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Re: [Qemu-devel] [PATCH] Add "tee" option to qemu char device


From: Stefano Stabellini
Subject: Re: [Qemu-devel] [PATCH] Add "tee" option to qemu char device
Date: Thu, 7 Jul 2011 12:56:59 +0100
User-agent: Alpine 2.00 (DEB 1167 2008-08-23)

On Thu, 7 Jul 2011, Chunyan Liu wrote:
> In previous thread "Support logging xen-guest console", it's considered that
> adding a "tee" option to char layer is a more generic way and makes more 
> sense.
> http://lists.nongnu.org/archive/html/qemu-devel/2011-06/msg03011.html 
> 
> Following is an implementation of "tee" option to char device. It could be 
> used
> as follows:
>     -chardev pty,id=id,path=path,[mux=on|off],[tee=filepath]
>     -serial tee:filepath,pty
> With "tee" option, "pty" output would be duplicated to filepath.
> 
> I've ported this patch to qemu-xen and tested with xen guests already. But I'm
> not very clear how to test the qemu binary directly. Any info?

Configure your Xen HVM guest to use the serial.

Compile Qemu as emulator:

./configure --disable-xen --target-list=x86_64-softmmu

then use qemu directly to boot your guest:

./qemu-system-x86_64 -hda /path/to/file -serial tree:/path/to/log,pty

you can connect to the pty using a program like picocom:

picocom -b 115200 /dev/pts/$NUM



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