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Re: [Xen-devel] How to dump vcpu regs when a domain is killed during xl create

On 19 August 2014 14:31, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
> On 19/08/14 06:11, manish jaggi wrote:
>> Adding the question on xen-devel
>> On 18 August 2014 14:08, manish jaggi <manishjaggi.oss@xxxxxxxxx> wrote:
>>> I tried to start a domain using xl create, which showed some xen logs
>>> and then hanged for a minute or so and then displayed a messgae
>>> killed. Below is the log
>>> linux:~ # xl create domU.cfg
>>> Parsing config from domU.cfg
>>> (XEN)  ....
>>> Killed
>>> Is there a way to know why it was killed and dump core regs (vcpu
>>> regs) at the point it was killed.
> There is no guarantee the domain has successfully started.
> Put "loglvl=all guest_loglvl=all" on the Xen command line, reboot, and
> attach the results of
> xl -vvvv create domU.cfg
> and xl dmesg after the domain has failed in this way.
> ~Andrew

Below is the log
linux:~ # xl -vvv create domU.cfg -d -p
Parsing config from domU.cfg
    "domid": null,
    "config": {
        "c_info": {
            "type": "pv",
            "name": "guest",
            "uuid": "e5cb14f1-085d-4511-bca5-d6e3a0c35672",
            "run_hotplug_scripts": "True"
        "b_info": {
            "max_vcpus": 1,
            "avail_vcpus": [
            "max_memkb": 262144,
            "target_memkb": 262144,
            "shadow_memkb": 3072,
            "sched_params": {

            "claim_mode": "True",
            "type.pv": {
                "kernel": "/root/Image",
                "cmdline": "console=hvc0 root=/dev/xvda ro"
        "disks": [
                "pdev_path": "/dev/loop0",
                "vdev": "xvda",
                "format": "raw",
                "readwrite": 1
        "on_reboot": "restart"

libxl: verbose:
libxl_create.c:134:libxl__domain_build_info_setdefault: qemu-xen is
unavailable, use qemu-xen-traditional instead: No such file or
libxl: debug: libxl_create.c:1401:do_domain_create: ao 0xd297c20:
create: how=(nil) callback=(nil) poller=0xd293d90
libxl: debug: libxl_device.c:251:libxl__device_disk_set_backend: Disk
vdev=xvda spec.backend=unknown
libxl: debug: libxl_device.c:280:libxl__device_disk_set_backend: Disk
vdev=xvda, using backend phy
libxl: debug: libxl_create.c:851:initiate_domain_create: running bootloader
libxl: debug: libxl_bootloader.c:329:libxl__bootloader_run: no
bootloader configured, using user supplied kernel
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch
w=0xd294648: deregister unregistered
domainbuilder: detail: xc_dom_allocate: cmdline="console=hvc0
root=/dev/xvda ro", features="(null)"
libxl: debug: libxl_dom.c:410:libxl__build_pv: pv kernel mapped 0 path
domainbuilder: detail: xc_dom_kernel_file: filename="/root/Image"
domainbuilder: detail: xc_dom_malloc_filemap    : 8354 kB
domainbuilder: detail: xc_dom_boot_xen_init: ver 4.5, caps
xen-3.0-aarch64 xen-3.0-armv7l
domainbuilder: detail: xc_dom_rambase_init: RAM starts at 40000
domainbuilder: detail: xc_dom_parse_image: called
domainbuilder: detail: xc_dom_find_loader: trying multiboot-binary loader ...
domainbuilder: detail: loader probe failed
domainbuilder: detail: xc_dom_find_loader: trying Linux zImage (ARM64)
loader ...
domainbuilder: detail: loader probe OK
domainbuilder: detail: xc_dom_parse_zimage64_kernel: called
domainbuilder: detail: xc_dom_parse_zimage64_kernel: xen-3.0-aarch64:
0x40080000 -> 0x408a8b50
libxl: debug: libxl_arm.c:474:libxl__arch_domain_init_hw_description:
constructing DTB for Xen version 4.5 guest
libxl: debug: libxl_arm.c:291:make_memory_nodes: Creating placeholder
node /memory@40000000
libxl: debug: libxl_arm.c:291:make_memory_nodes: Creating placeholder
node /memory@200000000
libxl: debug: libxl_arm.c:539:libxl__arch_domain_init_hw_description:
fdt total size 1218
domainbuilder: detail: xc_dom_devicetree_mem: called
domainbuilder: detail: xc_dom_mem_init: mem 256 MB, pages 0x10000 pages, 4k each
domainbuilder: detail: xc_dom_mem_init: 0x10000 pages
domainbuilder: detail: xc_dom_boot_mem_init: called
domainbuilder: detail: set_mode: guest xen-3.0-aarch64, address size 6
domainbuilder: detail: xc_dom_malloc            : 512 kB
domainbuilder: detail: populate_guest_memory: populating RAM @
0000000040000000-0000000050000000 (256MB)
domainbuilder: detail: populate_one_size: populated 0x80/0x80 entries
with shift 9
domainbuilder: detail: arch_setup_meminit: placing boot modules at 0x48000000
domainbuilder: detail: arch_setup_meminit: devicetree: 0x48000000 -> 0x48001000
libxl: debug: libxl_arm.c:570:finalise_one_memory_node: Populating
placeholder node /memory@40000000
libxl: debug: libxl_arm.c:564:finalise_one_memory_node: Nopping out
placeholder node /memory@200000000
domainbuilder: detail: xc_dom_build_image: called
domainbuilder: detail: xc_dom_alloc_segment:   kernel       :
0x40080000 -> 0x408a9000  (pfn 0x40080 + 0x829 pages)

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