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[Xen-devel] [PATCH]: blktap2 : control function

To: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] [PATCH]: blktap2 : control function
From: eXeC001er <execooler@xxxxxxxxx>
Date: Fri, 21 May 2010 20:51:12 +0400
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Hi.

I tried to create small patch for blktap2 : control function:

diff -r 840f269d95fb tools/python/xen/xend/XendDomainInfo.py
--- a/tools/python/xen/xend/XendDomainInfo.py Wed May 19 22:59:52 2010 +0100
+++ b/tools/python/xen/xend/XendDomainInfo.py Fri May 21 20:17:15 2010 +0400
@@ -3292,6 +3292,7 @@
                 fn = BOOTLOADER_LOOPBACK_DEVICE
 
             try:
+                time.sleep(5)
                 blcfg = bootloader(blexec, fn, self, False,
                                    bootloader_args, kernel, ramdisk, args)
             finally:
@@ -3299,7 +3300,7 @@
                     log.info("Unmounting %s from %s." %
                              (fn, BOOTLOADER_LOOPBACK_DEVICE))
 
-                    dom0.destroyDevice('tap', BOOTLOADER_LOOPBACK_DEVICE)
+                    dom0.destroyDevice(devtype, BOOTLOADER_LOOPBACK_DEVICE)
 
             if blcfg is None:
                 msg = "Had a bootloader specified, but can't find disk"


With this patch DomU boot from VHD disk without error.

But i can not fix other bug:

if after DomU (boot disk is blktap2-type) stopped i can not start it again, because i get error "raise VmError("Device %s is already connected." % dev_str)" in "DevController.py".

but i found workaround:

stop blktap2_mount: echo 1 > /sys/class/blktap2/blktapX/remove
remove records from xenstore: 
xenstore-rm /vm/00000000-0000-0000-0000-000000000000
xenstore-write /local/domain/0/vm ""

Now i can run my DomU again.
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