This is a long known issue.
If copy_to/from_user fails, the hypercall fails.
Do we have any plan to handle this issue?
Thanks,
-Anthony
>-----Original Message-----
>From: xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx
>[mailto:xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Isaku
>Yamahata
>Sent: 2006?4?20? 18:35
>To: Tian, Kevin
>Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>Subject: Re: [Xen-ia64-devel] "Bad address" when "xm create"
>
>
>Hi Kevin.
>
>On Thu, Apr 20, 2006 at 05:22:17PM +0800, Tian, Kevin wrote:
>> Only observed once that "Bad address" returned when "xm
>> create" and thus failed to create domU on top of latest p2m tree.
>> However I can't reproduce it and just reported here for you
>> reference. Possibly the cause is from hypercall parameter copy,
>> but not sure. Next time if I see it, I'll try to capture more info.
>
>Thank you for your report.
>Is there any message in xend.log?
>
>I found "bad address" from the xend.log of my test environtment.
>I don't remember it clearly, but I guess this was caused by hypercall
>parameter copy.
>xc_linux_build() has work around, but xc_memory_op() doesn't
>so that xc_memory_op() might result in EFAULT.
>
>
>xc_domain_memory_increase_reservation()
> => xc_memory_op(xc_handle, XENMEM_increase_reservation, &reservation);
>
>[2006-03-23 15:05:04 xend.XendDomainInfo] DEBUG (XendDomainInfo:177)
>XendDomainInfo.create(['vm', ['name', 'dom0vp-domU'], ['memory', '128'],
>['vcpus', '1'], ['image', ['linux', ['kernel',
>'/home/yamahata/xen/hg/ia64/xen-config/dom0vp/domU/vmlinux-xenU'],
>['ramdisk', '/boot/efi/efi/people/yamahata/cross3/initrd-2.6.12'], ['root',
>'/dev/sda6 ro'], ['args', '4']]], ['device', ['vbd', ['uname', 'phy:sda6'],
>['dev', 'sda6'], ['mode', 'w']]], ['
>device', ['vif', ['bridge', 'xenbr0']]]])
>[2006-03-23 15:05:04 xend.XendDomainInfo] DEBUG (XendDomainInfo:283)
>parseConfig: config is ['vm', ['name', 'dom0vp-domU'], ['memory', '128'],
>['vcpus', '1'], ['image', ['linux', ['kernel',
>'/home/yamahata/xen/hg/ia64/xen-config/dom0vp/domU/vmlinux-xenU'],
>['ramdisk', '/boot/efi/efi/people/yamah
>ata/cross3/initrd-2.6.12'], ['root', '/dev/sda6 ro'], ['args', '4']]],
>['device', ['vbd', ['uname', 'phy:sda6'], ['dev', 'sda6'], ['mode', 'w']]],
>['device', ['vif', ['bridge', 'xenbr0']]]]
>[2006-03-23 15:05:04 xend.XendDomainInfo] DEBUG (XendDomainInfo:379)
>parseConfig: result is {'ssidref': None, 'uuid': None, 'on_crash': None,
>'on_reboot': None, 'image': ['linux', ['kernel',
>'/home/yamahata/xen/hg/ia64/xen-config/dom0vp/domU/vmlinux-xenU'],
>['ramdisk', '/boot/efi/efi/people/yama
>hata/cross3/initrd-2.6.12'], ['root', '/dev/sda6 ro'], ['args', '4']],
>'on_poweroff': None, 'cpus': None, 'name': 'dom0vp-domU', 'backend': [],
>'vcpus': 1, 'cpu_weight': None, 'vcpu_avail': None, 'memory': 128, 'device':
>[('vbd', ['vbd', ['uname', 'phy:sda6'], ['dev', 'sda6'], ['mode', 'w']]), (
>'vif', ['vif', ['bridge', 'xenbr0']])], 'bootloader': None, 'cpu': None,
>'maxmem': None}
>[2006-03-23 15:05:04 xend.XendDomainInfo] DEBUG (XendDomainInfo:1163)
>XendDomainInfo.construct: None 0
>[2006-03-23 15:05:04 xend.XendDomainInfo] DEBUG (XendDomainInfo:1195)
>XendDomainInfo.initDomain: 1 1.0
>[2006-03-23 15:05:04 xend] DEBUG (balloon:126) Balloon: free 1777; need 129;
>done.
>[2006-03-23 15:05:04 xend.XendDomainInfo] ERROR (XendDomainInfo:189) Domain
>construction failed
>Traceback (most recent call last):
> File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 182, in create
> vm.initDomain()
> File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 1220, in initDomain
> xc.domain_memory_increase_reservation(self.domid, m, 0, 0)
>error: (14, 'Bad address')
>[2006-03-23 15:05:04 xend.XendDomainInfo] DEBUG (XendDomainInfo:1321)
>XendDomainInfo.destroy: domid=1
>[2006-03-23 15:05:04 xend.XendDomainInfo] DEBUG (XendDomainInfo:1329)
>XendDomainInfo.destroyDomain(1)
>[2006-03-23 15:05:04 xend] ERROR (SrvBase:87) Request create failed.
>Traceback (most recent call last):
> File "/usr/lib/python/xen/web/SrvBase.py", line 85, in perform
> return op_method(op, req)
> File "/usr/lib/python/xen/xend/server/SrvDomainDir.py", line 82, in
>op_create
> raise XendError("Error creating domain: " + str(ex))
>XendError: Error creating domain: (14, 'Bad address')
>
>--
>yamahata
>
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