Re: [libvirt] [PATCH LIBVIRT] libxl: Recognise ARM architectures

Re: [libvirt] [PATCH LIBVIRT] libxl: Recognise ARM architectures

[Daniel P. Berrange]

On Wed, Feb 26, 2014 at 12:34:17PM +0000, Ian Campbell wrote:
> Only tested on v7 but the v8 equivalent seems pretty obvious.
> 
> XEN_CAP_REGEX already accepts more than it should (e.g. x86_64p or x86_32be)
> but I have stuck with the existing pattern.
> 
> With this I can create a guest from:
>   <domain type='xen'>
>     <name>libvirt-test</name>
>     <uuid>6343998e-9eda-11e3-98f6-77252a7d02f3</uuid>
>     <memory>393216</memory>
>     <currentMemory>393216</currentMemory>
>     <vcpu>1</vcpu>
>     <os>
>       <type arch='armv7l' machine='xenpv'>linux</type>
>       <kernel>/boot/vmlinuz-arm-native</kernel>
>       <cmdline>console=hvc0 earlyprintk debug root=/dev/xvda1</cmdline>
>     </os>
>     <clock offset='utc'/>
>     <on_poweroff>destroy</on_poweroff>
>     <on_reboot>restart</on_reboot>
>     <on_crash>destroy</on_crash>
>     <devices>
>       <disk type='block' device='disk'>
>         <source dev='/dev/marilith-n0/debian-disk'/>
>         <target dev='xvda1'/>
>       </disk>
>       <interface type='bridge'>
>         <mac address='8e:a7:8e:3c:f4:f6'/>
>         <source bridge='xenbr0'/>
>       </interface>
>     </devices>
>   </domain>
> 
> Using virsh create and I can destroy it too.
> 
> Currently virsh console fails with:
>   Connected to domain libvirt-test
>   Escape character is ^]
>   error: internal error: cannot find character device <null>
> 
> I haven't investigated yet.

That'll be because no <console> or <serial> device is
listed in your config above I expect. Also looks like
bogus error handling in the console API, not checking
for <null>.


ACK

Regards,
Daniel
-- 
|: http://berrange.com      -o-    http://www.flickr.com/photos/dberrange/ :|
|: http://libvirt.org              -o-             http://virt-manager.org :|
|: http://autobuild.org       -o-         http://search.cpan.org/~danberr/ :|
|: http://entangle-photo.org       -o-       http://live.gnome.org/gtk-vnc :|

Re: [libvirt] [PATCH LIBVIRT] libxl: Recognise ARM architectures

[Ian Campbell]

On Wed, 2014-02-26 at 12:37 +0000, Daniel P. Berrange wrote:
> On Wed, Feb 26, 2014 at 12:34:17PM +0000, Ian Campbell wrote:
> > Currently virsh console fails with:
> >   Connected to domain libvirt-test
> >   Escape character is ^]
> >   error: internal error: cannot find character device <null>
> > 
> > I haven't investigated yet.
> 
> That'll be because no <console> or <serial> device is
> listed in your config above I expect. Also looks like
> bogus error handling in the console API, not checking
> for <null>.

Thanks. I've just tried (inside <devices>...</...>):
         <console tty='/dev/pts/5'/>
and
     <console type='pty'>
      <target port='0'/>
    </console>
which I gleaned from http://libvirt.org/drvxen.html but neither seem to
do the trick (and the first ones use of an explicit pts looks odd to
me...).

> ACK

Thanks.

Ian.

Re: [libvirt] [PATCH LIBVIRT] libxl: Recognise ARM architectures

[Eric Blake]

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On 02/26/2014 05:37 AM, Daniel P. Berrange wrote:
> On Wed, Feb 26, 2014 at 12:34:17PM +0000, Ian Campbell wrote:
>> Only tested on v7 but the v8 equivalent seems pretty obvious.
>>
>> XEN_CAP_REGEX already accepts more than it should (e.g. x86_64p or x86_32be)
>> but I have stuck with the existing pattern.
>>
>> With this I can create a guest from:
>>   <domain type='xen'>
>>     <name>libvirt-test</name>
>>     <uuid>6343998e-9eda-11e3-98f6-77252a7d02f3</uuid>
>>     <memory>393216</memory>
>>     <currentMemory>393216</currentMemory>
>>     <vcpu>1</vcpu>
>>     <os>
>>       <type arch='armv7l' machine='xenpv'>linux</type>
>>       <kernel>/boot/vmlinuz-arm-native</kernel>
>>       <cmdline>console=hvc0 earlyprintk debug root=/dev/xvda1</cmdline>
>>     </os>

> 
> ACK

I've gone ahead and pushed the patch.


-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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Re: [libvirt] [PATCH LIBVIRT] libxl: Recognise ARM architectures

[Olaf Hering]

On Wed, Feb 26, Ian Campbell wrote:

> On Wed, 2014-02-26 at 12:37 +0000, Daniel P. Berrange wrote:
> > On Wed, Feb 26, 2014 at 12:34:17PM +0000, Ian Campbell wrote:
> > > Currently virsh console fails with:
> > >   Connected to domain libvirt-test
> > >   Escape character is ^]
> > >   error: internal error: cannot find character device <null>
> > That'll be because no <console> or <serial> device is
> > listed in your config above I expect. Also looks like
> > bogus error handling in the console API, not checking
> > for <null>.
> Thanks. I've just tried (inside <devices>...</...>):
>          <console tty='/dev/pts/5'/>
> and
>      <console type='pty'>
>       <target port='0'/>
>     </console>
> which I gleaned from http://libvirt.org/drvxen.html but neither seem to
> do the trick (and the first ones use of an explicit pts looks odd to
> me...).

I learned yesterday this should be "serial" instead of "console", maybe
it fixes also your case.

Olaf

Re: [libvirt] [PATCH LIBVIRT] libxl: Recognise ARM architectures

[Ian Campbell]

On Wed, 2014-02-26 at 15:00 +0100, Olaf Hering wrote:
> On Wed, Feb 26, Ian Campbell wrote:
> 
> > On Wed, 2014-02-26 at 12:37 +0000, Daniel P. Berrange wrote:
> > > On Wed, Feb 26, 2014 at 12:34:17PM +0000, Ian Campbell wrote:
> > > > Currently virsh console fails with:
> > > >   Connected to domain libvirt-test
> > > >   Escape character is ^]
> > > >   error: internal error: cannot find character device <null>
> > > That'll be because no <console> or <serial> device is
> > > listed in your config above I expect. Also looks like
> > > bogus error handling in the console API, not checking
> > > for <null>.
> > Thanks. I've just tried (inside <devices>...</...>):
> >          <console tty='/dev/pts/5'/>
> > and
> >      <console type='pty'>
> >       <target port='0'/>
> >     </console>
> > which I gleaned from http://libvirt.org/drvxen.html but neither seem to
> > do the trick (and the first ones use of an explicit pts looks odd to
> > me...).
> 
> I learned yesterday this should be "serial" instead of "console", maybe
> it fixes also your case.

My understanding was that this was for HVM guests, whereas ARM has a PV
console but I suppose I should try it anyway. I've got a flight to catch
so it'll be a few days I expect.

Thanks,

Ian.

Re: [libvirt] [PATCH LIBVIRT] libxl: Recognise ARM architectures

[Daniel P. Berrange]

On Wed, Feb 26, 2014 at 02:55:13PM +0000, Ian Campbell wrote:
> On Wed, 2014-02-26 at 15:00 +0100, Olaf Hering wrote:
> > On Wed, Feb 26, Ian Campbell wrote:
> > 
> > > On Wed, 2014-02-26 at 12:37 +0000, Daniel P. Berrange wrote:
> > > > On Wed, Feb 26, 2014 at 12:34:17PM +0000, Ian Campbell wrote:
> > > > > Currently virsh console fails with:
> > > > >   Connected to domain libvirt-test
> > > > >   Escape character is ^]
> > > > >   error: internal error: cannot find character device <null>
> > > > That'll be because no <console> or <serial> device is
> > > > listed in your config above I expect. Also looks like
> > > > bogus error handling in the console API, not checking
> > > > for <null>.
> > > Thanks. I've just tried (inside <devices>...</...>):
> > >          <console tty='/dev/pts/5'/>
> > > and
> > >      <console type='pty'>
> > >       <target port='0'/>
> > >     </console>
> > > which I gleaned from http://libvirt.org/drvxen.html but neither seem to
> > > do the trick (and the first ones use of an explicit pts looks odd to
> > > me...).
> > 
> > I learned yesterday this should be "serial" instead of "console", maybe
> > it fixes also your case.
> 
> My understanding was that this was for HVM guests, whereas ARM has a PV
> console but I suppose I should try it anyway. I've got a flight to catch
> so it'll be a few days I expect.

Yep, if ARM has a PV console, then we'd need to add  tiny bit to the XML
to allow us to configure that explicitly, similar to how we do for KVM's
virtio-console support.


Regards,
Daniel
-- 
|: http://berrange.com      -o-    http://www.flickr.com/photos/dberrange/ :|
|: http://libvirt.org              -o-             http://virt-manager.org :|
|: http://autobuild.org       -o-         http://search.cpan.org/~danberr/ :|
|: http://entangle-photo.org       -o-       http://live.gnome.org/gtk-vnc :|

Re: [libvirt] [PATCH LIBVIRT] libxl: Recognise ARM architectures

[Ian Campbell]

On Wed, 2014-02-26 at 06:34 -0700, Eric Blake wrote:
> On 02/26/2014 05:37 AM, Daniel P. Berrange wrote:
> > On Wed, Feb 26, 2014 at 12:34:17PM +0000, Ian Campbell wrote:
> >> Only tested on v7 but the v8 equivalent seems pretty obvious.
> >>
> >> XEN_CAP_REGEX already accepts more than it should (e.g. x86_64p or x86_32be)
> >> but I have stuck with the existing pattern.
> >>
> >> With this I can create a guest from:
> >>   <domain type='xen'>
> >>     <name>libvirt-test</name>
> >>     <uuid>6343998e-9eda-11e3-98f6-77252a7d02f3</uuid>
> >>     <memory>393216</memory>
> >>     <currentMemory>393216</currentMemory>
> >>     <vcpu>1</vcpu>
> >>     <os>
> >>       <type arch='armv7l' machine='xenpv'>linux</type>
> >>       <kernel>/boot/vmlinuz-arm-native</kernel>
> >>       <cmdline>console=hvc0 earlyprintk debug root=/dev/xvda1</cmdline>
> >>     </os>
> 
> > 
> > ACK
> 
> I've gone ahead and pushed the patch.

Wow, that was quick, thanks!

Ian.

Re: [libvirt] [PATCH LIBVIRT] libxl: Recognise ARM architectures

[Ian Campbell]

On Wed, 2014-02-26 at 15:01 +0000, Daniel P. Berrange wrote:
> Yep, if ARM has a PV console, then we'd need to add  tiny bit to the XML
> to allow us to configure that explicitly, similar to how we do for KVM's
> virtio-console support.

Do you mean I need to add something to the XML config snippet, or I need
to add some special handling in the XML parser/consumer?

I've grepped around the virtio-console stuff and I'm none the wiser.

Thanks,
Ian.

Re: [libvirt] [PATCH LIBVIRT] libxl: Recognise ARM architectures

[Daniel P. Berrange]

On Fri, Feb 28, 2014 at 02:12:30AM +0000, Ian Campbell wrote:
> On Wed, 2014-02-26 at 15:01 +0000, Daniel P. Berrange wrote:
> > Yep, if ARM has a PV console, then we'd need to add  tiny bit to the XML
> > to allow us to configure that explicitly, similar to how we do for KVM's
> > virtio-console support.
> 
> Do you mean I need to add something to the XML config snippet, or I need
> to add some special handling in the XML parser/consumer?
> 
> I've grepped around the virtio-console stuff and I'm none the wiser.

Opps, yes, I should have explained this better, since our docs here are
about as clear as mud.

With traditional x86 paravirt Xen, we just have the plain paravirt console
devices

    <console type='pty'>
      <target type='xen'/>
    </console>

With x86  fullvirt Xen/KVM/QEMU, the console type just defaults to being
a serial port so you would usually just add

    <serial type='pty'>
    </serial>

and then libvirt would automatically add a <console> with

    <console type='pty'>
      <target type='serial'/>
    </console>


With x86 fullvirt KVM, we also have support for virtio which is
done using

    <console type='pty'>
      <target type='virtio'/>
    </console>


So actually this leads me to ask what kind of console Arm fullvirt Xen
guests actually have ? If they just use the traditional Xen paravirt
console, then we just need to make sure that this works for them by
default:

    <console type='pty'>
      <target type='xen'/>
    </console>


If there's a different type of console device that's not related to
the Xen paravirt console device, then we'd need to invent a new
<target type='xxx'/> value for Arm.

Regards,
Daniel
-- 
|: http://berrange.com      -o-    http://www.flickr.com/photos/dberrange/ :|
|: http://libvirt.org              -o-             http://virt-manager.org :|
|: http://autobuild.org       -o-         http://search.cpan.org/~danberr/ :|
|: http://entangle-photo.org       -o-       http://live.gnome.org/gtk-vnc :|

Re: [libvirt] [PATCH LIBVIRT] libxl: Recognise ARM architectures

[Stefano Stabellini]

On Fri, 28 Feb 2014, Daniel P. Berrange wrote:
> On Fri, Feb 28, 2014 at 02:12:30AM +0000, Ian Campbell wrote:
> > On Wed, 2014-02-26 at 15:01 +0000, Daniel P. Berrange wrote:
> > > Yep, if ARM has a PV console, then we'd need to add  tiny bit to the XML
> > > to allow us to configure that explicitly, similar to how we do for KVM's
> > > virtio-console support.
> > 
> > Do you mean I need to add something to the XML config snippet, or I need
> > to add some special handling in the XML parser/consumer?
> > 
> > I've grepped around the virtio-console stuff and I'm none the wiser.
> 
> Opps, yes, I should have explained this better, since our docs here are
> about as clear as mud.
> 
> With traditional x86 paravirt Xen, we just have the plain paravirt console
> devices
> 
>     <console type='pty'>
>       <target type='xen'/>
>     </console>
> 
> With x86  fullvirt Xen/KVM/QEMU, the console type just defaults to being
> a serial port so you would usually just add
> 
>     <serial type='pty'>
>     </serial>
> 
> and then libvirt would automatically add a <console> with
> 
>     <console type='pty'>
>       <target type='serial'/>
>     </console>
> 
> 
> With x86 fullvirt KVM, we also have support for virtio which is
> done using
> 
>     <console type='pty'>
>       <target type='virtio'/>
>     </console>
> 
> 
> So actually this leads me to ask what kind of console Arm fullvirt Xen
> guests actually have ? If they just use the traditional Xen paravirt
> console, then we just need to make sure that this works for them by
> default:
> 
>     <console type='pty'>
>       <target type='xen'/>
>     </console>
> 
> 
> If there's a different type of console device that's not related to
> the Xen paravirt console device, then we'd need to invent a new
> <target type='xxx'/> value for Arm.

It is just the traditional Xen paravirt console.

Re: [libvirt] [PATCH LIBVIRT] libxl: Recognise ARM architectures

[Ian Campbell]

On Fri, 2014-02-28 at 14:29 +0000, Stefano Stabellini wrote:
> On Fri, 28 Feb 2014, Daniel P. Berrange wrote:
> > So actually this leads me to ask what kind of console Arm fullvirt Xen
> > guests actually have ? If they just use the traditional Xen paravirt
> > console, then we just need to make sure that this works for them by
> > default:
> > 
> >     <console type='pty'>
> >       <target type='xen'/>
> >     </console>
> > 
> > 
> > If there's a different type of console device that's not related to
> > the Xen paravirt console device, then we'd need to invent a new
> > <target type='xxx'/> value for Arm.
> 
> It is just the traditional Xen paravirt console.

I tried the above,which AIUI should work, but it fails with the same
"cannot find character device <null>" error. I'll investigate properly
next week.

Ian.