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Re: [Xen-devel] Problems when creating domU on OMAP5

On 09/16/2013 02:18 PM, Chen Baozi wrote:
Hi all,

I tried to create a domU on OMAP5 today. But it seems there are still some
problems to solve before I can successfully creat it.

I first cloned Julien's arndale-domU-3.9 branch which mentioned in wiki.
Then I modified gic addresses xenvm-4.2.dts to meet OMAP5432 requirement:

--- a/arch/arm/boot/dts/xenvm-4.2.dts
+++ b/arch/arm/boot/dts/xenvm-4.2.dts
@@ -49,13 +49,13 @@
                 reg = <0 0x80000000 0 0x08000000>;

-       gic: interrupt-controller@2c001000 {
+       gic: interrupt-controller@48211000 {
                 compatible = "arm,cortex-a15-gic", "arm,cortex-a9-gic";
                 #interrupt-cells = <3>;
                 #address-cells = <0>;
-               reg = <0 0x10481000 0 0x1000>,
-                     <0 0x10482000 0 0x100>;
+               reg = <0 0x48211000 0 0x1000>,
+                     <0 0x48212000 0 0x1000>;

         timer {

And make the kernel image as wiki said:

$ cat arch/arm/boot/zImage arch/arm/boot/xenvm-4.2.dtb > image

Write a config file used by xl like:

kernel = "/root/domU/image"
memory = "128"
name = "domU"
vcpus = 1
disk = [ 'phy:/dev/loop0,xvda,w' ]

Setup loop device:

$ losetup /dev/loop0 /root/domU/xen-arm.img

which xen-arm.img is the a bootable rootfs.

Finally I execute xl to create the domU:

$ sudo xl create -f config -d
Can you to copy the output in pastebin of the following command?
xl -vvv create -f config -d

Parsing config from config
unable to format domain config as JSON (YAJL:1)
[   80.685264] Failed to unmap pfn:9bce5 rc:-2
[   80.691741] Failed to unmap pfn:9e7da rc:-2
[   80.696310] Failed to unmap pfn:9bce5 rc:-2
[   80.702494] Failed to unmap pfn:9ba57 rc:-2
[   80.706932] Failed to unmap pfn:9bce3 rc:-2
[   80.718394] Failed to unmap pfn:9bce2 rc:-2

Xen is unable to unmap some pages from the dom0 memory because the page owner is the guest. You will be able to boot but the memory will be lost for ever.

libxl: error: libxl_device.c:894:device_backend_callback: unable to add device 
with path /local/domain/0/backend/vbd/1/51712
libxl: error: libxl_create.c:932:domcreate_launch_dm: unable to add disk devices
libxl: error: libxl_device.c:894:device_backend_callback: unable to remove 
device with path /local/domain/0/backend/vbd/1/51712
libxl: error: libxl.c:1451:devices_destroy_cb: libxl__devices_destroy failed 
for 1
(XEN) mm.c:1092:d0 gnttab_mark_dirty not implemented yet

the gnttab_mark_dirty is only a warning. Nothing bad should happen.

Julien Grall

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