[Xen-users] Xen 4.4 - Error passing more than 4 bridges to a guest

[Bill Gercken <bgercken@xxxxxxxxx>]

Hello,

Â

I have an issue where passing more than 4 bridges to a guest causes guest startup to fail due to memory issues.

Â

The same guest configuration will start fine with 4 bridges passed.Â

Â

I have researched this quite a bit and have not found the solution. Any help is greatly appreciated.

Â

The error message that I am seeing is as follows.

Â

Thanks.

-bill

Â

ÂError Message:
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[root@rhel7xen xen]# xl create rhel-vm5.hvm
Parsing config from rhel-vm5.hvm
libxl: error: libxl_dm.c:1371:device_model_spawn_outcome: domain 2 device model: spawn failed (rc=-3)
libxl: error: libxl_create.c:1186:domcreate_devmodel_started: device model did not start: -3
libxl: error: libxl_dm.c:1475:kill_device_model: Device Model already exited
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Relevant info from xl dmesg:
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(XEN) page_alloc.c:1468:d0 Over-allocation for domain 2: 1048833 > 1048832
(XEN) memory.c:158:d0 Could not allocate order=0 extent: id=2 memflags=0 (8 of 64)
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Guest config file (rhel-vm5.hvm):
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builder = "hvm"
memory = 4096
#maxmem = 512
vcpus = 1
name = "rhvm5-dev"

#vif = [ 'bridge=xenbr0' ]

vif = [
ÂÂÂÂÂÂÂ 'bridge=xenbr1',
ÂÂÂÂÂÂÂ 'bridge=xenbr2',
ÂÂÂÂÂÂÂ 'bridge=xenbr3',
ÂÂÂÂÂÂÂ 'bridge=xenbr4',
ÂÂÂÂÂÂÂ 'bridge=xenbr5',
ÂÂÂÂÂÂÂ 'bridge=xenbr6',
ÂÂÂÂÂÂÂ 'bridge=xenbr7'
ÂÂÂÂÂ ]

boot="c"
disk = [
ÂÂÂÂÂÂÂ '/dev/mapper/vg3-RHVM5_24G,,hda',
ÂÂÂÂÂÂÂ '/isos/rhel-server-6.5-x86_64-dvd.iso,,hdc:cdrom'
ÂÂÂÂÂÂÂ ]
serial='pty'
sdl=0
vnc=1
vnclisten="0.0.0.0"
vncpasswd="a"
usbdevice='tablet'

stdvga=1
monitor=1

# Support Physical Address Extension (enable for 64bit guest OS)
pae=1
# Advanced Configuration and Power Interface (default)
acpi=1
# Advanced programmable interrupt controller (default)
apic=1
# Enable or disbale xen platform pci
#ÂÂ - if you set this to zero it disables the PV driver (vif) and
#ÂÂ uses driver emulation.
xen_platform_pci=1

# Time Stamp Counter
tsc_mode="default"
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Â

[root@rhel7xen xen]# xl info -n
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
hostÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ : rhel7xen
releaseÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ : 3.10.51
versionÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ : #1 SMP Tue Aug 5 13:01:33 EDT 2014
machineÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ : x86_64
nr_cpusÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ : 12
max_cpu_idÂÂÂÂÂÂÂÂÂÂÂÂ : 11
nr_nodesÂÂÂÂÂÂÂÂÂÂÂÂÂÂ : 1
cores_per_socketÂÂÂÂÂÂ : 6
threads_per_coreÂÂÂÂÂÂ : 2
cpu_mhzÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ : 2300
hw_capsÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ : bfebfbff:2c100800:00000000:00003f00:17bee3ff:00000000:00000001:00000000
virt_capsÂÂÂÂÂÂÂÂÂÂÂÂÂ : hvm hvm_directio
total_memoryÂÂÂÂÂÂÂÂÂÂ : 65499
free_memoryÂÂÂÂÂÂÂÂÂÂÂ : 56465
sharing_freed_memoryÂÂ : 0
sharing_used_memoryÂÂÂ : 0
outstanding_claimsÂÂÂÂ : 0
free_cpusÂÂÂÂÂÂÂÂÂÂÂÂÂ : 0
cpu_topologyÂÂÂÂÂÂÂÂÂÂ :
cpu:ÂÂÂ coreÂÂÂ socketÂÂÂÂ node
 0: 0 0 0
 1: 0 0 0
 2: 1 0 0
 3: 1 0 0
 4: 2 0 0
 5: 2 0 0
 6: 3 0 0
 7: 3 0 0
 8: 4 0 0
 9: 4 0 0
Â10:ÂÂÂÂÂÂ 5ÂÂÂÂÂÂÂ 0ÂÂÂÂÂÂÂ 0
Â11:ÂÂÂÂÂÂ 5ÂÂÂÂÂÂÂ 0ÂÂÂÂÂÂÂ 0
numa_infoÂÂÂÂÂÂÂÂÂÂÂÂÂ :
node:ÂÂÂ memsizeÂÂÂ memfreeÂÂÂ distances
ÂÂ 0:ÂÂÂÂ 67584ÂÂÂÂÂ 56465ÂÂÂÂÂ 10
xen_majorÂÂÂÂÂÂÂÂÂÂÂÂÂ : 4
xen_minorÂÂÂÂÂÂÂÂÂÂÂÂÂ : 4
xen_extraÂÂÂÂÂÂÂÂÂÂÂÂÂ : .2-pre
xen_versionÂÂÂÂÂÂÂÂÂÂÂ : 4.4.2-pre
xen_capsÂÂÂÂÂÂÂÂÂÂÂÂÂÂ : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64
xen_schedulerÂÂÂÂÂÂÂÂÂ : credit
xen_pagesizeÂÂÂÂÂÂÂÂÂÂ : 4096
platform_paramsÂÂÂÂÂÂÂ : virt_start=0xffff800000000000
xen_changesetÂÂÂÂÂÂÂÂÂ : Fri Oct 17 15:57:42 2014 +0200 git:c8ed54e-dirty
xen_commandlineÂÂÂÂÂÂÂ : placeholder dom0_mem=8192M,max:8192M dom0_max_vcpus=1 dom0_vcpus_pin loglvl=all guest_loglvl=all
cc_compilerÂÂÂÂÂÂÂÂÂÂÂ : gcc (GCC) 4.8.2 20140120 (Red Hat 4.8.2-16)
cc_compile_byÂÂÂÂÂÂÂÂÂ : bgercken
cc_compile_domainÂÂÂÂÂ :
cc_compile_dateÂÂÂÂÂÂÂ : Fri Nov 14 13:37:30 EST 2014
xend_config_formatÂÂÂÂ : 4
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Grub:
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
#
# XEN on 3.10.51 w/XSM/FLASK
#
menuentry 'RHEL Server 7 (3.10.51) Xen (4.4)(XSM/FLASK)' --class gnu-linux --class gnu --class os --class xen $menuentry_id_option 'xen-gnulinux-simple-' {

ÂÂ echoÂÂÂ 'Loading Xen 4.4 ...'

ÂÂ xen_opts="dom0_mem=8192M,max:8192M dom0_max_vcpus=1 dom0_vcpus_pin loglvl=all guest_loglvl=all"

ÂÂ # console_to_ring sync_console"

ÂÂ kern_args="placeholder root=/dev/mapper/vg0-lv_root ro net.ifnames=0"
ÂÂ kern_extras="rd_NO_LUKS rd_NO_MD rd_NO_DM xen-pciback.hide=(04:00.0)(04:00.1)(05:00.0)(05:00.1)(0b:00.0)(0b:00.1)(0c:00.0)(0c:00.1)"

ÂÂ multiboot /xen.gz placeholder ${xen_opts}
ÂÂ echo 'Loading Linux 3.10.51 ...'
ÂÂ module /vmlinuz-3.10.51 placeholder ${kern_args} ${kern_extras}
ÂÂ echo 'Loading initial ramdisk ...'
ÂÂ module --nounzip /initramfs-3.10.51.img
ÂÂ module /xenpolicy.24
}
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[root@rhel7xen xen]# xl getenforce
Permissive
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