This is a second post regrading running Windows Guest OS. Does anyone has Windows Guest OS running successfully with the Dom0 has all the physical memory allocated? If I don''t lower the memory assign to Dom0 through grub, I will not be able to run a Windows Guest OS. This what I got Using config file "/etc/xen/Win2k3R2-01". Error: (12, ''Cannot allocate memory'') and here is the xm dmesg [root@sfxen01 ~]# xm dmesg __ __ _____ ___ _____ ____ __ __ \ \/ /___ _ __ |___ / / _ \ |___ / _ __ ___| ___| / _| ___ / /_ \ // _ \ ''_ \ |_ \| | | | |_ \ __| ''__/ __|___ \ | |_ / __| ''_ \ / \ __/ | | | ___) | |_| | ___) |__| | | (__ ___) || _| (__| (_) | /_/\_\___|_| |_| |____(_)___(_)____/ |_| \___|____(_)_| \___|\___/ http://www.cl.cam.ac.uk/netos/xen University of Cambridge Computer Laboratory Xen version 3.0.3-rc5-1.2849.fc6 (brewbuilder@build.redhat.com) (gcc version 4.1.1 20061011 (Red Hat 4.1.1-30)) Fri Nov 10 12:36:50 EST 2006 Latest ChangeSet: unavailable (XEN) Command line: /xen.gz-2.6.18-1.2849.fc6 (XEN) WARNING: Only the first 16 GB of the physical memory map can be accessed (XEN) by Xen in 32-bit mode. Truncating the memory map... (XEN) Physical RAM map: (XEN) 0000000000000000 - 00000000000a0000 (usable) (XEN) 0000000000100000 - 00000000cffa8000 (usable) (XEN) 00000000cffa8000 - 00000000cffb7c00 (ACPI data) (XEN) 00000000cffb7c00 - 00000000d0000000 (reserved) (XEN) 00000000e0000000 - 00000000f0000000 (reserved) (XEN) 00000000fe000000 - 0000000100000000 (reserved) (XEN) 0000000100000000 - 0000000400000000 (usable) (XEN) System RAM: 15615MB (15990048kB) (XEN) Xen heap: 9MB (9864kB) (XEN) PAE enabled, limit: 16 GB (XEN) found SMP MP-table at 000fe710 (XEN) DMI 2.4 present. (XEN) Using APIC driver default (XEN) ACPI: RSDP (v002 DELL ) @ 0x000f2a00 (XEN) ACPI: XSDT (v001 DELL PE_SC3 0x00000001 DELL 0x00000001) @ 0x000f2a80 (XEN) ACPI: FADT (v003 DELL PE_SC3 0x00000001 DELL 0x00000001) @ 0x000f2b88 (XEN) ACPI: MADT (v001 DELL PE_SC3 0x00000001 DELL 0x00000001) @ 0x000f2c7c (XEN) ACPI: SPCR (v001 DELL PE_SC3 0x00000001 DELL 0x00000001) @ 0x000f2d5d (XEN) ACPI: HPET (v001 DELL PE_SC3 0x00000001 DELL 0x00000001) @ 0x000f2dad (XEN) ACPI: MCFG (v001 DELL PE_SC3 0x00000001 DELL 0x00000001) @ 0x000f2de5 (XEN) ACPI: DSDT (v001 DELL PE_SC3 0x00000001 MSFT 0x0100000e) @ 0x00000000 (XEN) ACPI: Local APIC address 0xfee00000 (XEN) ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled) (XEN) Processor #0 6:15 APIC version 20 (XEN) ACPI: LAPIC (acpi_id[0x02] lapic_id[0x06] enabled) (XEN) Processor #6 6:15 APIC version 20 (XEN) ACPI: LAPIC (acpi_id[0x03] lapic_id[0x01] enabled) (XEN) Processor #1 6:15 APIC version 20 (XEN) ACPI: LAPIC (acpi_id[0x04] lapic_id[0x07] enabled) (XEN) Processor #7 6:15 APIC version 20 (XEN) ACPI: LAPIC (acpi_id[0x05] lapic_id[0x14] disabled) (XEN) ACPI: LAPIC (acpi_id[0x06] lapic_id[0x15] disabled) (XEN) ACPI: LAPIC (acpi_id[0x07] lapic_id[0x16] disabled) (XEN) ACPI: LAPIC (acpi_id[0x08] lapic_id[0x17] disabled) (XEN) ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1]) (XEN) ACPI: LAPIC_NMI (acpi_id[0x02] high edge lint[0x1]) (XEN) ACPI: LAPIC_NMI (acpi_id[0x03] high edge lint[0x1]) (XEN) ACPI: LAPIC_NMI (acpi_id[0x04] high edge lint[0x1]) (XEN) ACPI: LAPIC_NMI (acpi_id[0x05] high edge lint[0x1]) (XEN) ACPI: LAPIC_NMI (acpi_id[0x06] high edge lint[0x1]) (XEN) ACPI: LAPIC_NMI (acpi_id[0x07] high edge lint[0x1]) (XEN) ACPI: LAPIC_NMI (acpi_id[0x08] high edge lint[0x1]) (XEN) ACPI: IOAPIC (id[0x08] address[0xfec00000] gsi_base[0]) (XEN) IOAPIC[0]: apic_id 8, version 32, address 0xfec00000, GSI 0-23 (XEN) ACPI: IOAPIC (id[0x09] address[0xfec81000] gsi_base[64]) (XEN) IOAPIC[1]: apic_id 9, version 32, address 0xfec81000, GSI 64-87 (XEN) ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl) (XEN) ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level) (XEN) ACPI: IRQ0 used by override. (XEN) ACPI: IRQ2 used by override. (XEN) ACPI: IRQ9 used by override. (XEN) Enabling APIC mode: Flat. Using 2 I/O APICs (XEN) ACPI: HPET id: 0x8086a201 base: 0xfed00000 (XEN) Using ACPI (MADT) for SMP configuration information (XEN) Using scheduler: SMP Credit Scheduler (credit) (XEN) Initializing CPU#0 (XEN) Detected 2992.570 MHz processor. (XEN) CPU: L1 I cache: 32K, L1 D cache: 32K (XEN) CPU: Physical Processor ID: 0 (XEN) CPU: Processor Core ID: 0 (XEN) VMXON is done (XEN) Intel machine check architecture supported. (XEN) Intel machine check reporting enabled on CPU#0. (XEN) CPU0: Intel(R) Xeon(R) CPU 5160 @ 3.00GHz stepping 06 (XEN) Booting processor 1/6 eip 90000 (XEN) Initializing CPU#1 (XEN) CPU: L1 I cache: 32K, L1 D cache: 32K (XEN) CPU: Physical Processor ID: 3 (XEN) CPU: Processor Core ID: 0 (XEN) VMXON is done (XEN) Intel machine check architecture supported. (XEN) Intel machine check reporting enabled on CPU#1. (XEN) CPU1: Intel(R) Xeon(R) CPU 5160 @ 3.00GHz stepping 06 (XEN) Booting processor 2/1 eip 90000 (XEN) Initializing CPU#2 (XEN) CPU: L1 I cache: 32K, L1 D cache: 32K (XEN) CPU: Physical Processor ID: 0 (XEN) CPU: Processor Core ID: 1 (XEN) VMXON is done (XEN) Intel machine check architecture supported. (XEN) Intel machine check reporting enabled on CPU#2. (XEN) CPU2: Intel(R) Xeon(R) CPU 5160 @ 3.00GHz stepping 06 (XEN) Booting processor 3/7 eip 90000 (XEN) Initializing CPU#3 (XEN) CPU: L1 I cache: 32K, L1 D cache: 32K (XEN) CPU: Physical Processor ID: 3 (XEN) CPU: Processor Core ID: 1 (XEN) VMXON is done (XEN) Intel machine check architecture supported. (XEN) Intel machine check reporting enabled on CPU#3. (XEN) CPU3: Intel(R) Xeon(R) CPU 5160 @ 3.00GHz stepping 06 (XEN) Total of 4 processors activated. (XEN) ENABLING IO-APIC IRQs (XEN) -> Using new ACK method (XEN) ..TIMER: vector=0xF0 apic1=0 pin1=2 apic2=-1 pin2=-1 (XEN) checking TSC synchronization across 4 CPUs: passed. (XEN) Platform timer is 14.318MHz HPET (XEN) Brought up 4 CPUs (XEN) Machine check exception polling timer started. (XEN) *** LOADING DOMAIN 0 *** (XEN) Domain 0 kernel supports features = { 0000001f }. (XEN) Domain 0 kernel requires features = { 00000000 }. (XEN) PHYSICAL MEMORY ARRANGEMENT: (XEN) Dom0 alloc.: 000000000e000000->0000000010000000 (3924903 pages to be allocated) (XEN) VIRTUAL MEMORY ARRANGEMENT: (XEN) Loaded kernel: c0400000->c0807808 (XEN) Init. ramdisk: c0808000->c0cf9e00 (XEN) Phys-Mach map: c0cfa000->c1bfae9c (XEN) Start info: c1bfb000->c1bfb46c (XEN) Page tables: c1bfc000->c1c11000 (XEN) Boot stack: c1c11000->c1c12000 (XEN) TOTAL: c0000000->c2000000 (XEN) ENTRY ADDRESS: c0400000 (XEN) Dom0 has maximum 4 VCPUs (XEN) Initrd len 0x4f1e00, start at 0xc0808000 (XEN) Scrubbing Free RAM: ....................................................................................................................................................................done. (XEN) Xen trace buffers: disabled (XEN) Xen is relinquishing VGA console. (XEN) *** Serial input -> DOM0 (type ''CTRL-a'' three times to switch input to Xen). (XEN) (file=platform_hypercall.c, line=129) Domain 0 says that IO-APIC REGSEL is good (XEN) mtrr: type mismatch for d0000000,1000000 old: write-back new: write-combining (XEN) mtrr: type mismatch for d0000000,1000000 old: write-back new: write-combining (XEN) DOM2: (file=mm.c, line=586) Non-privileged (2) attempt to map I/O space 000000f8 (XEN) DOM2: (file=mm.c, line=586) Non-privileged (2) attempt to map I/O space 000000f8 xend.log : [2006-11-22 23:42:34 xend.XendDomainInfo 3162] DEBUG (XendDomainInfo:190) XendDo mainInfo.create([''vm'', [''name'', ''Win2k3R2-01''], [''memory'', ''768''], [''on_reboot'', ''restart''], [''on_crash'', ''restart''], [''vcpus'', 1], [''uuid'', ''5a59e56b-3b2f-8030 -db16-5e028cef4d0e''], [''image'', [''hvm'', [''kernel'', ''/usr/lib/xen/boot/hvmloader'' ], [''device_model'', ''/usr/lib/xen/bin/qemu-dm''], [''pae'', 1], [''vcpus'', 1], [''boo t'', ''c''], [''serial'', ''pty''], [''acpi'', 1], [''apic'', 1], [''vnc'', 1], [''vncunused'', 1], [''display'', ''localhost:10.0''], [''xauthority'', ''/root/.Xauthority'']]], [''dev ice'', [''vbd'', [''uname'', ''phy:/dev/VolGroup00/LogVol09''], [''dev'', ''hda''], [''mode'' , ''w'']]], [''device'', [''vbd'', [''uname'', ''file:/tmp/win2k3cd1.iso''], [''dev'', ''hdc: cdrom''], [''mode'', ''r'']]], [''device'', [''vif'', [''bridge'', ''xenbr0''], [''mac'', ''00:1 6:3e:65:9b:22''], [''type'', ''ioemu'']]]]) [2006-11-22 23:42:34 xend.XendDomainInfo 3162] DEBUG (XendDomainInfo:296) parseC onfig: config is [''vm'', [''name'', ''Win2k3R2-01''], [''memory'', ''768''], [''on_reboot'' , ''restart''], [''on_crash'', ''restart''], [''vcpus'', 1], [''uuid'', ''5a59e56b-3b2f-803 0-db16-5e028cef4d0e''], [''image'', [''hvm'', [''kernel'', ''/usr/lib/xen/boot/hvmloader ''], [''device_model'', ''/usr/lib/xen/bin/qemu-dm''], [''pae'', 1], [''vcpus'', 1], [''bo ot'', ''c''], [''serial'', ''pty''], [''acpi'', 1], [''apic'', 1], [''vnc'', 1], [''vncunused'' , 1], [''display'', ''localhost:10.0''], [''xauthority'', ''/root/.Xauthority'']]], [''de vice'', [''vbd'', [''uname'', ''phy:/dev/VolGroup00/LogVol09''], [''dev'', ''hda''], [''mode '', ''w'']]], [''device'', [''vbd'', [''uname'', ''file:/tmp/win2k3cd1.iso''], [''dev'', ''hdc :cdrom''], [''mode'', ''r'']]], [''device'', [''vif'', [''bridge'', ''xenbr0''], [''mac'', ''00: 16:3e:65:9b:22''], [''type'', ''ioemu'']]]] [2006-11-22 23:42:34 xend.XendDomainInfo 3162] DEBUG (XendDomainInfo:395) parseC onfig: result is {''shadow_memory'': None, ''uuid'': ''5a59e56b-3b2f-8030-db16-5e028c ef4d0e'', ''on_crash'': ''restart'', ''on_reboot'': ''restart'', ''localtime'': None, ''imag e'': [''hvm'', [''kernel'', ''/usr/lib/xen/boot/hvmloader''], [''device_model'', ''/usr/li b/xen/bin/qemu-dm''], [''pae'', 1], [''vcpus'', 1], [''boot'', ''c''], [''serial'', ''pty''], [''acpi'', 1], [''apic'', 1], [''vnc'', 1], [''vncunused'', 1], [''display'', ''localhost: 10.0''], [''xauthority'', ''/root/.Xauthority'']], ''on_poweroff'': None, ''bootloader_a rgs'': None, ''cpus'': None, ''name'': ''Win2k3R2-01'', ''backend'': [], ''vcpus'': 1, ''cpu _weight'': None, ''features'': None, ''vcpu_avail'': None, ''memory'': 768, ''device'': [ (''vbd'', [''vbd'', [''uname'', ''phy:/dev/VolGroup00/LogVol09''], [''dev'', ''hda''], [''mod e'', ''w'']]), (''vbd'', [''vbd'', [''uname'', ''file:/tmp/win2k3cd1.iso''], [''dev'', ''hdc:c drom''], [''mode'', ''r'']]), (''vif'', [''vif'', [''bridge'', ''xenbr0''], [''mac'', ''00:16:3e :65:9b:22''], [''type'', ''ioemu'']])], ''bootloader'': None, ''cpu'': None, ''maxmem'': No ne} [2006-11-22 23:42:34 xend.XendDomainInfo 3162] DEBUG (XendDomainInfo:1253) XendD omainInfo.construct: None [2006-11-22 23:42:34 xend.XendDomainInfo 3162] DEBUG (XendDomainInfo:1285) XendD omainInfo.initDomain: 4 1.0 [2006-11-22 23:42:34 xend 3162] DEBUG (image:379) args: boot, val: c [2006-11-22 23:42:34 xend 3162] DEBUG (image:379) args: fda, val: None [2006-11-22 23:42:34 xend 3162] DEBUG (image:379) args: fdb, val: None [2006-11-22 23:42:34 xend 3162] DEBUG (image:379) args: soundhw, val: None [2006-11-22 23:42:34 xend 3162] DEBUG (image:379) args: localtime, val: None [2006-11-22 23:42:34 xend 3162] DEBUG (image:379) args: serial, val: pty [2006-11-22 23:42:34 xend 3162] DEBUG (image:379) args: std-vga, val: None [2006-11-22 23:42:34 xend 3162] DEBUG (image:379) args: isa, val: None [2006-11-22 23:42:34 xend 3162] DEBUG (image:379) args: vcpus, val: 1 [2006-11-22 23:42:34 xend 3162] DEBUG (image:379) args: acpi, val: 1 [2006-11-22 23:42:34 xend 3162] DEBUG (image:379) args: usb, val: None [2006-11-22 23:42:34 xend 3162] DEBUG (image:379) args: usbdevice, val: None [2006-11-22 23:42:34 xend 3162] DEBUG (balloon:127) Balloon: 806556 KiB free; ne ed 805684; done. [2006-11-22 23:42:34 xend 3162] INFO (image:138) buildDomain os=hvm dom=4 vcpus1 [2006-11-22 23:42:34 xend 3162] DEBUG (image:338) dom = 4 [2006-11-22 23:42:34 xend 3162] DEBUG (image:339) image /usr/lib/xen/ boot/hvmloader [2006-11-22 23:42:34 xend 3162] DEBUG (image:340) store_evtchn = 1 [2006-11-22 23:42:34 xend 3162] DEBUG (image:341) memsize = 768 [2006-11-22 23:42:34 xend 3162] DEBUG (image:342) vcpus = 1 [2006-11-22 23:42:34 xend 3162] DEBUG (image:343) pae = 1 [2006-11-22 23:42:34 xend 3162] DEBUG (image:344) acpi = 1 [2006-11-22 23:42:34 xend 3162] DEBUG (image:345) apic = 1 [2006-11-22 23:42:34 xend 3162] DEBUG (image:467) hvm shutdown watch registered [2006-11-22 23:42:34 xend.XendDomainInfo 3162] ERROR (XendDomainInfo:202) Domain construction failed Traceback (most recent call last): File "/usr/lib/python2.4/site-packages/xen/xend/XendDomainInfo.py", line 195, in create vm.initDomain() File "/usr/lib/python2.4/site-packages/xen/xend/XendDomainInfo.py", line 1363, in initDomain raise VmError(str(exn)) VmError: (12, ''Cannot allocate memory'') [2006-11-22 23:42:34 xend.XendDomainInfo 3162] DEBUG (XendDomainInfo:1449) XendD omainInfo.destroy: domid=4 [2006-11-22 23:42:34 xend.XendDomainInfo 3162] DEBUG (XendDomainInfo:1457) XendD omainInfo.destroyDomain(4) [2006-11-22 23:42:34 xend 3162] DEBUG (image:479) hvm shutdown watch unregistere d [2006-11-22 23:42:34 xend 3162] ERROR (xswatch:70) read_watch failed Traceback (most recent call last): File "/usr/lib/python2.4/site-packages/xen/xend/xenstore/xswatch.py", line 66, in watchMain res = watch.fn(we[0], *watch.args, **watch.kwargs) File "/usr/lib/python2.4/site-packages/xen/xend/image.py", line 489, in hvm_sh utdown reason = vm.readDom(''control/shutdown'') AttributeError: ''NoneType'' object has no attribute ''readDom''