kdb does not support XEN?

kdb does not support XEN?

[qihao.xi]

Hi  all,

I want to debug Dom0 driver when installing XEN SERVER5.6 ISO. 
The XS5.6 kernel is 2.6.27.42-0.1.1  I downloaded "kdb-v4.4-2.6.27-rc8-common-1.1" and
"kdb-v4.4-2.6.27-rc8-x86-1". After patching, kdb configure does not
appear.

I found the below:
# cat  arch/x86/Kconfig.debug|grep -A10 KDB
config KDB
	bool "Built-in Kernel Debugger support"
		depends on DEBUG_KERNEL && !XEN

This mean kdb does not support XEN? If yes, how to debug Dom0 driver?
Thanks!

Re: kdb does not support XEN?

[qihao.xi]

On Tue, Dec 21, 2010 at 11:47:01AM +0800, qihao.xi wrote:
>Hi  all,
>
>I want to debug Dom0 driver when installing XEN SERVER5.6 ISO. 
>The XS5.6 kernel is 2.6.27.42-0.1.1  I downloaded "kdb-v4.4-2.6.27-rc8-common-1.1" and
>"kdb-v4.4-2.6.27-rc8-x86-1". After patching, kdb configure does not
>appear.
>
>I found the below:
># cat  arch/x86/Kconfig.debug|grep -A10 KDB
>config KDB
>	bool "Built-in Kernel Debugger support"
>		depends on DEBUG_KERNEL && !XEN
>
>This mean kdb does not support XEN? If yes, how to debug Dom0 driver?
>Thanks!
>

I unpack the XS5.6 source code "linux-2.6.27.42-0.1.1.xs5.6.0.44.111158".
In "linux-2.6.27.42-0.1.1.xs5.6.0.44.111158/arch/x86/Kconfig.debug"

config KDB
	bool "Built-in Kernel Debugger support"
	depends on DEBUG_KERNEL && !XEN

Why disable XEN? I should use unstable kernel to debug? How to get it? 
Any suggestion is appreciated. 

Thanks!

Re: kdb does not support XEN?

[Todd Deshane]

On Mon, Dec 20, 2010 at 10:47 PM, qihao.xi <qiho.xi@gmail.com> wrote:
> Hi  all,
>
> I want to debug Dom0 driver when installing XEN SERVER5.6 ISO.
> The XS5.6 kernel is 2.6.27.42-0.1.1  I downloaded "kdb-v4.4-2.6.27-rc8-common-1.1" and
> "kdb-v4.4-2.6.27-rc8-x86-1". After patching, kdb configure does not
> appear.
>
> I found the below:
> # cat  arch/x86/Kconfig.debug|grep -A10 KDB
> config KDB
>        bool "Built-in Kernel Debugger support"
>                depends on DEBUG_KERNEL && !XEN
>
> This mean kdb does not support XEN? If yes, how to debug Dom0 driver?
> Thanks!
>

Looks like there is a version for Xen:

http://xen.markmail.org/search/?q=gdbsx+dom0#query:gdbsx%20dom0+page:3+mid:j6vtz7mdlrwqdyjp+state:results

http://xenbits.xensource.com/ext/debuggers.hg?file/926cc93296dd/xen/kdb/README

Hope that helps.

Thanks,
Todd

Re: kdb does not support XEN?

[qihao.xi]

On Tue, Dec 21, 2010 at 09:37:15PM -0500, Todd Deshane wrote:
>On Mon, Dec 20, 2010 at 10:47 PM, qihao.xi <qiho.xi@gmail.com> wrote:
>> Hi  all,
>>
>> I want to debug Dom0 driver when installing XEN SERVER5.6 ISO.
>> The XS5.6 kernel is 2.6.27.42-0.1.1  I downloaded "kdb-v4.4-2.6.27-rc8-common-1.1" and
>> "kdb-v4.4-2.6.27-rc8-x86-1". After patching, kdb configure does not
>> appear.
>>
>> I found the below:
>> # cat  arch/x86/Kconfig.debug|grep -A10 KDB
>> config KDB
>>        bool "Built-in Kernel Debugger support"
>>                depends on DEBUG_KERNEL && !XEN
>>
>> This mean kdb does not support XEN? If yes, how to debug Dom0 driver?
>> Thanks!
>>
>
>Looks like there is a version for Xen:
>
>http://xen.markmail.org/search/?q=gdbsx+dom0#query:gdbsx%20dom0+page:3+mid:j6vtz7mdlrwqdyjp+state:results
>
>http://xenbits.xensource.com/ext/debuggers.hg?file/926cc93296dd/xen/kdb/README
>
>Hope that helps.

In fact, I want to debug the modules against "/boot/vmlinuz". Not the "boot/xen.gz"
When XEN installing with ISO, it first load xen.gz,then load vmlinuz,load my driver to check disk.
It hanged at "Checking for existing products...". This is my scsi driver problem.

LABEL install
	KERNEL mboot.c32
	APPEND /boot/xen.gz dom0_mem=1024M com1=115200,8n1 console=com1,vga --- /boot/vmlinuz xencons=hvc console=ttyS0,115200 extramodules=my_scsi --- /install.img

I got vmlinuz's kernel source from XS5.6 source ISO image. It already include kdb patch.
But it disable XEN to ue kdb.  I can need build xen.gdb to debug vmlinuz? I'm a newbie for XEN.
Any suggestion is appreciated.  Thanks!

Re: kdb does not support XEN?

[Mukesh Rathor]

On Wed, 22 Dec 2010 12:02:04 +0800
"qihao.xi" <qiho.xi@gmail.com> wrote:

> On Tue, Dec 21, 2010 at 09:37:15PM -0500, Todd Deshane wrote:
> >On Mon, Dec 20, 2010 at 10:47 PM, qihao.xi <qiho.xi@gmail.com> wrote:
> >> Hi  all,
> >>
> >> I want to debug Dom0 driver when installing XEN SERVER5.6 ISO.
> >> The XS5.6 kernel is 2.6.27.42-0.1.1  I downloaded
> >> "kdb-v4.4-2.6.27-rc8-common-1.1" and "kdb-v4.4-2.6.27-rc8-x86-1".
> >> After patching, kdb configure does not appear.
> >>
> >> I found the below:
> >> # cat  arch/x86/Kconfig.debug|grep -A10 KDB
> >> config KDB
> >>        bool "Built-in Kernel Debugger support"
> >>                depends on DEBUG_KERNEL && !XEN
> >>
> >> This mean kdb does not support XEN? If yes, how to debug Dom0
> >> driver? Thanks!
> >>
> >
> >Looks like there is a version for Xen:
> >
> >http://xen.markmail.org/search/?q=gdbsx+dom0#query:gdbsx%20dom0+page:3+mid:j6vtz7mdlrwqdyjp+state:results
> >
> >http://xenbits.xensource.com/ext/debuggers.hg?file/926cc93296dd/xen/kdb/README
> >
> >Hope that helps.
> 
> In fact, I want to debug the modules against "/boot/vmlinuz". Not the
> "boot/xen.gz" When XEN installing with ISO, it first load xen.gz,then
> load vmlinuz,load my driver to check disk. It hanged at "Checking for
> existing products...". This is my scsi driver problem.
> 
> LABEL install
> 	KERNEL mboot.c32
> 	APPEND /boot/xen.gz dom0_mem=1024M com1=115200,8n1
> console=com1,vga --- /boot/vmlinuz xencons=hvc console=ttyS0,115200
> extramodules=my_scsi --- /install.img
> 
> I got vmlinuz's kernel source from XS5.6 source ISO image. It already
> include kdb patch. But it disable XEN to ue kdb.  I can need build
> xen.gdb to debug vmlinuz? I'm a newbie for XEN. Any suggestion is
> appreciated.  Thanks!

http://xenbits.xensource.com/ext/debuggers.hg?file/926cc93296dd/xen/kdb/README

is totally independent of kdb patches in linux. It has nothing to do
with linux kdb. You'll not need to kdb patches in linux to use it. It
is a xen built-in debugger that will let you debug xen or domains. Take
a look at the README.

thanks
Mukesh