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[Xen-devel] [BUG] Qemu crash on xl create with memory allocation error (probably xl not consider all videoram for initial memory check)

On dom0 with xen from git 4.4-stable I found unexpected case about memory check on xl create. If I try to start domU with 2 gb of ram but only 1840384k free (from xentop) xl give me the correct error: 
xl create /etc/xen/W7-04.cfg
Parsing config from /etc/xen/W7-04.cfg
libxl: notice: libxl_numa.c:494:libxl__get_numa_candidate: NUMA placement failed, performance might be affected xc: error: Could not allocate memory for HVM guest as we cannot claim memory! (12 = Cannot allocate memory): Internal error 
libxl: error: libxl_dom.c:651:libxl__build_hvm: hvm building failed
libxl: error: libxl_create.c:1067:domcreate_rebuild_done: cannot (re-)build domain: -3 libxl: error: libxl_dm.c:1486:kill_device_model: unable to find device model pid in /local/domain/30/image/device-model-pid libxl: error: libxl.c:1421:libxl__destroy_domid: libxl__destroy_device_model failed for 30
If I try to start the same domU with 1792 mb of ram xl don't stop for xc memory error but starts and fails when qemu crash on start: 
xl create /etc/xen/W7-04.cfg
Parsing config from /etc/xen/W7-04.cfg
libxl: notice: libxl_numa.c:494:libxl__get_numa_candidate: NUMA placement failed, performance might be affected libxl: error: libxl_dm.c:1390:device_model_spawn_outcome: domain 31 device model: spawn failed (rc=-3) libxl: error: libxl_create.c:1231:domcreate_devmodel_started: device model did not start: -3 libxl: error: libxl_dm.c:1494:kill_device_model: Device Model already exited 
/var/log/xen/qemu-dm-W7-04.log
qemu: hardware error: xen: failed to populate ram at 6c002000
This problem is happen to me with qxl vga that have big quantity of videoram (128mb) but I think can happen also with other emulated vga even if with lower probability. Exact xen source used is: https://github.com/Fantu/Xen/commits/rebase/m2r-testing (based on xen 4.4-stable branch) 

/etc/xen/W7-04.cfg

name='W7-04'
builder="hvm"
memory=1792
vcpus=2
acpi_s3=0
acpi_s4=0
#vif=['model=e1000,bridge=xenbr0']
vif=['bridge=xenbr0,mac=00:16:3e:41:b6:2d']
disk=['/mnt/vm/disks/W7-04.disk1.xm,raw,hda,rw',',raw,hdb,ro,cdrom']
boot='dc'
device_model_version="qemu-xen"
viridian=1
vnc=0
keymap="it"
on_crash="destroy"
vga="qxl"
spice=1
spicehost='0.0.0.0'
spiceport=6004
spicedisable_ticketing=1
spicevdagent=1
spice_clipboard_sharing=0
spiceusbredirection=4
soundhw="hda"
localtime=1
usbversion=2


Full xl create with debug:

xl -vvv create /etc/xen/W7-04.cfg
Parsing config from /etc/xen/W7-04.cfg
libxl: debug: libxl_create.c:1387:do_domain_create: ao 0x1dd3f80: create: how=(nil) callback=(nil) poller=0x1dd3fe0 libxl: debug: libxl_device.c:251:libxl__device_disk_set_backend: Disk vdev=hda spec.backend=unknown libxl: debug: libxl_device.c:197:disk_try_backend: Disk vdev=hda, backend phy unsuitable as phys path not a block device libxl: debug: libxl_device.c:286:libxl__device_disk_set_backend: Disk vdev=hda, using backend qdisk libxl: debug: libxl_device.c:251:libxl__device_disk_set_backend: Disk vdev=hdb spec.backend=unknown libxl: debug: libxl_device.c:197:disk_try_backend: Disk vdev=hdb, backend phy unsuitable as phys path not a block device libxl: debug: libxl_device.c:286:libxl__device_disk_set_backend: Disk vdev=hdb, using backend qdisk libxl: debug: libxl_create.c:842:initiate_domain_create: running bootloader libxl: debug: libxl_bootloader.c:321:libxl__bootloader_run: not a PV domain, skipping bootloader libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch w=0x1dd44c8: deregister unregistered libxl: notice: libxl_numa.c:494:libxl__get_numa_candidate: NUMA placement failed, performance might be affected 
xc: detail: elf_parse_binary: phdr: paddr=0x100000 memsz=0x595b0
xc: detail: elf_parse_binary: memory: 0x100000 -> 0x1595b0
xc: detail: VIRTUAL MEMORY ARRANGEMENT:
  Loader:        0000000000100000->00000000001595b0
  Modules:       0000000000000000->0000000000000000
  TOTAL:         0000000000000000->0000000068000000
  ENTRY ADDRESS: 0000000000100000
xc: detail: PHYSICAL MEMORY ALLOCATION:
  4KB PAGES: 0x0000000000000200
  2MB PAGES: 0x000000000000033f
  1GB PAGES: 0x0000000000000000
xc: detail: elf_load_binary: phdr 0 at 0x7ff0a9342000 -> 0x7ff0a939254d
libxl: debug: libxl_device.c:251:libxl__device_disk_set_backend: Disk vdev=hda spec.backend=qdisk libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch w=0x1dd63e0: deregister unregistered libxl: debug: libxl_device.c:251:libxl__device_disk_set_backend: Disk vdev=hdb spec.backend=qdisk libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch w=0x1dd7210: deregister unregistered libxl: debug: libxl_dm.c:1322:libxl__spawn_local_dm: Spawning device-model /usr/lib/xen/bin/qemu-system-i386 with arguments: libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: /usr/lib/xen/bin/qemu-system-i386 
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -xen-domid
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   32
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -chardev
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: socket,id=libxl-cmd,path=/var/run/xen/qmp-libxl-32,server,nowait 
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -mon
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: chardev=libxl-cmd,mode=control 
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -nodefaults
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -name
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   W7-04
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -k
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   it
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -spice
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: port=6004,tls-port=0,addr=0.0.0.0,disable-ticketing,agent-mouse=on,disable-copy-paste 
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -device
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: virtio-serial
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -chardev
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: spicevmc,id=vdagent,name=vdagent 
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -device
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: virtserialport,chardev=vdagent,name=com.redhat.spice.0 
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -device
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: qxl-vga,vram_size_mb=64,ram_size_mb=64 
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -boot
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   order=dc
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -device
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: ich9-usb-ehci1,id=usb,addr=0x1d.0x7,multifunction=on 
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -device
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: ich9-usb-uhci1,masterbus=usb.0,firstport=0,addr=0x1d.0,multifunction=on 
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -device
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: ich9-usb-uhci2,masterbus=usb.0,firstport=2,addr=0x1d.0x1,multifunction=on 
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -device
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: ich9-usb-uhci3,masterbus=usb.0,firstport=4,addr=0x1d.0x2,multifunction=on 
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -chardev
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: spicevmc,name=usbredir,id=usbrc1 
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -device
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: usb-redir,chardev=usbrc1,id=usbrc1 
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -chardev
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: spicevmc,name=usbredir,id=usbrc2 
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -device
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: usb-redir,chardev=usbrc2,id=usbrc2 
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -chardev
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: spicevmc,name=usbredir,id=usbrc3 
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -device
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: usb-redir,chardev=usbrc3,id=usbrc3 
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -chardev
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: spicevmc,name=usbredir,id=usbrc4 
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -device
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: usb-redir,chardev=usbrc4,id=usbrc4 
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -soundhw
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   hda
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -smp
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   2,maxcpus=2
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -device
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: rtl8139,id=nic0,netdev=net0,mac=00:16:3e:41:b6:2d 
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -netdev
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: type=tap,id=net0,ifname=vif32.0-emu,script=no,downscript=no 
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -machine
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   xenfv
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -m
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   1664
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -drive
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: file=/mnt/vm/disks/W7-04.disk1.xm,if=ide,index=0,media=disk,format=raw,cache=writeback 
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm:   -drive
libxl: debug: libxl_dm.c:1324:libxl__spawn_local_dm: if=ide,index=1,media=cdrom,cache=writeback,id=ide-832 libxl: debug: libxl_event.c:570:libxl__ev_xswatch_register: watch w=0x1dd4700 wpath=/local/domain/0/device-model/32/state token=3/0: register slotnum=3 libxl: debug: libxl_create.c:1401:do_domain_create: ao 0x1dd3f80: inprogress: poller=0x1dd3fe0, flags=i libxl: debug: libxl_event.c:514:watchfd_callback: watch w=0x1dd4700 wpath=/local/domain/0/device-model/32/state token=3/0: event epath=/local/domain/0/device-model/32/state libxl: debug: libxl_event.c:606:libxl__ev_xswatch_deregister: watch w=0x1dd4700 wpath=/local/domain/0/device-model/32/state token=3/0: deregister slotnum=3 libxl: error: libxl_dm.c:1390:device_model_spawn_outcome: domain 32 device model: spawn failed (rc=-3) libxl: error: libxl_create.c:1231:domcreate_devmodel_started: device model did not start: -3 libxl: error: libxl_dm.c:1494:kill_device_model: Device Model already exited libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch w=0x1dda7f0: deregister unregistered libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch w=0x1dda910: deregister unregistered libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch w=0x1ddab50: deregister unregistered libxl: debug: libxl_event.c:1591:libxl__ao_complete: ao 0x1dd3f80: complete, rc=-3 
libxl: debug: libxl_event.c:1563:libxl__ao__destroy: ao 0x1dd3f80: destroy
xc: debug: hypercall buffer: total allocations:855 total releases:855
xc: debug: hypercall buffer: current allocations:0 maximum allocations:4
xc: debug: hypercall buffer: cache current size:4
xc: debug: hypercall buffer: cache hits:847 misses:4 toobig:4


If you need more informations and/or tests tell me and I'll post them.

Thanks for any reply and sorry for my bad english.


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