Re: VMX status report. Xen: #17630 & Xen0: #540 -- blocked

[Kevin Wolf <kwolf@suse.de>]

Ian Jackson schrieb:
 > Could those of you having this problem please try the attached patch ?
 > I have tested this one much more thoroughly :-/.

It works for me, I don't like it though. Maybe I don't understand 
correctly what the intent of the whole protocol stuff was. But if I do, 
I think you're destroying this with your patch. This is not necessarily 
bad as we don't use it anyway. But then it would be much cleaner to 
remove the functionality altogether.

To be a bit more concrete, I think the following change is wrong (even 
if there is no user anyway):

-    /* no need to test disk image formats for vvfat */
-    if (drv == &bdrv_vvfat)
+    /* no need to test disk image format if the filename told us */
+    if (drv != NULL)
          return drv;

find_protocol doesn't tell you the image format of a file, it tells you 
a protocol through which you should obtain the image. And the image you 
get could be a qcow image then. I think the reason why they are using 
bdrv functions for all file accesses is that e.g. the qcow driver could 
use the protocol driver then (if there was any protocol driver...)

Currently xend won't let you specify a filename with a protocol 
specifier anyway, so removing the whole thing is certainly an option.

Kevin