8538
(XEN) DOM0: (file=mm.c, line=2283) Could not modify L1 entry: va ==  
fefa6a30, l1e == 96efe027, mfn == d8538
(I've added the two MEM_LOG() calls at line 1266 and 2283.)

Any ideas where I should begin looking?  Or is PAE support languishing?

-- Randy

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