Re: [Xen-devel] [PATCH] Remove physmap page upon granttab xfer

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 29/5/08 11:02, "Isaku Yamahata" <yamahata@xxxxxxxxxxxxx> wrote:

>> After the grant transfer operation completes the page no longer belongs to
>> the backend domain. Thus, for absolute safety and isolation, the page must
>> be removed from the backend domain's IOMMU mappings before completion of the
>> grant transfer operation. Actually we should be flushing host CPU TLBs too.
> 
> Thank you for explanation.
> The patch breaks ia64 granttab xfer breakage so that it have to be fixed.
> However the operation is now obsoleted one, so I don't want to make
> big effort to fix.
> What do you think about the following patch?

How does grant transfer work on ia64? Looking at netback I don't even see
how the 'hole' left by transfer of the old page gets filled by mapping in a
new page.

 -- Keir



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