Re: [Xen-users] How to boot domU and dom0 from a device tree

[Denis Obrezkov <denisobrezkov@xxxxxxxxx>]

I also tried the latest stable linux kernel 5.1.9 and it's the same story.
I also thought that maybe xen just overwrites some values so I put domu
images and dtb to another memory region (>0x90000000) but the problem
still exists. And the same error when I try to boot domu without the
ramdisk.

On 6/11/19 8:20 PM, Denis Obrezkov wrote:
> Ok,
> Linux 4.20.11
> xen 4.12.0
> 
> Their configs are default (defconfig for Linux).
> 
> maybe I should use a newer kernel.
> I will try it soon.
> 
> On 6/11/19 6:09 PM, Stefano Stabellini wrote:
>> Hi Denis,
>>
>> I cannot spot anything wrong looking at the device tree configuration.
>> Could you please provide:
>>
>> - the original device tree
>> - all the binaries, including Xen, Linux, ramdisks
>> - the exact version of Xen and Linux you used
>> - the Xen and Linux kconfig (xen/.config for Xen and .config for Linux)
>> - the QEMU command line (if you are using QEMU)
>>
>> I'll try to repro the issue here.
>>
>>
>> On Tue, 11 Jun 2019, Denis Obrezkov wrote:
>>> Hi,
>>>
>>> I don't think it's the memory issue:
>>>
>>> (XEN) *** Serial input to DOM0 (type 'CTRL-a' three times to switch input)
>>> (XEN) *** LOADING DOMU cpus=1 memory=a00000KB ***
>>> (XEN) Loading Domd1 kernel from boot module @ 0000000043000000
>>> (XEN) Loading ramdisk from boot module @ 0000000048000000
>>> (XEN)
>>> (XEN) ****************************************
>>> (XEN) Panic on CPU 0:
>>> (XEN) Out of memory
>>> (XEN) ****************************************
>>> (XEN)
>>> (XEN) Reboot in five seconds...
>>>
>>> On 6/11/19 2:57 PM, Julien Grall wrote:
>>>> On 10/06/2019 22:24, Denis Obrezkov wrote:
>>>>
>>>> Hi Denis,
>>>>
>>>>> On 6/10/19 10:30 PM, Stefano Stabellini wrote:
>>>>>> On Mon, 10 Jun 2019, Denis Obrezkov wrote:
>>>>>>> Also, I found out how to pass the amount of memory for dom0. And I
>>>>>>> passed 256M. And I can see that in a device tree there is a memory node
>>>>>>> with 4096M allocated. So, I don't understand why I have this error:
>>>>>>
>>>>>> This is easy, the answer is below.
>>>>>>
>>>>>>
>>>>>>> (XEN) *** LOADING DOMAIN 0 ***
>>>>>>> (XEN) Loading Domd0 kernel from boot module @ 0000000047000000
>>>>>>> (XEN) Loading ramdisk from boot module @ 0000000042000000
>>>>>>> (XEN) Allocating 1:1 mappings totalling 256MB for dom0:
>>>>>>> (XEN) BANK[0] 0x00000050000000-0x00000060000000 (256MB)
>>>>>>> (XEN) Grant table range: 0x00000049000000-0x00000049040000
>>>>>>> (XEN) Allocating PPI 16 for event channel interrupt
>>>>>>> (XEN) Loading zImage from 0000000138000000 to
>>>>>>> 0000000050080000-00000000512d1a00
>>>>>>> (XEN) Loading dom0 initrd from 0000000042000000 to
>>>>>>> 0x0000000058200000-0x000000005831b680
>>>>>>> (XEN) Loading dom0 DTB to 0x0000000058000000-0x0000000058001da8
>>>>>>> (XEN) Initial low memory virq threshold set at 0x4000 pages.
>>>>>>> (XEN) Scrubbing Free RAM in background
>>>>>>> (XEN) Std. Loglevel: Errors and warnings
>>>>>>> (XEN) Guest Loglevel: Nothing (Rate-limited: Errors and warnings)
>>>>>>> (XEN) ***************************************************
>>>>>>> (XEN) No support for ARM_SMCCC_ARCH_WORKAROUND_1.
>>>>>>> (XEN) Please update your firmware.
>>>>>>> (XEN) ***************************************************
>>>>>>> (XEN) 3... 2... 1...
>>>>>>> (XEN) *** Serial input to DOM0 (type 'CTRL-a' three times to switch
>>>>>>> input)
>>>>>>> (XEN) *** LOADING DOMU cpus=1 memory=140000KB ***
>>>>>>> (XEN) Loading Domd1 kernel from boot module @ 0000000043000000
>>>>>>> (XEN) Loading ramdisk from boot module @ 0000000048000000
>>>>>>> (XEN)
>>>>>>> (XEN) ****************************************
>>>>>>> (XEN) Panic on CPU 0:
>>>>>>> (XEN) Out of memory
>>>>>>> (XEN) ****************************************
>>>>>>> (XEN)
>>>>>>> (XEN) Reboot in five seconds...
>>>>>>>
>>>>>>> fdt commands passed via u-boot:
>>>>>>>
>>>>>>> setenv xen_bootargs 'dom0_mem=256M'
>>>>>>
>>>>>> You just need to give more memory to dom0. Use dom0_mem=1G or something
>>>>>> like that for a start.
>>>>> But as far as I understand domU doesn't have enough memory and
>>>>> fails.     I
>>>>> change dom0_mem to 1G but the problem still exists.
>>>>
>>>> You are right, the problem is from DomU not Dom0...
>>>>
>>>>>>
>>>>>>
>>>>>>> fdt addr 0x44000000
>>>>>>> fdt resize
>>>>>>> fdt set /chosen \#address-cells <1>
>>>>>>> fdt set /chosen \#size-cells <1>
>>>>>>> fdt set /chosen xen,xen-bootargs \"$xen_bootargs\"
>>>>>>> fdt mknod /chosen module@0
>>>>>>> fdt set /chosen/module@0 compatible "xen,linux-zimage"
>>>>>>> "xen,multiboot-module"
>>>>>>> fdt set /chosen/module@0 reg <0x47000000 0x7cc561>
>>>>>>> fdt set /chosen/module@0 bootargs "rw root=/dev/ram rdinit=/sbin/init
>>>>>>> earlyprintk=serial,ttyAMA0 console=hvc0 earlycon=xenboot"
>>>>>>> fdt mknod /chosen module@1
>>>>>>> fdt set /chosen/module@1 compatible "xen,linux-initrd"
>>>>>>> "xen,multiboot-module"
>>>>>>> fdt set /chosen/module@1 reg <0x42000000 0x11b680>
>>>>>>>
>>>>>>> fdt mknod /chosen domU1
>>>>>>> fdt set /chosen/domU1 compatible "xen,domain"
>>>>>>> fdt set /chosen/domU1 \#address-cells <1>
>>>>>>> fdt set /chosen/domU1 \#size-cells <1>
>>>>>>> fdt set /chosen/domU1 \cpus <1>
>>>>>>> fdt set /chosen/domU1 \memory <0 1310720>
>>>>
>>>> ... this property is used to tell how much memory the guest domU1 has. I
>>>> am a bit surprised that 136MB of RAM is not enough, but you could try to
>>>> bump it to 512MB or even 1GB and see.
>>>>
>>>> Cheers,
>>>>
>>>
>>> -- 
>>> Regards, Denis Obrezkov
>>>
> 

-- 
Regards, Denis Obrezkov

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