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[Xen-devel] How to turn off persistent grant in xen

I want to disable persistent grant in xen. I tried to use xenbus to disable it. What I did is modifying this line in drivers/block/xenblkback/xenbus.c:

791 err = xenbus_printf(xbt, dev->nodename, "feature-persistent", "%u", 1);

and put this

791 err = xenbus_printf(xbt, dev->nodename, "feature-persistent", "%u", 0);

but the problem is my domain crash.

I think it is not the only thing to do in order to disable persistent grant.
Please can you help me.

Thank you


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