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Re: [Xen-devel] RT Xen on ARM - R-Car series



(CC Xen-devel)

On 31/01/2019 05:50, LOPEZ, FUENTES NACARINO Jairo Eduardo wrote:
Hello Julien,


Hi,

2019年1月30日(水) 21:12、Julien Grall さん(julien.grall@xxxxxxx <mailto:julien.grall@xxxxxxx>)のメッセージ:

    Hi,

    On 30/01/2019 20:23, LOPEZ, FUENTES NACARINO Jairo Eduardo wrote:

    My e-mail client thinks the e-mail was sent from the future. Can you make 
sure
    your timezone is set correctly?


Very sorry about the timezone issue. We did have an NTP problem. Hopefully things should be ok now.


     > [    0.682996] CPU features: detected feature: Kernel page table
    isolation (KPTI)
     >
     > (XEN) p2m.c:1844: d0v1: Failed to walk page-table va 0xffff800013f59c57
     > (XEN) p2m.c:1844: d0v2: Failed to walk page-table va 0xffff800013f70c57
     > (XEN) p2m.c:1844: d0v1: Failed to walk page-table va 0xffff800013f59c48
     > (XEN) p2m.c:1844: d0v2: Failed to walk page-table va 0xffff800013f70c48
     >
     > </ this continues infinitely>
     >
     > Is this normal. Could the error have anything to do with me using the
     > dom0_max_vpcus=4 bootarg for Xen?

    No this is a unknown benign issue when using KPTI kernel on Xen (see [1]). I
    still haven't found time to fix it and would appreciate help to solve the 
issue.


I had a lot of issues getting the R-Car M3 running as a user and only got it working with Andrii's instructions. I am personally not that familiar with the internal functionality of KPTI or Xen.

Don't worry, it was more an open question as many people seems to hit the issues but no-one have found time so far.

Regarding running Xen on R-Car M3, would you mind to update/add the instructions on the wiki?


If you have any tests you would want to do on my current configuration I will gladly give it a go.

Thank you for the offer. I will let you know when I managed to reach that in my list.

Best regards,

--
Julien Grall

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