Issues while "Debugging Windows Kernel" running on KVM

Issues while "Debugging Windows Kernel" running on KVM

[Muppana, Bhaskar]

Hi,

I am facing issues while trying to debug Windows XP kernel running on
top of Linux KVM. 

I have to debug Windows XP kernel running in a VM. I have dedicated
ttyS0 on the host to the guest. I am using the following command to
bring up Windows VM.


/usr/local/kvm/bin/qemu-system-x86_64 \
          -hda /opt/vdisk.img \
          -boot c \
          -m 512 \
          -net nic,model=rtl8139,macaddr=52:54:00:12:34:56 \
          -net tap,ifname=qtap0,script=no \
          -smp 1 \
          -usb \
          -usbdevice tablet \
          -localtime \
          -serial /dev/ttyS0 



I have another machine, running Windows XP, connected to the Linux host
through serial cable. 

							--------
						     |Windows |
						     |  VM    |	
						     |(target)|
							--------	
 ---------------				 ----------------
|  Windows Host | ----------------- | Linux with KVM |
 ---------------				 ----------------

I am able to send messages between Windows host and target through
serial ports (tested using windows power shell). But, I am not able to
use Win DBG (Kernel Debugger) in host to connect to target. Target is
getting stuck while booting. 

Debug enabled Windows entry in boot.ini:

multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP
Professional" /fastdetect /debugport=COM1 /baudrate=115200


Can someone please help me regarding this?



Thanks,
Bhaskar

Re: Issues while "Debugging Windows Kernel" running on KVM

[Dor Laor]

Can you try http://kvm.qumranet.com/kvmwiki/WindowsGuestDebug
You can use windows host as a VM too.
Since (in the past) there was a problem with the virtual serial polling 
you can use -no-kvm and the
qemu patch, as described in the wiki.
Good luck, Dor.

Muppana, Bhaskar wrote:
> Hi,
>
> I am facing issues while trying to debug Windows XP kernel running on
> top of Linux KVM. 
>
> I have to debug Windows XP kernel running in a VM. I have dedicated
> ttyS0 on the host to the guest. I am using the following command to
> bring up Windows VM.
>
>
> /usr/local/kvm/bin/qemu-system-x86_64 \
>           -hda /opt/vdisk.img \
>           -boot c \
>           -m 512 \
>           -net nic,model=rtl8139,macaddr=52:54:00:12:34:56 \
>           -net tap,ifname=qtap0,script=no \
>           -smp 1 \
>           -usb \
>           -usbdevice tablet \
>           -localtime \
>           -serial /dev/ttyS0 
>
>
>
> I have another machine, running Windows XP, connected to the Linux host
> through serial cable. 
>
> 							--------
> 						     |Windows |
> 						     |  VM    |	
> 						     |(target)|
> 							--------	
>  ---------------				 ----------------
> |  Windows Host | ----------------- | Linux with KVM |
>  ---------------				 ----------------
>
> I am able to send messages between Windows host and target through
> serial ports (tested using windows power shell). But, I am not able to
> use Win DBG (Kernel Debugger) in host to connect to target. Target is
> getting stuck while booting. 
>
> Debug enabled Windows entry in boot.ini:
>
> multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP
> Professional" /fastdetect /debugport=COM1 /baudrate=115200
>
>
> Can someone please help me regarding this?
>
>
>
> Thanks,
> Bhaskar
>
>
>
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