Re: [Xen-devel] XEN on R-CAR H3

[Oleksandr <olekstysh@xxxxxxxxx>]

On 21.02.19 12:11, Julien Grall wrote:
> Hi Oleksandr,
Hi, Julien, Amit


> On 20/02/2019 21:28, Oleksandr Tyshchenko wrote:
> > ср, 20 февр. 2019 г., 22:14 Julien Grall <julien.grall@xxxxxxx
> > <mailto:julien.grall@xxxxxxx>>:
> > If I am not mistaken, the diff between BSP's and mainline device trees is in
> > reserved memory area. BSP device tree (1) contains reserved memory regions, but
> > the mainline one (2) doesn't.
> >   From the log you provided, I see that Xen is trying to copy device-tree to the
> > address which is located in reserved area (0x58000000). FYI, we always remove
> > these reserved area nodes from the device-tree. Maybe that's why we didn't face
> > an issue. Julien, what do you think, can this be a reason?
> While I know that Xen does not deal with reserved area yet, we should have been
> able to write in that region. We don't even reach that state as we can't get the
> associated page.
>
> It might be possible that the p2m entry is overwritten when going through the DT
> for mapping all the regions (see handle_device).
Make sense.


I have just made an experiment. I returned reserved nodes back in my 
setup and got an fault, similar to what Amit had faced.

(XEN) handle /memory@48000000
(XEN)   Skip it (matched)
(XEN) handle /reserved-memory
(XEN) dt_irq_number: dev=/reserved-memory
(XEN) /reserved-memory passthrough = 1 nirq = 0 naddr = 0
(XEN) handle /reserved-memory/linux,lossy_decompress
(XEN) dt_irq_number: dev=/reserved-memory/linux,lossy_decompress
(XEN) /reserved-memory/linux,lossy_decompress passthrough = 1 nirq = 0 
naddr = 1
(XEN) DT: ** translation for device 
/reserved-memory/linux,lossy_decompress **
(XEN) DT: bus is default (na=2, ns=2) on /reserved-memory
(XEN) DT: translating address:<3> 00000000<3> 54000000<3>
(XEN) DT: parent bus is default (na=2, ns=2) on /
(XEN) DT: empty ranges; 1:1 translation
(XEN) DT: parent translation for:<3> 00000000<3> 00000000<3>
(XEN) DT: with offset: 54000000
(XEN) DT: one level translation:<3> 00000000<3> 54000000<3>
(XEN) DT: reached root node
(XEN)   - MMIO: 0054000000 - 0057000000 P2MType=5
(XEN) handle /reserved-memory/linux,adsp
(XEN) dt_irq_number: dev=/reserved-memory/linux,adsp
(XEN) /reserved-memory/linux,adsp passthrough = 1 nirq = 0 naddr = 1
(XEN) DT: ** translation for device /reserved-memory/linux,adsp **
(XEN) DT: bus is default (na=2, ns=2) on /reserved-memory
(XEN) DT: translating address:<3> 00000000<3> 57000000<3>
(XEN) DT: parent bus is default (na=2, ns=2) on /
(XEN) DT: empty ranges; 1:1 translation
(XEN) DT: parent translation for:<3> 00000000<3> 00000000<3>
(XEN) DT: with offset: 57000000
(XEN) DT: one level translation:<3> 00000000<3> 57000000<3>
(XEN) DT: reached root node
(XEN)   - MMIO: 0057000000 - 0058000000 P2MType=5
(XEN) handle /reserved-memory/linux,cma
(XEN) dt_irq_number: dev=/reserved-memory/linux,cma
(XEN) /reserved-memory/linux,cma passthrough = 1 nirq = 0 naddr = 1
(XEN) DT: ** translation for device /reserved-memory/linux,cma **
(XEN) DT: bus is default (na=2, ns=2) on /reserved-memory
(XEN) DT: translating address:<3> 00000000<3> 58000000<3>
(XEN) DT: parent bus is default (na=2, ns=2) on /
(XEN) DT: empty ranges; 1:1 translation
(XEN) DT: parent translation for:<3> 00000000<3> 00000000<3>
(XEN) DT: with offset: 58000000
(XEN) DT: one level translation:<3> 00000000<3> 58000000<3>
(XEN) DT: reached root node
*(XEN)   - MMIO: 0058000000 - 0070000000 P2MType=5*
(XEN) handle /reserved-memory/linux,multimedia
(XEN) dt_irq_number: dev=/reserved-memory/linux,multimedia
(XEN) /reserved-memory/linux,multimedia passthrough = 1 nirq = 0 naddr = 1
(XEN) DT: ** translation for device /reserved-memory/linux,multimedia **
(XEN) DT: bus is default (na=2, ns=2) on /reserved-memory
(XEN) DT: translating address:<3> 00000000<3> 70000000<3>
(XEN) DT: parent bus is default (na=2, ns=2) on /
(XEN) DT: empty ranges; 1:1 translation
(XEN) DT: parent translation for:<3> 00000000<3> 00000000<3>
(XEN) DT: with offset: 70000000
(XEN) DT: one level translation:<3> 00000000<3> 70000000<3>
(XEN) DT: reached root node
(XEN)   - MMIO: 0070000000 - 0080000000 P2MType=5
(XEN) handle /mmngr
(XEN) dt_irq_number: dev=/mmngr
(XEN) /mmngr passthrough = 1 nirq = 0 naddr = 0
(XEN) handle /mmngrbuf
(XEN) dt_irq_number: dev=/mmngrbuf
(XEN) /mmngrbuf passthrough = 1 nirq = 0 naddr = 0
(XEN) handle /vspm_if
(XEN) dt_irq_number: dev=/vspm_if
(XEN) /vspm_if passthrough = 1 nirq = 0 naddr = 0
(XEN) Allocating PPI 16 for event channel interrupt
(XEN) Create hypervisor node
(XEN) Create PSCI node
(XEN) Create cpus node
(XEN) Create cpu@0 (logical CPUID: 0) node
(XEN) Create cpu@1 (logical CPUID: 1) node
(XEN) Create cpu@2 (logical CPUID: 2) node
(XEN) Create cpu@3 (logical CPUID: 3) node
(XEN) Create memory node (reg size 4, nr cells 4)
(XEN)   Bank 0: 0x60000000->0x70000000
*(XEN) Loading zImage from 000000007a000000 to 
0000000060080000-0000000062080000*
(XEN)
(XEN) ****************************************
(XEN) Panic on CPU 0:
(XEN) Unable to copy the kernel in the hwdom memory
(XEN) ****************************************
(XEN)
(XEN) Reboot in five seconds...


> Printing the lookup would actually help to know what's going on.
>
> Cheers,
--
Regards,

Oleksandr Tyshchenko


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