Re: [Xen-devel] [RFC] Is this process running on which machine?

[Akio Takebe <takebe_akio@xxxxxxxxxxxxxx>]

Hi, Ewan and all

Using /proc/xen is not good 
because unmodified driver create /proc/xen on HVM.
Which is better?
    A. chech existing /proc/xen/capabilities
    B. check existing /sys/hypervisor?

I feel A is better. 
But will xen support privcmd as unmodified driver in the future?
How do you think about it?

Best Regards,

Akio Takebe

>Hi, Ewan and all
>
>Thank you for your comments.
>I remake my scripts.
>
>I tested on dom0,domU,HVM(x86),native.
>Are there any other comments or suggestions?
>
>=================================================================
>#!/bin/bash
>
>if [ -d /proc/xen ] ; then
>        if $(grep -q control_d /proc/xen/capabilities); then
>                echo "this is dom0."
>        else
>                echo "this is domU."
>        fi
>else
>        IS_X86HVM="$(strings /proc/acpi/dsdt | grep int-xen)"
>        if [ x"${IS_X86HVM}" != x ]; then
>                echo "this is x86 hvm machine"
>        else
>                echo "this is native machine"
>        fi
>fi
>=================================================================
>
>Best Regards,
>
>Akio Takebe
>
>>On Sat, Nov 18, 2006 at 06:10:57PM +0900, Akio Takebe wrote:
>>
>>> Hi, all
>>> 
>>> I'd like to know "Is this process running on which machine?"
>>> For example, a native machien, or dom0, or domU, or HVM..
>>> 
>>> So I research codes of xen,
>>> then I make the following shell.
>>> (I haven't confirmed HVM yet because I don't use VTx machine.)
>>> What do you think about it?
>>> 
>>> =========================================================================
>>> #!/bin/bash
>>> 
>>> if [ -d /sys/hypervisor ] ; then
>>>         UUID=$(cat /sys/hypervisor/uuid)
>>>         if [ x"$UUID" == x"00000000-0000-0000-0000-000000000000" ]; then
>>>                 echo "this is dom0."
>>>         else
>>>                 echo "this is domU."
>>>         fi
>>> else
>>>         IS_HVM=$(strings /proc/acpi/dsdt | grep -i xen)
>>>         if [ x"IS_HVM" != x ]; then
>>>                 echo "this is hvm machine"
>>>         else
>>>                 echo "this is native machine"
>>>         fi
>>> fi
>>
>>I wouldn't rely upon the UUID of domain 0 being all-zeros -- there have
>>been arguments about that in the past.
>>
>>The proper mechanism for doing this is
>>
>>grep -q "control_d" /proc/xen/capabilities
>>
>>This will be true if you are in the "initial control domain"
>>(SIF_INITDOMAIN has been set).
>>
>>Ewan.
>>
>>_______________________________________________
>>Xen-devel mailing list
>>Xen-devel@xxxxxxxxxxxxxxxxxxx
>>http://lists.xensource.com/xen-devel
>
>
>_______________________________________________
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>http://lists.xensource.com/xen-devel


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