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


  • To: xen-users@xxxxxxxxxxxxxxxxxxxx, Julien Grall <julien.grall@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Iain Hunter <drhunter95@xxxxxxxxx>, Hunyue Yau <hy-gsoc@xxxxxxxxxxxxxxx>
  • From: Denis Obrezkov <denisobrezkov@xxxxxxxxx>
  • Date: Mon, 10 Jun 2019 19:51:32 +0200
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  • Delivery-date: Mon, 10 Jun 2019 17:52:55 +0000
  • List-id: Xen user discussion <xen-users.lists.xenproject.org>
  • Openpgp: preference=signencrypt

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:
(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'

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>

fdt mknod /chosen/domU1 module@0
fdt set /chosen/domU1/module@0 compatible "multiboot,kernel"
"multiboot,module"
fdt set /chosen/domU1/module@0 reg <0x43000000 0x7cc561>
fdt set /chosen/domU1/module@0 bootargs "rw root=/dev/ram
rdinit=/sbin/init console=hvc0 earlycon=xenboot"

fdt mknod /chosen/domU1 module@1
fdt set /chosen/domU1/module@1 compatible "multiboot,ramdisk"
"multiboot,module"
fdt set /chosen/domU1/module@1 reg <0x48000000 0x11b680>

booti 0x49000000 - 0x44000000

On 6/10/19 2:24 PM, Denis Obrezkov wrote:
> I found out that I can get rid of that error if I load the same image to
> another address space with -device loader. But then I get the error:
> (XEN) ***************************************************
> (XEN) PLEASE SPECIFY dom0_mem PARAMETER - USING 512M FOR NOW
> (XEN) ***************************************************
> (XEN) 3... 2... 1...
> (XEN) *** Serial input to DOM0 (type 'CTRL-a' three times to switch input)
> (XEN) *** LOADING DOMU cpus=1 memory=200000KB ***
> (XEN) Loading Domd1 kernel from boot module @ 0000000043000000
> (XEN) Loading ramdisk from boot module @ 0000000042000000
> (XEN)
> (XEN) ****************************************
> (XEN) Panic on CPU 0:
> (XEN) Out of memory
> (XEN) ****************************************
> (XEN)
> (XEN) Reboot in five seconds...
> 
> So, I don't understand how xen distribute the allocated memory and how
> can it be allocated via a device tree.
> 
> On 6/10/19 12:09 PM, Denis Obrezkov wrote:
>> Hello,
>>
>> I  am trying to boot domU from a device tree. I want to use the same
>> ramdisk and kernel image as for dom0. These are my u-boot commands:
>>
>> fdt addr 0x44000000
>> fdt resize
>> fdt set /chosen \#address-cells <1>
>> fdt set /chosen \#size-cells <1>
>> 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 mknod /chosen/domU1 module@0
>> fdt set /chosen/domU1/module@0 compatible "xen,linux-zimage"
>> "xen,multiboot-module"
>> fdt set /chosen/domU1/module@0 reg <0x47000000 0x7cc561>
>> fdt set /chosen/domU1/module@0 bootargs "rw root=/dev/ram
>> rdinit=/sbin/init console=hvc0 earlycon=xenboot"
>>
>> fdt mknod /chosen/domU1 module@1
>> fdt set /chosen/domU1/module@1 compatible "xen,linux-initrd"
>> "xen,multiboot-module"
>> fdt set /chosen/domU1/module@1 reg <0x42000000 0x11b680>
>>
>> booti 0x49000000 - 0x44000000
>>
>> I got: 
>>
>> ....
>>
>> (XEN) *** LOADING DOMAIN 0 ***
>> (XEN) Missing kernel boot module?
>> (XEN)
>> (XEN) ****************************************
>> (XEN) Panic on CPU 0:
>> (XEN) Could not set up DOM0 guest OS
>> (XEN) ****************************************
>> (XEN)
>> (XEN) Reboot in five seconds...
>>
>> I wasn't able to find instructions on how to run domU and dom0 images
>> simultaneously.
>>
> 

-- 
Regards, Denis Obrezkov

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