RE: [Xen-users] blktap2 not working on xen-4.0-testing?

[Dante Cinco <dantecinco@xxxxxxxxx>]

See this thread:
http://xen.markmail.org/search/?q=BLKTAPCTRL#query:BLKTAPCTRL%20order%3Adate-backward+page:1+mid:ukgam2pjnr4p625g+state:results

Dante

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Nathan
March
Sent: Thursday, July 22, 2010 3:27 PM
To: Xen Users
Subject: [Xen-users] blktap2 not working on xen-4.0-testing?

  Hi All,

According to http://wiki.xensource.com/xenwiki/XenKernelFeatures,
Jeremy's kernel should support blktap2 properly but I'm not having any
luck with it.

I've got CONFIG_XEN_BLKDEV_TAP set in the kernel (tried both built in
and a module) and dmesg shows it coming up on bootup:
[    0.566220] blktap_device_init: blktap device major 253
[    0.566574] blktap_ring_init: blktap ring major: 251

but in /dev/xen/ I have no blktap device, just these:
crw-rw----  1 root root 10, 61 Jul 22 07:11 evtchn
crw-rw----  1 root root 10, 60 Jul 22 07:11 gntdev

stracing blktapctrl shows it looking for a blktap0 in there:
[pid  6545] open("/dev/xen/blktap0", O_RDWR) = -1 ENOENT (No such file
or directory)

debug output from blktapctrl:
Jul 22 15:25:58 xen4.nmsrv.com BLKTAPCTRL[2730]: blktapctrl.c:790:
blktapctrl: v1.0.0
Jul 22 15:25:58 xen4.nmsrv.com BLKTAPCTRL[2730]: blktapctrl.c:792: Found
driver: [raw image (aio)]
Jul 22 15:25:58 xen4.nmsrv.com BLKTAPCTRL[2730]: blktapctrl.c:792: Found
driver: [raw image (sync)]
Jul 22 15:25:58 xen4.nmsrv.com BLKTAPCTRL[2730]: blktapctrl.c:792: Found
driver: [vmware image (vmdk)]
Jul 22 15:25:58 xen4.nmsrv.com BLKTAPCTRL[2730]: blktapctrl.c:792: Found
driver: [ramdisk image (ram)]
Jul 22 15:25:58 xen4.nmsrv.com BLKTAPCTRL[2730]: blktapctrl.c:792: Found
driver: [qcow disk (qcow)]
Jul 22 15:25:58 xen4.nmsrv.com BLKTAPCTRL[2730]: blktapctrl.c:792: Found
driver: [qcow2 disk (qcow2)]
Jul 22 15:25:58 xen4.nmsrv.com BLKTAPCTRL[2730]: blktapctrl_linux.c:86:
blktap0 open failed
Jul 22 15:25:58 xen4.nmsrv.com BLKTAPCTRL[2730]: blktapctrl.c:859:
couldn't open blktap interface
Jul 22 15:25:58 xen4.nmsrv.com BLKTAPCTRL[2730]: blktapctrl.c:922:
Unable to start blktapctrl

Am I missing something obvious here?

Thanks,
Nathan

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