[Xen-devel] Unexpected behavior: Xen creating domains on startup

[Bruno Alvisio <bruno.alvisio@xxxxxxxxx>]

Hello all,

I am doing some testing with Xen. After some of the guest domains I am testing crashed, I decided to add some logging to Xen and the tools. After rebuilding, reinstalling and rebooting the system, Xen seems to create guest domains (the ones created before reboot) on startup (with no 'xl create' command issued by me). The domains are deleted a few seconds after startup and when I create the first domain, the domain number is not 1 but 3 or 4. Below is an example of dmesg logs right after startup: (int this case a domain 2 was launched, xl list shows no domain few seconds later):

(XEN) Dom0 has maximum 8 VCPUs

(XEN) ELF: phdr 0 at 0xffffffff81000000 -> 0xffffffff81aca000

(XEN) ELF: phdr 1 at 0xffffffff81c00000 -> 0xffffffff81d1e000

(XEN) ELF: phdr 2 at 0xffffffff81d1e000 -> 0xffffffff81d37418

(XEN) ELF: phdr 3 at 0xffffffff81d38000 -> 0xffffffff81e82000

(XEN) Initial low memory virq threshold set at 0x4000 pages.

(XEN) Scrubbing Free RAM on 1 nodes using 4 CPUs

(XEN) ..................................done.

(XEN) Std. Loglevel: All

(XEN) Guest Loglevel: All

(XEN) Xen is relinquishing VGA console.

(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch input to Xen)

(XEN) Freed 456kB init memory

(XEN) PCI add device 0000:00:00.0

(XEN) PCI add device 0000:00:01.0

(XEN) PCI add device 0000:00:16.0

(XEN) PCI add device 0000:00:16.1

(XEN) PCI add device 0000:00:1a.0

(XEN) PCI add device 0000:00:1d.0

(XEN) PCI add device 0000:00:1e.0

(XEN) PCI add device 0000:00:1f.0

(XEN) PCI add device 0000:00:1f.2

(XEN) PCI add device 0000:00:1f.3

(XEN) PCI add device 0000:01:00.0

(XEN) PCI add device 0000:01:00.1

(XEN) PCI add device 0000:02:03.0

(XEN) PCI: Using MCFG for segment 0000 bus 00-ff

(XEN) d0: Forcing read-only access to MFN fed00

(XEN) traps.c:1540: GPF (0000): ffff82d080363383 [emul-priv-op.c#read_msr+0x370/0x45c] -> ffff82d08036d9b2

(XEN) traps.c:1540: GPF (0000): ffff82d080363383 [emul-priv-op.c#read_msr+0x370/0x45c] -> ffff82d08036d9b2

(XEN) traps.c:1540: GPF (0000): ffff82d080363383 [emul-priv-op.c#read_msr+0x370/0x45c] -> ffff82d08036d9b2

(XEN) grant_table.c:1688:d0v1 Expanding d1 grant table from 0 to 1 frames

(XEN) HVM1 restore: CPU 0

(XEN) HVM1 restore: CPU 1

(XEN) HVM1 restore: PIC 0

(XEN) HVM1 restore: PIC 1

(XEN) HVM1 restore: IOAPIC 0

(XEN) HVM1 restore: LAPIC 0

(XEN) HVM1 restore: LAPIC 1

(XEN) HVM1 restore: LAPIC_REGS 0

(XEN) HVM1 restore: LAPIC_REGS 1

(XEN) HVM1 restore: PCI_IRQ 0

(XEN) HVM1 restore: ISA_IRQ 0

(XEN) HVM1 restore: PCI_LINK 0

(XEN) HVM1 restore: PIT 0

(XEN) HVM1 restore: RTC 0

(XEN) HVM1 restore: HPET 0

(XEN) HVM1 restore: PMTIMER 0

(XEN) HVM1 restore: MTRR 0

(XEN) HVM1 restore: MTRR 1

(XEN) HVM1 restore: CPU_XSAVE 0

(XEN) HVM1 restore: CPU_XSAVE 1

(XEN) HVM1 restore: VMCE_VCPU 0

(XEN) HVM1 restore: VMCE_VCPU 1

(XEN) HVM1 restore: TSC_ADJUST 0

(XEN) HVM1 restore: TSC_ADJUST 1

(XEN) grant_table.c:1688:d0v6 Expanding d2 grant table from 0 to 1 frames

(d2) Bootstrapping...

(d2) Xen Minimal OS (pv)!

(d2)   start_info: 0x574000(VA)

(d2)     nr_pages: 0x2000

(d2)   shared_inf: 0x06182000(MA) 

Any explanation/idea on what could be occurring would be appreciated.

Cheers,

Bruno

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