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

[HANNAS YAYA Issa <issa.hannasyaya@xxxxxxxxxxx>]

Got it. Thank you

Hannas

On Tue, 19 May 2015 17:41:41 +0200, Roger Pau Monnà wrote:
> El 19/05/15 a les 16.17, HANNAS YAYA Issa ha escrit:
> > Hi
> > 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.
> You only disabled it in the backend, so blkfront is announcing
> persistent grant support while blkback is not. This means that 
> blkback
> will use persistent grants (because it sees the frontend supports 
> them),
> but blkfront will not.
>
> You also need to disable the feature announcement from the frontend,
> just grep for feature-persistent in xen-blkfront.c.
>
> Roger.

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