[RFC] Is this process running on which machine?

[RFC] Is this process running on which machine?

[Akio Takebe]

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
=========================================================================

Best Regards,

Akio Takebe

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

[Ewan Mellor]

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.

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

[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@lists.xensource.com
>http://lists.xensource.com/xen-devel

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

[Akio Takebe]

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@lists.xensource.com
>>http://lists.xensource.com/xen-devel
>
>
>_______________________________________________
>Xen-devel mailing list
>Xen-devel@lists.xensource.com
>http://lists.xensource.com/xen-devel

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

[Andrew D. Ball]

You can use dmidecode on HVM domU's running Linux.  This reads the
SMBIOS tables.  The system information type (type 1) will tell you that
it's an HVM domU.

Peace.
Andrew

On Mon, 2006-11-20 at 12:37 +0900, Akio Takebe wrote:
> 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@lists.xensource.com
> >>http://lists.xensource.com/xen-devel
> >
> >
> >_______________________________________________
> >Xen-devel mailing list
> >Xen-devel@lists.xensource.com
> >http://lists.xensource.com/xen-devel
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel

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

[Akio Takebe]

Hi, Andrew

Thank you for you comment.

>You can use dmidecode on HVM domU's running Linux.  This reads the
>SMBIOS tables.  The system information type (type 1) will tell you that
>it's an HVM domU.
Yes, dmidecode is a good way.
The following way is also another good way.
lspci | grep "5853:0001" 

I'll remake the scripts.
I'd like to make a command like "uname".

Best Regars,

Akio Takebe

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

[Akio Takebe]

Hi,

I remake my scripts.
I found dmidecode sometimes don't work on HVM domain
and it is not installed on default system of some distribution.
So I use /proc/acpi/dsdt.
Please comments.

===================================================================
#!/bin/bash

IS_X86HVM="$(strings /proc/acpi/dsdt | grep int-xen)"
if [ x"${IS_X86HVM}" != x ]; then
        echo "this is x86 hvm machine"
elif [ -f /proc/xen/capabilities ] ; then
        if $(grep -q control_d /proc/xen/capabilities); then
                echo "this is dom0."
        else
                echo "this is domU."
        fi
else
                echo "this is native machine"
fi
===================================================================

Best Regards,

Akio Takebe

>Hi, Andrew
>
>Thank you for you comment.
>
>>You can use dmidecode on HVM domU's running Linux.  This reads the
>>SMBIOS tables.  The system information type (type 1) will tell you that
>>it's an HVM domU.
>Yes, dmidecode is a good way.
>The following way is also another good way.
>lspci | grep "5853:0001" 
>
>I'll remake the scripts.
>I'd like to make a command like "uname".
>
>Best Regars,
>
>Akio Takebe
>
>
>
>_______________________________________________
>Xen-devel mailing list
>Xen-devel@lists.xensource.com
>http://lists.xensource.com/xen-devel

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

[Akio Takebe]

Hi,

I remake it again.
I tested native, dom0, domU, domVTx on x86.
If you have comments, please give me.

----------------------------------------------------------
#!/bin/bash
declare -i IS_HVM=0
declare -i IS_PARA=0

check_hvm()
{
        IS_X86HVM="$(strings /proc/acpi/dsdt | grep int-xen)"
        if [ x"${IS_X86HVM}" != x ]; then
                echo "x86hvm"
                IS_HVM=1
        fi
}

check_para()
{
        if $(grep -q control_d /proc/xen/capabilities); then
                echo "dom0"
                IS_PARA=1
        else
                echo "domU"
                IS_PARA=1
        fi
}

#### main ####
if [ -f /proc/acpi/dsdt ]; then 
        check_hvm
fi
if [ ${IS_HVM} -eq 0 ]; then
        if [ -f /proc/xen/capabilities ] ; then
                check_para
        fi
fi
if [ ${IS_HVM} -eq 0 -a ${IS_PARA} -eq 0 ]; then
        echo "native"
fi
----------------------------------------------------------

Best Regards,

Akio Takebe