Re: [Xen-devel] [Xen-users] ARM: "xen_add_mach_to_phys_entry: cannot add ... already exists and panics"

[David Vrabel <david.vrabel@xxxxxxxxxx>]

On 03/07/14 18:47, Stefano Stabellini wrote:
> 
> At the moment I would like a way to disable grant mappings and go back
> to grant copies on demand. Maybe we could have a feature flag to change
> the behaviour of the network backend?

You must fix the ARM code to handle this properly.

blkback also uses grant maps and depending on the frontend blkback may
grant map the same machine frame multiple time.  We have see frontends
that send such requests.

I can't remember how the ARM code works.  Where is the problematic m2p
lookup?  Perhaps this could be avoided for foreign frames?

David

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