Re: [Xen-devel] can't boot from iso on cifs mount

[Vasiliy Tolstov <v.tolstov@xxxxxxxxx>]

Thanks!
I found, that now xl tries to open iso with O_DIRECT flag.
open("/var/storage/iso/SW_DVD5_Windows_Svr_DC_EE_SE_Web_2008_R2_64Bit_Russian_w_SP1_MLF_X17-22616_vase.iso",
O_RDONLY|O_DIRECT) = -1 EINVAL (Invalid argument)
write(2, "qemu: could not open vbd '/local"..., 217) = 217

my xen version is 4.1.3


2013/1/21 Ian Campbell <Ian.Campbell@xxxxxxxxxx>:
> On Sat, 2013-01-19 at 11:23 +0000, Vasiliy Tolstov wrote:
>> After switching from xm to xl
>
> Which version of Xen?
>
>>  i found that all my windows hvm domU
>> can't boot from iso. domU can't boot is iso on cifs mount point. If
>> that iso move from cifs to ramdisk - all work's fine.
>>
>> cifs mount:
>> //cc/public on /var/storage type cifs
>> (rw,relatime,vers=1.0,sec=ntlm,cache=none,unc=\\cc\public,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.25.254,unix,posixpaths,serverino,acl,rsize=1048576,wsize=65536,actimeo=1)
>>
>> xl messages contains:
>> Using file /dev/disk/vbd/21-822 in read-write mode
>> Strip off blktap sub-type prefix to
>> /var/storage/iso/SW_DVD5_Windows_Svr_DC_EE_SE_Web_2008_R2_64Bit_Russian_w_SP1_MLF_X17-22616_vase.iso
>> (drv 'aio')
>> Using file 
>> /var/storage/iso/SW_DVD5_Windows_Svr_DC_EE_SE_Web_2008_R2_64Bit_Russian_w_SP1_MLF_X17-22616_vase.iso
>> in read-only mode
>> qemu: could not open vbd '/local/domain/0/backend/qdisk/162/5632/mode'
>> or hard disk image
>> '/var/storage/iso/SW_DVD5_Windows_Svr_DC_EE_SE_Web_2008_R2_64Bit_Ru
>> ssian_w_SP1_MLF_X17-22616_vase.iso' (drv 'aio' format 'raw')
>>
>> domain started with xl create /etc/empty \
>> -d \
>> name="21-10824" \
>> kernel="/usr/lib/xen/boot/hvmloader" \
>> builder="hvm" \
>> memory=768 \
>> vcpus=4 \
>> vif=["mac=00:16:3e:00:1a:e4,ip=62.76.190.208,type=paravirtualised"]
>> disk=["phy:/dev/disk/vbd/21-822,hda,w",
>> "file:/var/storage/iso/SW_DVD5_Windows_Svr_DC_EE_SE_Web_2008_R2_64Bit_Russian_w_SP1_MLF_X17-22616_vase.iso,hdc:cdrom,r",
>> "file:/var/storage/iso/winpe_amd64.iso,hdb,r,devtype=cdrom"] \
>
> If you remove the first CD-ROM entry does the second one work? I expect
> not (they both parse to the same sort of thing) and it is just failing
> at the first and not even trying the second.
>
> Can you read the .iso manually (e.g. using md5sum or od or something) as
> root on the dom0? (I'm wondering if there is some CIFS equivalent of
> root_squash)
>
> Do you get anything in /var/log/xen/qemu-dm* in addition to the xl logs?
>
> One approach to debugging this might be to use
>         device_model_override="/path/to/my-qemu"
> where my-qemu is a script which runs
>         strace -o /tmp/qemu.strace -fff /usr/lib/xen/bin/qemu-dm $@
>
> The strace might tell you a little bit more about how/why it is failing
> to open the file.
>
> Ian.
>



-- 
Vasiliy Tolstov,
Clodo.ru
e-mail: v.tolstov@xxxxxxxxx
jabber: vase@xxxxxxxxx

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