* [U-Boot] ARMv8: Use U-Boot to boot Xen?
@ 2016-01-28 19:06 Dirk Behme
2016-01-29 0:29 ` Simon Glass
2016-01-29 4:04 ` Peng Fan
0 siblings, 2 replies; 6+ messages in thread
From: Dirk Behme @ 2016-01-28 19:06 UTC (permalink / raw)
To: u-boot
Hi,
are there any U-Boot examples/patches to boot Xen on an ARMv8/aarch64
system?
I've found
http://lists.denx.de/pipermail/u-boot/2015-October/230077.html
what might be helpful.
But maybe I missed anything else?
Many thanks
Dirk
^ permalink raw reply [flat|nested] 6+ messages in thread
* [U-Boot] ARMv8: Use U-Boot to boot Xen?
2016-01-28 19:06 [U-Boot] ARMv8: Use U-Boot to boot Xen? Dirk Behme
@ 2016-01-29 0:29 ` Simon Glass
2016-01-29 4:04 ` Peng Fan
1 sibling, 0 replies; 6+ messages in thread
From: Simon Glass @ 2016-01-29 0:29 UTC (permalink / raw)
To: u-boot
Hi Dirk,
On 28 January 2016 at 12:06, Dirk Behme <dirk.behme@gmail.com> wrote:
>
> Hi,
>
> are there any U-Boot examples/patches to boot Xen on an ARMv8/aarch64 system?
>
> I've found
>
> http://lists.denx.de/pipermail/u-boot/2015-October/230077.html
>
> what might be helpful.
>
> But maybe I missed anything else?
I'm aware of these:
http://lists.denx.de/pipermail/u-boot/2015-April/211789.html
http://events.linuxfoundation.org/sites/events/files/slides/U-Boot%20FIT%20for%20Xen.pdf
>
> Many thanks
>
> Dirk
> _______________________________________________
> U-Boot mailing list
> U-Boot at lists.denx.de
> http://lists.denx.de/mailman/listinfo/u-boot
Regards,
Simon
^ permalink raw reply [flat|nested] 6+ messages in thread
* [U-Boot] ARMv8: Use U-Boot to boot Xen?
2016-01-28 19:06 [U-Boot] ARMv8: Use U-Boot to boot Xen? Dirk Behme
2016-01-29 0:29 ` Simon Glass
@ 2016-01-29 4:04 ` Peng Fan
2016-01-29 9:18 ` Ian Campbell
1 sibling, 1 reply; 6+ messages in thread
From: Peng Fan @ 2016-01-29 4:04 UTC (permalink / raw)
To: u-boot
Hi Dirk,
Cc Ian xen experts.
On Thu, Jan 28, 2016 at 08:06:30PM +0100, Dirk Behme wrote:
>Hi,
>
>are there any U-Boot examples/patches to boot Xen on an ARMv8/aarch64 system?
>
>I've found
>
>http://lists.denx.de/pipermail/u-boot/2015-October/230077.html
>
>what might be helpful.
>
>But maybe I missed anything else?
I guess you are asking steps how to boot xen using uboot?
You may need to take this:
http://wiki.xen.org/wiki/Xen_ARM_with_Virtualization_Extensions
Regards,
Peng.
>
>Many thanks
>
>Dirk
>_______________________________________________
>U-Boot mailing list
>U-Boot at lists.denx.de
>http://lists.denx.de/mailman/listinfo/u-boot
^ permalink raw reply [flat|nested] 6+ messages in thread
* [U-Boot] ARMv8: Use U-Boot to boot Xen?
2016-01-29 4:04 ` Peng Fan
@ 2016-01-29 9:18 ` Ian Campbell
2016-01-29 15:54 ` Dirk Behme
0 siblings, 1 reply; 6+ messages in thread
From: Ian Campbell @ 2016-01-29 9:18 UTC (permalink / raw)
To: u-boot
On Fri, 2016-01-29 at 12:04 +0800, Peng Fan wrote:
> Hi Dirk,
>
> Cc Ian xen experts.
>
> On Thu, Jan 28, 2016 at 08:06:30PM +0100, Dirk Behme wrote:
> > Hi,
> >
> > are there any U-Boot examples/patches to boot Xen on an ARMv8/aarch64
> > system?
> >
> > I've found
> >
> > http://lists.denx.de/pipermail/u-boot/2015-October/230077.html
> >
> > what might be helpful.
> >
> > But maybe I missed anything else?
>
> I guess you are asking steps how to boot xen using uboot?
>
> You may need to take this:
> http://wiki.xen.org/wiki/Xen_ARM_with_Virtualization_Extensions
Indeed.
In addition one AArch64 system which uses u-boot and which has concrete
instructions is the APM X-Gene/Mustang:
http://wiki.xen.org/wiki/Xen_ARM_with_Virtualization_Extensions/APMXGeneMustang
which would likely be helpful. There are other ARMv7 systems linked from
the main page which would have other examples, but for 32-bit.
Ian.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [U-Boot] ARMv8: Use U-Boot to boot Xen?
2016-01-29 9:18 ` Ian Campbell
@ 2016-01-29 15:54 ` Dirk Behme
2016-01-29 16:23 ` Ian Campbell
0 siblings, 1 reply; 6+ messages in thread
From: Dirk Behme @ 2016-01-29 15:54 UTC (permalink / raw)
To: u-boot
On 29.01.2016 10:18, Ian Campbell wrote:
> On Fri, 2016-01-29 at 12:04 +0800, Peng Fan wrote:
>> Hi Dirk,
>>
>> Cc Ian xen experts.
>>
>> On Thu, Jan 28, 2016 at 08:06:30PM +0100, Dirk Behme wrote:
>>> Hi,
>>>
>>> are there any U-Boot examples/patches to boot Xen on an ARMv8/aarch64
>>> system?
>>>
>>> I've found
>>>
>>> http://lists.denx.de/pipermail/u-boot/2015-October/230077.html
>>>
>>> what might be helpful.
>>>
>>> But maybe I missed anything else?
>>
>> I guess you are asking steps how to boot xen using uboot?
>>
>> You may need to take this:
>> http://wiki.xen.org/wiki/Xen_ARM_with_Virtualization_Extensions
>
> Indeed.
>
> In addition one AArch64 system which uses u-boot and which has concrete
> instructions is the APM X-Gene/Mustang:
> http://wiki.xen.org/wiki/Xen_ARM_with_Virtualization_Extensions/APMXGeneMustang
> which would likely be helpful.
Yes, that page is very helpful, thanks!
But I think it misses one information, or most probably the
configuration on that board is different. Above page just do a 'run
xen_run' which in the end does the necessary tftp loading and finally
the bootm to start Xen.
So I'd assume that on that board U-Boot runs at EL3 or EL2 (?).
In my environment, U-Boot runs at EL1. I.e. after loading Xen by tftp
I somehow need to switch to EL2 to be able to start Xen.
And this is what I think I miss. How to switch from U-Boot running at
EL1 to hypervisor mode EL2? Therefore I'd think that
http://lists.denx.de/pipermail/u-boot/2015-October/230077.html
might be helpful.
Best regards
Dirk
^ permalink raw reply [flat|nested] 6+ messages in thread
* [U-Boot] ARMv8: Use U-Boot to boot Xen?
2016-01-29 15:54 ` Dirk Behme
@ 2016-01-29 16:23 ` Ian Campbell
0 siblings, 0 replies; 6+ messages in thread
From: Ian Campbell @ 2016-01-29 16:23 UTC (permalink / raw)
To: u-boot
On Fri, 2016-01-29 at 16:54 +0100, Dirk Behme wrote:
> On 29.01.2016 10:18, Ian Campbell wrote:
> > On Fri, 2016-01-29 at 12:04 +0800, Peng Fan wrote:
> > > Hi Dirk,
> > >
> > > Cc Ian xen experts.
> > >
> > > On Thu, Jan 28, 2016 at 08:06:30PM +0100, Dirk Behme wrote:
> > > > Hi,
> > > >
> > > > are there any U-Boot examples/patches to boot Xen on an
> > > > ARMv8/aarch64
> > > > system?
> > > >
> > > > I've found
> > > >
> > > > http://lists.denx.de/pipermail/u-boot/2015-October/230077.html
> > > >
> > > > what might be helpful.
> > > >
> > > > But maybe I missed anything else?
> > >
> > > I guess you are asking steps how to boot xen using uboot?
> > >
> > > You may need to take this:
> > > http://wiki.xen.org/wiki/Xen_ARM_with_Virtualization_Extensions
> >
> > Indeed.
> >
> > In addition one AArch64 system which uses u-boot and which has concrete
> > instructions is the APM X-Gene/Mustang:
> > ?????http://wiki.xen.org/wiki/Xen_ARM_with_Virtualization_Extensions/AP
> > MXGeneMustang
> > which would likely be helpful.
>
>
> Yes, that page is very helpful, thanks!
>
> But I think it misses one information, or most probably the
> configuration on that board is different. Above page just do a 'run
> xen_run' which in the end does the necessary tftp loading and finally
> the bootm to start Xen.
>
> So I'd assume that on that board U-Boot runs at EL3 or EL2 (?).
>
> In my environment, U-Boot runs at EL1. I.e. after loading Xen by tftp
> I somehow need to switch to EL2 to be able to start Xen.
Once you are in EL1 you cannot get back to EL2 (or EL3) without support
from a lower level firmware running in those exception levels. If you have
no such underlying firmware then you should arrange for u-boot to run at
EL3.
>
> And this is what I think I miss. How to switch from U-Boot running at
> EL1 to hypervisor mode EL2? Therefore I'd think that
>
> http://lists.denx.de/pipermail/u-boot/2015-October/230077.html
You need to arrange for U-boot to run in EL3 and enter the "kernel" (Xen in
this case) in NS EL2. This likely means implementing the PSCI interface for
the kernel to use to manage CPUs.
If you were running on a 32-bit system I would direct you towards the
CONFIG_ARMV7_PSCI, CONFIG_ARMV7_NONSEC and ARMV7_VIRT u-boot options (which
in turn would require your platform code to provide some support). I'm not
sure what the equivalent for 64-bit is, sorry.
The link you post is, AFAICT, about the other end i.e. allowing u-boot to
talk to an existing secure world firmware beneath it.
Ian.
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2016-01-29 16:23 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-01-28 19:06 [U-Boot] ARMv8: Use U-Boot to boot Xen? Dirk Behme
2016-01-29 0:29 ` Simon Glass
2016-01-29 4:04 ` Peng Fan
2016-01-29 9:18 ` Ian Campbell
2016-01-29 15:54 ` Dirk Behme
2016-01-29 16:23 ` Ian Campbell
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