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[Xen-devel] Failed to read /local/domain/0/backend/qdisk/26/51713/feature-flush-cache.

  • To: "=?gb18030?b?eGVuLWRldmVs?=" <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "=?gb18030?b?usa3rrCh?=" <fanh2010@xxxxxxxxxxx>
  • Date: Tue, 29 Oct 2013 12:02:04 +0800
  • Delivery-date: Tue, 29 Oct 2013 06:57:06 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xen.org>

a problem occurred as follow when i use xen running a os.how can i solve it?
here is my config

kernel = "/usr/lib/xen/boot/pv-grub-x86_32.gz"
memory = 1024
name = "vir3"
vcpus = 1
vif = ['']
#vif=["mac=00:16:3e:00:00:22, bridge=xenbr0"]
ip = ""
disk = ["tap:aio:/home/a/vir/new.img,xvda1,w"]
root = "/dev/xvda1 ro"
                            Xen Minimal OS!
  start_info: 0xa78000(VA)
    nr_pages: 0x40000
  shared_inf: 0x8bebd000(MA)
     pt_base: 0xa7b000(VA)
nr_pt_frames: 0x9
    mfn_list: 0x978000(VA)
   mod_start: 0x0(VA)
     mod_len: 0
       flags: 0x0
    cmd_line: root=/dev/xvda1 ro (hd0,0)/boot/grub/grub.conf
  stack:      0x956de0-0x976de0
MM: Init
      _text: 0x0(VA)
     _etext: 0x71008(VA)
   _erodata: 0x87000(VA)
     _edata: 0x8c768(VA)
stack start: 0x956de0(VA)
       _end: 0x977390(VA)
  start_pfn: a87
    max_pfn: 3fffd
Mapping memory range 0xc00000 - 0x3fffd000
setting 0x0-0x87000 readonly
skipped 0x1000
MM: Initialise page allocator for c81000(c81000)-0(3fffd000)
MM: done
Demand map pfns at 3fffe000-bfffe000.
Heap resides at bffff000-fffff000.
Initialising timer interface
Initialising console ... done.
gnttab_table mapped at 0x3fffe000.
Initialising scheduler
Thread "Idle": pointer: 0xbffff030, stack: 0x3ff20000
Thread "xenstore": pointer: 0xbffff4a0, stack: 0x3ff30000
xenbus initialised on irq 1 mfn 0x247795
Dummy main: start_info=0x976ee0
Thread "main": pointer: 0xbffff910, stack: 0x3ff40000
Thread "pcifront": pointer: 0xbffffd80, stack: 0x3ff50000
"main" "root=/dev/xvda1" "ro" "(hd0,0)/boot/grub/grub.conf"
pcifront_watches: waiting for backend path to appear device/pci/0/backend
vbd 51713 is hd0
******************* BLKFRONT for device/vbd/51713 **********

backend at /local/domain/0/backend/qdisk/26/51713
Failed to read /local/domain/0/backend/qdisk/26/51713/feature-flush-cache.
83888128 sectors of 0 bytes
    GNU GRUB  version 0.97  (1048576K lower / 0K upper memory)
       [ Minimal BASH-like line editing is supported.   For
         the   first   word,  TAB  lists  possible  command
         completions.  Anywhere else TAB lists the possible
         completions of a device/filename. ]
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