Thread: [coLinux-devel] Dm-crypt support in colinux with kernel 2.6.33.5

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Hi,

The last snapshot in the devel branch of colinux has not support for
dm_crypt in the default configuration for compiling the kernel. 

What is the way to use it?

Thanks in advance,

Sergio

  On 23.06.2010 13:49, Sergio Paracuellos wrote:
> The last snapshot in the devel branch of colinux has not support for
> dm_crypt in the default configuration for compiling the kernel.
>
> What is the way to use it?

DM_CRYPT depends on BLK_DEV_DM, and this depends on CONFIG_MD.

The MD and Raid tools uses special Co-Processor arithmetics, MMX and 
SSE-Instructions. So, there exist a higther risk for crashing coLinux or 
have errors in floating point operations. In the old kernel there exist 
special hack's to not enable the special CPU instructions there. All the 
MD options are currently not tested in kernel 2.6.33.

SVN revision was the last change on same problem for kernel 2.6.22:
http://colinux.svn.sourceforge.net/viewvc/colinux?view=revision&revision=1237

To test and use it, you would need to rebuild the kernel and modules 
with enabled options for
CONFIG_MD, BLK_DEV_DM, DM_CRYPT and maybe some more.

Rebuilding kernel you can do under a running coLinux. It is simple. 
Please read "Building a coLinux kernel" in the file doc/building inside 
coLinux sources. Or in the wiki:
http://colinux.wikia.com/wiki/BuildingColinux0.8.0

-- 
Henry N.

  On 23.06.2010 22:18, Henry Nestler wrote:
>    On 23.06.2010 13:49, Sergio Paracuellos wrote:
>> The last snapshot in the devel branch of colinux has not support for
>> dm_crypt in the default configuration for compiling the kernel.
>>
>> What is the way to use it?
> DM_CRYPT depends on BLK_DEV_DM, and this depends on CONFIG_MD.
>
> The MD and Raid tools uses special Co-Processor arithmetics, MMX and
> SSE-Instructions. So, there exist a higther risk for crashing coLinux or
> have errors in floating point operations. In the old kernel there exist
> special hack's to not enable the special CPU instructions there. All the
> MD options are currently not tested in kernel 2.6.33.

Oops sorry. Please forget problems with MD and Raid tools. DM is not MD ;-)

> To test and use it, you would need to rebuild the kernel and modules
> with enabled options for
> CONFIG_MD, BLK_DEV_DM, DM_CRYPT and maybe some more.

"CONFIG_DM" of curse!

Here is a build with options you missed:
   http://www.henrynestler.com/colinux/testing/devel-0.7.8/20100623-dm/

DM Crypt is a module. After unpacking the module with:
   tar xzf modules-2.6.33.5-co-0.7.8-r1486-dm-20100623.tgz -C /
And maybe running once a
   depmod
you can use it.

-- 
Henry N.

> > To test and use it, you would need to rebuild the kernel and modules
> > with enabled options for
> > CONFIG_MD, BLK_DEV_DM, DM_CRYPT and maybe some more.
> 
> "CONFIG_DM" of curse!
> 
> Here is a build with options you missed:
>    http://www.henrynestler.com/colinux/testing/devel-0.7.8/20100623-dm/
> 
> DM Crypt is a module. After unpacking the module with:
>    tar xzf modules-2.6.33.5-co-0.7.8-r1486-dm-20100623.tgz -C /
> And maybe running once a
>    depmod
> you can use it.
> 

Thanks Henry,

No problems with the build and the use of dm-crypt. It works for me.

Cheers,

Sergio

  On 25.06.2010 03:35, Sergio Paracuellos wrote:
>>> To test and use it, you would need to rebuild the kernel and modules
>>> with enabled options for
>>> CONFIG_MD, BLK_DEV_DM, DM_CRYPT and maybe some more.
>> "CONFIG_DM" of curse!
> [...]
>
> No problems with the build and the use of dm-crypt. It works for me.

Ok, thanks. Is enabled per default now.

-- 
Henry N.

Thread: [coLinux-devel] Dm-crypt support in colinux with kernel 2.6.33.5

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