Re: [XenAccess-devel] Error connecting to xend

[Steve B. <st...@at...>]

Bryan D. Payne wrote:
> This looks like libvirt cannot connect to the Xend deamon.  I believe
> that libvirt requires the xend-http-server to be enabled (which is no
> longer the default setting for Xen).  Try adding or uncommenting the
> following line from /etc/xen/xend-config.sxp:   
> 
> (xend-http-server yes)
> 
> After the edit you will need to restart xend:
> 
> service xend restart
> 
> I believe that this will fix your problem.  I should probably add
> something about this to the README file :-)  Let me know how it works
> out for you.  

That worked like a charm, thank you!  I can now successfully use your
module-list and process-list examples, and sure enough they match what is
reported inside the VM using lsmod and ps.  Very slick.

However, your process-data example only partially works for me (note I
modified it to take the pid as a command line argument):  

[root@localhost examples]# ./run ./process-data 1 Memory descriptor
addresses for pid = 1:
start_code = 0xffffffff
end_code = 0xc035ac8c
start_data = 0xc035ac8c
end_data = 0x00000001
start_brk = 0xdead4ead
brk = 0xffffffff
start_stack = 0xffffffff
arg_stack = 0xc035aca4
arg_end = 0xc035aca4
env_start = 0x0000008e
env_end = 0x00000017
ERROR: cannot translate this address
failed to map memory: Success

Notwithstanding the fact that I'm no kernel guy so I can't make sense of the
above output from the printaddr() function (but it does look a little odd to
me), I see that the attempt to "/* grab the memory...and print it out */"
fails (with an error code of "Success"?).  Do you have any thoughts on this?

As an unrelated question, do you think XenAccess would also work on Linux
running in an HVM domU?  My testing so far has been in a paravirtualized
domU.

Thanks for your help,

 - Steve

Stephen Brueckner, ATC-NY