IDA remote debug Linux Kernel
 

Hello,

I am using arm-gdb to debug kernel and user level code running under QEMU. QEMU has built in gdbserver that stops VM on power-up and waits for debugger connection. Is it possible to do the same with IDA? All I can find is debugging user processes with IDA, not kernel...

Thanks!

You can at least debug the windows kernel using IDA+GDB (if you enable the GDB debugging interface in VMWare, for instance). I haven't tried the same for Linux or QEMU, but I think it should work. You can even set the resp. options to debug real mode code in the debugger specific settings of the GDB module.
This might help:

http://www.hex-rays.com/products/ida/support/tutorials/debugging_gdb_windows_vmware.pdf

I was able to connect to gdbserver running in QEMU. Is there a way to load source files for known kernel modules? i.e. I can debug everything fine, but only with disassembly. Not sure if IDA can load source files from GNU debug symbols

Nope, source level debugging is not possible, yet. However, IDA 6.3 will have source level debugging, so you just have to wait a few weeks ;)
The beta should start in a couple of days.