QEMU and kernel testing
 

So I have some custom kernels I need to build and such, and QEMU is the preferred method of testing them.

When using QEMU though, there is no scroll back to the "dmesg" output. And obviously I cant grab the dmesg file after. Also, none of the redirection methods, including TCP, telnet, file, or anything actually put this output into a file.

So. How do I get ALL of the text output from QEMU into a file to debug? OR, how do you kernel experts debug things like this in QEMU?

normally, you would ssh into the VM and pipe dmesg into less

Im not following.

If I compile a new kernel and intramfs and boot them up in QEMU, and the kernel crashes halfway through the bootup,.. how am i supposed to SSH to the instance?

I was hoping to find a way to catch all of the kernel text output from start to crash from QEMU. How do kernel/qemu people go about doing that? Because I cannot find the documentation to explain how to do that!

I thought you meant running the actual build process under QEMU. I'd try to use the qemu-monitor console if I were you:
http://stackoverflow.com/questions/1...-host-terminal

You could send your boot messages to a serial device and monitor the serial console of qemu on your host.