I make a new domain0 kernel with CONFIG_IA64_DIG .It still panic. The log looks like:

Xen version 3.0-unstable (build@) (gcc version 3.4.6 20060404 (Red Hat 3.4.6-3)) Mon Aug 13 05:01:50 CST 2007 Latest ChangeSet: Sun Aug 12 12:19:13 2007 -0600 15696:5b19839d0365 07/24/07 02:14p 6,444,451 vmlinuz.gz (XEN) Xen command line: BOOT_IMAGE=scsi0:\EFI\redhat\xen.gz sched=credit (XEN) xen image pstart: 0x4000000, xenheap pend: 0x8000000 (XEN) Xen patching physical address access by offset: 0x0 (XEN) find_memory: efi_memmap_walk returns max_page=7ffed (XEN) Before xen_heap_start: f0000000041c6cb0 (XEN) After xen_heap_start: f0000000041dc000 (XEN) Init boot pages: 0x10000c0 -> 0x4000000. (XEN) Init boot pages: 0x8000000 -> 0x7f708000. (XEN) Init boot pages: 0x7fe58000 -> 0x7ff30000. (XEN) Init boot pages: 0x180000000 -> 0x1fd6a3000. (XEN) Init boot pages: 0x1fe5fd6b0 -> 0x1fec14010. (XEN) Init boot pages: 0x1fec14070 -> 0x1fec17f8e. (XEN) Init boot pages: 0x1fec17fc2 -> 0x1fec1a000. (XEN) Init boot pages: 0x1fef4131e -> 0x1fef4c010. (XEN) Init boot pages: 0x1fef4c8e0 -> 0x1ffe10000. (XEN) Init boot pages: 0x1ffe80000 -> 0x1fffb4000. (XEN) System RAM: 4071MB (4168848kB) (XEN) size of virtual frame_table: 10240kB (XEN) virtual machine to physical table: f6ffffffffc00098 size: 2080kB (XEN) max_page: 0x7ffed (XEN) allocating frame table/mpt table at mfn 0. (XEN) Xen heap: 62MB (63632kB) (XEN) Domain heap initialised: DMA width 32 bits (XEN) avail:0x3170074000000000, status:0x74000000000,control:0x3170000000000000, vm?0x10000000000 (XEN) WARNING: no opcode provided from hardware(0)!!! (XEN) vm buffer size: 1048576, order: 6 (XEN) vm_buffer: 0xf000000007e00000 (XEN) register_intr: changing vector 39 from IO-SAPIC-edge to IO-SAPIC-level (XEN) Using scheduler: SMP Credit Scheduler (credit) (XEN) Time init: (XEN) .... System Time: 3085033ns (XEN) .... scale: 2DD6BDFD5 (XEN) num_online_cpus=1, max_cpus=64 (XEN) Brought up 2 CPUs (XEN) xenoprof: using perfmon. (XEN) perfmon: version 2.0 IRQ 238 (XEN) perfmon: Montecito PMU detected, 27 PMCs, 35 PMDs, 12 counters (47 bits) (XEN) Maximum number of domains: 63; 18 RID bits per domain (XEN) *** LOADING DOMAIN 0 *** (XEN) Maximum permitted dom0 size: 3973MB (XEN) Reducing dom0 memory allocation from 4194304K to 4068672K to fit available memory (XEN) Dom0 kernel: 64-bit, lsb, paddr 0x4000000 -> 0x5385628 (XEN) METAPHYSICAL MEMORY ARRANGEMENT: (XEN) Kernel image: 4000000->5385628 (XEN) Entry address: 400ff20 (XEN) Init. ramdisk: 538c000 len 32731e (XEN) Start info.: 5388000->538c000 (XEN) Dom0 max_vcpus=2 (XEN) Dom0: 0xf000000007cd4080 (XEN) enable lsapic entry: 0xf00000007ff8325c (XEN) enable lsapic entry: 0xf00000007ff8328c (XEN) ACPI_INTERRUPT_CPEI disabled for Domain0 (XEN) Domain0 EFI passthrough: MPS=0x7ff82000 ACPI 2.0=0x7ff83000 ACPI=0x7ff84000 SMBIOS=0xf0000 (XEN) Scrubbing Free RAM: .done. (XEN) Xen trace buffers: disabled (XEN) Std. Loglevel: Errors and warnings (XEN) Guest Loglevel: Nothing (Rate-limited: Errors and warnings) (XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch input to Xen). (XEN) Freed 128kB init memory. (XEN) vcpu_set_itc: Setting ar.itc is currently disabled (this message is only displayed once) (XEN) WARN: GSI 3 in use by Xen. Linux version 2.6.18-xen (ronghui@vti-build) (gcc version 4.1.1) #1 SMP Thu Aug 30 12:20:07 CST 2007 EFI v1.00 by Xen/ia64: SALsystab=0x2178 MPS=0x7ff82000 ACPI 2.0=0x7ff83000 ACPI=0x7ff84000 SMBIOS=0xf0000 booting generic kernel on platform dig Initial ramdisk at: 0xe00000000538c000 (3306270 bytes) SAL 0.1: Xen/ia64 Xen/ia64 version 0.0 SAL: AP wakeup using external interrupt vector 0xf3 No logical to physical processor mapping available ACPI: Local APIC address c0000000fee00000 iosapic_register_platform_intr: invalid int type 0xff 2 CPUs available, 16 CPUs total Running on Xen! start_info_pfn=0x14e2 nr_pages=254292 flags=0x3 Virtual mem_map starts at 0xa0007ffffe470000 SMP: Allowing 16 CPUs, 14 hotplug CPUs Built 1 zonelists. Total pages: 250954 Kernel command line: nomca console=tty0 console=ttyS0,57600,8n1 root=/dev/VolGroup00/LogVol00 ro PID hash table entries: 4096 (order: 12, 32768 bytes) Console: colour VGA+ 80x25 Kernel panic - not syncing: Failed to setup Xen contiguous region <1>Unable to handle kernel NULL pointer dereference (address 0000000000000000) swapper[0]: Oops 11012296146944 [1] Modules linked in:

Pid: 0, CPU 0, comm: swapper psr : 00001210084a2010 ifs : 8000000000000389 ip : [<a00000010012c531>] Not tainted ip is at kmem_cache_alloc+0x131/0x2c0 unat: 0000000000000000 pfs : 4000000000000610 rsc : 0000000000000007 rnat: 0000000000000000 bsps: 0000000000000000 pr : 0000000000009989 ldrs: 0000000000000000 ccv : 0000000000000000 fpsr: 0009804c8a70433f csd : 0000000000000000 ssd : 0000000000000000 b0 : a00000010004b8f0 b6 : a00000010004bb40 b7 : a000000100014d70 f6 : 1003eee559c2687d4f864 f7 : 1003e9e3779b97f4a7c16 f8 : 1003e0a00000010003dd6 f9 : 000000000000000000000 f10 : 000000000000000000000 f11 : 000000000000000000000 r1 : a0000001011225a0 r2 : a000000100f23c58 r3 : 0000000000000001 r8 : fffffffffff00001 r9 : fffffffffff04c18 r10 : 0000000000000000 r11 : 0000000000000000 r12 : a000000100ce36a0 r13 : a000000100cdc000 r14 : 0000000000000001 r15 : fffffffffff00001 r16 : 0000000000000000 r17 : 0000000012000000 r18 : a000000100cdc018 r19 : a000000100ce3710 r20 : 0000000000000000 r21 : 0000000000000000 r22 : 0000000000000000 r23 : a000000100cdcf24 r24 : 0000000000000000 r25 : 0000000000000006 r26 : a000000100ce3714 r27 : a000000100ce3720 r28 : 0000000000000000 r29 : a000000100f2d1f8 r30 : a000000100ce3718 r31 : 000000007fffffff