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Hi Anshul,

Xen does support unmodified OS on arm. It is available in the upstream xen. It is not a separate project.

Srujan

anshul makkar <anshulmakkar@gmail.com> wrote:



Hi,
Sorry for my ignorance here, but thus Xen port of ARM (PV) (Cortex A9 without hardware virtualization) supports running unmodified Android as guest or guest needs to be necessarily patched to be able to run.

I know paravirtualization does mean that guest needs to be modified, but I am just confused as I remember I read somewhere that Xen also supports full virtualization. But not sure whether that has been ported on ARM.
--
Thanks
Anshul Makkar
www.justkernel.com<http://www.justkernel.com>
<http://www.linkedin.com/just-kernel>http://www.linkedin.com/groups/Just-Kernel-3033180

Hi srujan, thanks for the reply.
So it means Xen provides full virtualization support as well.

Thanks
Anshul make
On 1 Oct 2013 20:49, "Kotikela, Srujan" <SrujanKotikela@my.unt.edu> wrote:

Hi Anshul,

Xen does support unmodified OS on arm. It is available in the upstream
xen. It is not a separate project.

Srujan

anshul makkar <anshulmakkar@gmail.com> wrote:


Hi,
Sorry for my ignorance here, but thus Xen port of ARM (PV) (Cortex A9
without hardware virtualization) supports running unmodified Android as
guest or guest needs to be necessarily patched to be able to run.

I know paravirtualization does mean that guest needs to be modified, but I
am just confused as I remember I read somewhere that Xen also supports full
virtualization. But not sure whether that has been ported on ARM.
--
Thanks
Anshul Makkar
www.justkernel.com
<http://www.linkedin.com/just-kernel>
http://www.linkedin.com/groups/Just-Kernel-3033180

Anshul,
if you would like to know more about the Xen on ARM with virtualization
extensions project, give a look at:

http://www.xenproject.org/help/presentations-and-videos/video/latest/linaro-connect-introduction-to-xen-on-arm.html

the slides have been used during a Linaro presentation that has been
recorded, the video is available here:

www.youtube.com/watch?v=D0mTOKhAm6Y

Unfortunately the framing is very bad, but the audio might help you
better understand the slides.



On Tue, 1 Oct 2013, anshul makkar wrote:
> Hi srujan,  thanks for the reply.
> So it means Xen provides full virtualization support as well. 
>
> Thanks
> Anshul make
>
> On 1 Oct 2013 20:49, "Kotikela, Srujan" <SrujanKotikela@my.unt.edu> wrote:
>
> Hi Anshul,
>
> Xen does support unmodified OS on arm. It is available in the upstream xen. It is not a separate project.
>
> Srujan
>
> anshul makkar <anshulmakkar@gmail.com> wrote:
>
> Hi,
> Sorry for my ignorance here, but thus Xen port of  ARM (PV) (Cortex A9 without hardware virtualization) supports
> running unmodified Android as guest or guest needs to be necessarily patched to be able to run.
>
> I know paravirtualization does mean that guest needs to be modified, but I am just confused as I remember I read somewhere
> that Xen also supports full virtualization. But not sure whether that has been ported on ARM.
> --
> Thanks
> Anshul Makkar
> www.justkernel.com
> http://www.linkedin.com/groups/Just-Kernel-3033180
>
>
>

K. Thanks Stefano. Let me go through the videos. May be I will get my
answers.
On 1 Oct 2013 23:30, "Stefano Stabellini" <stefano.stabellini@eu.citrix.com>
wrote:

> Anshul,
> if you would like to know more about the Xen on ARM with virtualization
> extensions project, give a look at:
>
>
> http://www.xenproject.org/help/presentations-and-videos/video/latest/linaro-connect-introduction-to-xen-on-arm.html
>
> the slides have been used during a Linaro presentation that has been
> recorded, the video is available here:
>
> www.youtube.com/watch?v=D0mTOKhAm6Y
>
> Unfortunately the framing is very bad, but the audio might help you
> better understand the slides.
>
>
>
> On Tue, 1 Oct 2013, anshul makkar wrote:
> > Hi srujan, thanks for the reply.
> > So it means Xen provides full virtualization support as well.
> >
> > Thanks
> > Anshul make
> >
> > On 1 Oct 2013 20:49, "Kotikela, Srujan" <SrujanKotikela@my.unt.edu>
> wrote:
> >
> > Hi Anshul,
> >
> > Xen does support unmodified OS on arm. It is available in the upstream
> xen. It is not a separate project.
> >
> > Srujan
> >
> > anshul makkar <anshulmakkar@gmail.com> wrote:
> >
> > Hi,
> > Sorry for my ignorance here, but thus Xen port of ARM (PV)
> (Cortex A9 without hardware virtualization) supports
> > running unmodified Android as guest or guest needs to be
> necessarily patched to be able to run.
> >
> > I know paravirtualization does mean that guest needs to be modified, but
> I am just confused as I remember I read somewhere
> > that Xen also supports full virtualization. But not sure whether that
> has been ported on ARM.
> > --
> > Thanks
> > Anshul Makkar
> > www.justkernel.com
> > http://www.linkedin.com/groups/Just-Kernel-3033180
> >
> >
> >

On Tue, 2013-10-01 at 23:25 +0530, anshul makkar wrote:
> So it means Xen provides full virtualization support as well.

Unfortunately it does not.

The Xen port to ARM processors with virtualisation extensions[1] uses a
hybrid model which makes use of both hardware features and
paravirtualisation, it is not the same as either x86 PV or x86 HVM but
is somewhere in the middle, something like the in-progress x86 PVH mode.

So it does not support full virtualisation in the sense of providing an
environment to a guest which mimics a real hardware platform with
emulated devices etc. The guest hardware platform is a mixture of
hardware virtualisation features (e.g. timers, interrupt controller, two
stage paging) and software virtualisation (e.g. event channels and PV
I/O devices).

Ian.

[1] http://wiki.xen.org/wiki/Xen_ARM_with_Virtualization_Extensions
>
> Thanks
> Anshul make
>
> On 1 Oct 2013 20:49, "Kotikela, Srujan" <SrujanKotikela@my.unt.edu>
> wrote:
> Hi Anshul,
>
> Xen does support unmodified OS on arm. It is available in the upstream xen. It is not a separate project.
>
> Srujan
>
> anshul makkar <anshulmakkar@gmail.com> wrote:
>
> Hi,
> Sorry for my ignorance here, but thus Xen port of ARM (PV)
> (Cortex A9 without hardware virtualization) supports running
> unmodified Android as guest or guest needs to be necessarily
> patched to be able to run.
>
>
> I know paravirtualization does mean that guest needs to be
> modified, but I am just confused as I remember I read
> somewhere that Xen also supports full virtualization. But not
> sure whether that has been ported on ARM.
> --
> Thanks
> Anshul Makkar
> www.justkernel.com
> http://www.linkedin.com/groups/Just-Kernel-3033180
>
> _______________________________________________
> Xen-arm mailing list
> Xen-arm@lists.xen.org
> http://lists.xen.org/cgi-bin/mailman/listinfo/xen-arm



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