(relo'd from user list)
I've launched an Ubuntu PVHVM guest, on a Xen 4.7 host
cat guest1.cfg
name = 'guest1'
builder = 'hvm'
xen_platform_pci = 1
device_model_version = 'qemu-xen'
bios = 'ovmf'
bios_override = '/usr/share/qemu/ovmf-x86_64.bin'
...
On guest launch, `xl dmesg` in host reports
...
(XEN) [2016-06-27 21:54:09] HVM1 restore: CPU 0
(d1) [2016-06-27 21:54:10] HVM Loader
(d1) [2016-06-27 21:54:10] Detected Xen v4.7.0_08-452
(d1) [2016-06-27 21:54:10] Xenbus rings @0xfeffc000, event channel 1
(d1) [2016-06-27 21:54:10] System requested OVMF
(d1) [2016-06-27 21:54:10] CPU speed is 3093 MHz
(d1) [2016-06-27 21:54:10] Relocating guest memory for lowmem MMIO
space disabled
(d1) [2016-06-27 21:54:10] PCI-ISA link 0 routed to IRQ5
(d1) [2016-06-27 21:54:10] PCI-ISA link 1 routed to IRQ10
(d1) [2016-06-27 21:54:10] PCI-ISA link 2 routed to IRQ11
(d1) [2016-06-27 21:54:10] PCI-ISA link 3 routed to IRQ5
(d1) [2016-06-27 21:54:10] pci dev 01:3 INTA->IRQ10
(d1) [2016-06-27 21:54:10] pci dev 02:0 INTA->IRQ11
(d1) [2016-06-27 21:54:10] pci dev 04:0 INTA->IRQ5
(d1) [2016-06-27 21:54:10] No RAM in high memory; setting high_mem
resource base to 100000000
(d1) [2016-06-27 21:54:10] pci dev 02:0 bar 14 size 001000000:
0f0000008
(d1) [2016-06-27 21:54:10] pci dev 03:0 bar 10 size 001000000:
0f1000008
(d1) [2016-06-27 21:54:10] pci dev 04:0 bar 30 size 000040000:
0f2000000
(d1) [2016-06-27 21:54:10] pci dev 04:0 bar 10 size 000020000:
0f2040000
(d1) [2016-06-27 21:54:10] pci dev 03:0 bar 30 size 000010000:
0f2060000
(d1) [2016-06-27 21:54:10] pci dev 03:0 bar 18 size 000001000:
0f2070000
(d1) [2016-06-27 21:54:10] pci dev 02:0 bar 10 size 000000100:
00000c001
(d1) [2016-06-27 21:54:10] pci dev 04:0 bar 14 size 000000040:
00000c101
(d1) [2016-06-27 21:54:10] pci dev 01:1 bar 20 size 000000010:
00000c141
(d1) [2016-06-27 21:54:10] Multiprocessor initialisation:
(d1) [2016-06-27 21:54:10] - CPU0 ... 39-bit phys ... fixed MTRRs
... var MTRRs [1/8] ... done.
(d1) [2016-06-27 21:54:10] Writing SMBIOS tables ...
(d1) [2016-06-27 21:54:10] Loading OVMF ...
(XEN) [2016-06-27 21:54:10] d1v0 Over-allocation for domain 1:
524545 > 524544
(d1) [2016-06-27 21:54:10] Loading ACPI ...
(d1) [2016-06-27 21:54:10] vm86 TSS at fc009f00
(d1) [2016-06-27 21:54:10] BIOS map:
(d1) [2016-06-27 21:54:10] ffe00000-ffffffff: Main BIOS
(d1) [2016-06-27 21:54:10] E820 table:
(d1) [2016-06-27 21:54:10] [00]: 00000000:00000000 -
00000000:000a0000: RAM
(d1) [2016-06-27 21:54:10] HOLE: 00000000:000a0000 - 00000000:000f0000
(d1) [2016-06-27 21:54:10] [01]: 00000000:000f0000 -
00000000:00100000: RESERVED
(d1) [2016-06-27 21:54:10] [02]: 00000000:00100000 -
00000000:7eeb6000: RAM
(d1) [2016-06-27 21:54:10] HOLE: 00000000:7eeb6000 - 00000000:fc000000
(d1) [2016-06-27 21:54:10] [03]: 00000000:fc000000 -
00000001:00000000: RESERVED
(d1) [2016-06-27 21:54:10] Invoking OVMF ...
At this point, the guest's up
xl list
Name ID Mem VCPUs
State Time(s)
Domain-0 0 4096 1
r----- 31.1
guest1 1 2049 1
-b---- 17.4
, accessible and functional.,
uname -a
Linux guest1 4.4.0-24-generic #43-Ubuntu SMP Wed Jun 8 19:27:37
UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
As long as the guest is up, the Host logs continuously fill up with
over-allocation errors.
xl dmesg
(XEN) [2016-06-27 21:54:32] d1v0 Over-allocation for domain 1:
524545 > 524544
(XEN) [2016-06-27 21:54:32] d1v0 Over-allocation for domain 1:
524545 > 524544
(XEN) [2016-06-27 21:54:34] d1v0 Over-allocation for domain 1:
524545 > 524544
(XEN) [2016-06-27 21:54:38] d1v0 Over-allocation for domain 1:
524545 > 524544
(XEN) [2016-06-27 21:54:46] d1v0 Over-allocation for domain 1:
524545 > 524544
(XEN) [2016-06-27 21:55:02] d1v0 Over-allocation for domain 1:
524545 > 524544
(XEN) [2016-06-27 21:55:35] d1v0 Over-allocation for domain 1:
524545 > 524544
(XEN) [2016-06-27 21:56:07] d1v0 Over-allocation for domain 1:
524545 > 524544
(XEN) [2016-06-27 21:56:39] d1v0 Over-allocation for domain 1:
524545 > 524544
(XEN) [2016-06-27 21:57:11] d1v0 Over-allocation for domain 1:
524545 > 524544
(XEN) [2016-06-27 21:57:43] d1v0 Over-allocation for domain 1:
524545 > 524544
(XEN) [2016-06-27 21:58:15] d1v0 Over-allocation for domain 1:
524545 > 524544
(XEN) [2016-06-27 21:58:47] d1v0 Over-allocation for domain 1:
524545 > 524544
...
with multiple guests, it quickly gets ridiculous,
xl dmesg | grep -i Over-allocation | wc -l
22787
What are these 'Over-allocation' messages?
What needs to be fixed, or if of no concern, can these messages be silenced?
Happy to provide any identified additional logs.
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