Re: xl create failure on arm64 with XEN 4.9rc6

[Julien Grall <julien.grall@arm.com>]

(CC toolstack maintainers)

On 25/05/2017 19:58, Feng Kan wrote:
> Hi All:

Hello,

> This is not specifically against the XEN 4.9. I am using 4.12rc2
> kernel on arm64 platform. Started dom0 fine with ACPI enabled, but
> failed when creating the domU guest. Xen is built natively on the
> arm64 platform. Using the same kernel and ramdisk as dom0. Any idea as
> why it is stuck here
> would be greatly appreciated?

The first step would to try a stable release if you can. Also, it would 
be useful if you provide information about the guest (i.e the 
configuration) and your .config for the kernel.

I gave a try on Linux 4.12rc2 and I was not able to reproduce your error.

>
> xc: error: panic: xc_dom_boot.c:178: xc_dom_boot_domU_map: failed to
> mmap domU pages 0x450c2+0x2f3d [mmap, errno=22 (Invalid ar
> gument), chunksize 0x1000]: Internal error
> libxl: error: libxl_dom.c:679:libxl__build_dom: xc_dom_build_image
> failed: Invalid argument
> domainbuilder: detail: xc_dom_release: called
> libxl: error: libxl_create.c:1217:domcreate_rebuild_done: Domain
> 1:cannot (re-)build domain: -3
> libxl: debug: libxl_domain.c:1140:devices_destroy_cb: Domain 1:Forked
> pid 2477 for destroy of domain
> libxl: debug: libxl_create.c:1646:do_domain_create: Domain 0:ao
> 0x1ae10cb0: inprogress: poller=0x1ae10d40, flags=i
> libxl: debug: libxl_event.c:1869:libxl__ao_complete: ao 0x1ae10cb0:
> complete, rc=-3
> libxl: debug: libxl_event.c:1838:libxl__ao__destroy: ao 0x1ae10cb0: destroy
> libxl: debug: libxl_domain.c:871:libxl_domain_destroy: Domain 1:ao
> 0x1ae10cb0: create: how=(nil) callback=(nil) poller=0x1ae10d
> 40
>
> Seem to failed when mmapping pages for the ramdisk. I did some digging
> and the failure
> occurs during the  IOCTL_PRIVCMD_MMAPBATCH_V2 call. It seems the
> 8192's page had a err code of -22.

-22 is -EINVAL. There are quite a few path return -EINVAL, did you try 
to narrow the failure in the kernel?

  The system have plenty of memory.
> Afterward, a null guest is created.
> As a side note, how do I get rid of it?

Normally the domain should be destroyed by the tools if the building failed.

You should be able to destroy it using 'xl domain domid' where domid is 
the domain ID of the domain. If it does not work, then it means dom0 is 
holding reference on some page belonging to that domain.

Cheers,

-- 
Julien Grall

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