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Re: [Xen-devel] [PATCH RFC] xen/grant_table: introduce GNTTABOP_unmap_and_duplicate

On 31/07/13 18:05, Roger Pau Monne wrote:
> GNTTABOP_unmap_and_replace has two issues:
> - it unconditionally replaces the mapping passed in new_addr with 0;
> - it doesn't support GNTMAP_contains_pte mappings on x86, returning a
> general error instead of some form of ENOSYS.
> Introduce a new operation called GNTTABOP_unmap_and_duplicate that
> behaves like GNTTABOP_unmap_and_replace without zeroing the mapping
> passed in new_addr. Also return GNTST_enosys instead of
> GNTST_general_error if GNTMAP_contains_pte is specified.
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> Signed-off-by: Roger Pau Monnà <roger.pau@xxxxxxxxxx>
> Cc: Tim Deegan <tim@xxxxxxx>
> Cc: Jan Beulich <jbeulich@xxxxxxxx>
> Cc: Keir Fraser <keir@xxxxxxx>

Any comments on this one or should I just drop the RFC and resend?

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