Re: [Xen-devel] HVM Driver Domain

[tosher 1 <akm2tosher@xxxxxxxxx>]

Rojer,

> You can also start xl devd manually, as that will give you verbose
> output of whats going on. In the driver domain:

> # killall xl
> # xl -vvv devd -F

> That should give you detailed output of what's going on in the driver
> domain, can you paste the output you get from the driver domain when
> you try to start the failed guest?

I ran both commands in the driver domain. Before starting the domU, I get the 
following verbose.

# sudo xl -vvv devd -F
libxl: debug: libxl_device.c:1733:libxl_device_events_handler: Domain 0:ao 
0x556e3e940ef0: create: how=(nil) callback=(nil) poller=0x556e3e940c10
libxl: debug: libxl_event.c:636:libxl__ev_xswatch_register: watch 
w=0x7ffca33549d8 wpath=/local/domain/0/backend token=3/0: register slotnum=3
libxl: debug: libxl_device.c:1790:libxl_device_events_handler: Domain 0:ao 
0x556e3e940ef0: inprogress: poller=0x556e3e940c10, flags=i
libxl: debug: libxl_event.c:573:watchfd_callback: watch w=0x7ffca33549d8 
wpath=/local/domain/0/backend token=3/0: event epath=/local/domain/0/backend
libxl: debug: libxl_event.c:2227:libxl__nested_ao_create: ao 0x556e3e940600: 
nested ao, parent 0x556e3e940ef0
libxl: debug: libxl_event.c:1838:libxl__ao__destroy: ao 0x556e3e940600: destroy

I know this is not exactly what you asked for. Unfortunately, I don't see any 
other verbose when try to start DomU. The error messages I get from the failed 
DomU launch is as the following, where driver domain id is 7.

libxl: error: libxl_device.c:1075:device_backend_callback: Domain 8:unable to 
add device with path /local/domain/7/backend/vif/8/0
libxl: error: libxl_create.c:1458:domcreate_attach_devices: Domain 8:unable to 
add nic devices
libxl: error: libxl_device.c:1075:device_backend_callback: Domain 8:unable to 
remove device with path /local/domain/7/backend/vif/8/0
libxl: error: libxl_domain.c:1075:devices_destroy_cb: Domain 
8:libxl__devices_destroy failed
libxl: error: libxl_domain.c:1003:libxl__destroy_domid: Domain 8:Non-existant 
domain
libxl: error: libxl_domain.c:962:domain_destroy_callback: Domain 8:Unable to 
destroy guest
libxl: error: libxl_domain.c:889:domain_destroy_cb: Domain 8:Destruction of 
domain failed


On the other hand, if I run devd in Dom0, I get a lot of verbose when I try to 
launch DomU, dependent on Driver Domain for networking. I am not sure if I 
should paste it here. Please let me know what you think.

Thanks,
Mehrab


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