vmware debug kernel

xianai

     
        
         
Debugging Linux kernels with Workstation 6.0
        
     
      
   
   
   
      We
just quietly added an exciting feature to Workstation 6.0. I believe it
will make WS6 a great tool for Linux kernel development. You can now
use gdb on your host to debug the Linux kernel running inside the VM.
No kdb, no recompiling and no need for second machine. All you need is
a single line in VM's configuration file.
To use the new feature, grab the latest build of Workstation
here
, or free 30-day evaluation
here
. Put this line into configuration file of your Linux VM:
    debugStub.listen.guest32=1
Now
whenever you run the virtual machine, you'll see the following in the
vmware.log file (debug builds will also print this message to Host
console):
    VMware Workstation is listening for debug connection on port 8832.
Run gdb on the Host, reference it to the kernel with symbols and attach to the virtual machine:
    % gdb
(gdb) file vmlinux-2.4.21-27.EL.debug
(gdb) target remote localhost:8832
That's
it. The VM is blocked now, so you can "continue" it and "^C" back to
gdb. Breakpoints, single step, memory inspection - all this works as
usual. If you have SMP VM, then each VCPU is mapped on a thread, so use
"info threads" and "thread NN" to switch between them.
Debugging the 64-bit kernel works in the same way, except you need to use a different option:
    debugStub.listen.guest64=1
and
connect to port 8864. Since gdb starts in 32-bit mode by default, you
may also need to switch it to i386:x64-64 before connecting:
(gdb) set architecture i386:x86-64
(gdb) target remote localhost:8864
The
kernels with symbols are sadly lacking on most distributions, but if
you use RHEL then this website may help (look for kernel-debuginfo rpm):
    http://people.redhat.com/duffy/debuginfo/index-js.html
The
gdb support in WS6 is experimental, so there may be rough edges here
and there. Please post on community forums if something doesn't work
right or if you have a suggestion:
   
http://communities.vmware.com/community/vmtn/general/guestdebugmonitor
There
are more debugging specific features in WS6 (for example, you can use
gdb hand-in-hand with Record/Replay!). I will describe them shortly.
               
               
               

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