Re: [Xen-users] Starting to port xen on beagleboard-x15 (GSoC 2019 project)

[Oleksandr Tyshchenko <Oleksandr_Tyshchenko@xxxxxxxx>]

Hi Julien.

Again, sorry for the possible format issue an top-posting.

> I am a bit confused. Linux is able to bring-up CPU in hyp mode with the current

> U-boot. Why would we need more changes for Xen?

I have added Andrii, who, I hope, will shed some light on this.

OLEKSANDR TYSHCHENKO

Lead Software Engineer

 

Office: +380 44 390 5457 x 66821   Cell: +380 93 661 6198   Email: oleksandr_tyshchenko@xxxxxxxx

Kyiv, Ukraine (GMT+3)   epam.com

 

CONFIDENTIALITY CAUTION AND DISCLAIMER
This message is intended only for the use of the individual(s) or entity(ies) to which it is addressed and contains information that is legally privileged and confidential. If you are not the intended recipient, or the person responsible for delivering the message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. All unintended recipients are obliged to delete this message and destroy any printed copies.

---

From: Julien Grall <julien.grall@xxxxxxx>
Sent: Tuesday, June 18, 2019 13:40
To: Oleksandr Tyshchenko; Iain Hunter; Denis Obrezkov
Cc: xen-users@xxxxxxxxxxxxxxxxxxxx; Stefano Stabellini; Hunyue Yau; Andre Przywara
Subject: Re: Starting to port xen on beagleboard-x15 (GSoC 2019 project)

 

On 18/06/2019 11:33, Oleksandr Tyshchenko wrote:
> Hello all.

Hi,

> Sorry for the top-posting.
>
>> I have also CCed Oleksandr, who IIRC worked on a platform using the same SoC
>> (DRA7) in the past.
>
> Yes. I worked with DRA7 sometime ago. Unfortunately, I don't remember this
> platform in details, but, there is a Wiki page describing how to run Xen on this
> platform which *may* help:
> https://wiki.xenproject.org/wiki/User:Xen_intruction_setup_for_dra7xx-evm_board
> Please note, it is related to old Xen and TI GLSDK versions.
>
> Regarding secondary CPU boot.
> The special monitor API is used to enable Hyp mode. U-Boot brings secondary CPU
> up, which, it turn, switches to Hyp mode and enters WFE until Xen wakes it up.
> Take a look at the following patch:
> https://github.com/inisider/gl_patches/blob/master/dra7xx-evm/glsdk/0007-Add-virtualization-support-for-dra7xx-evm.patch#L591

I am a bit confused. Linux is able to bring-up CPU in hyp mode with the current
U-boot. Why would we need more changes for Xen?

Cheers,

--
Julien Grall

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-users