Re: [Xen-devel] [PATCH 4/4] AMD IOMMU: untie remap and vector maps

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Tue, Mar 26, 2013 at 9:05 AM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
> With the specific IRTEs used for an interrupt no longer depending on
> the vector, there's no need to tie the remap sharing model to the
> vector sharing one.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Unfortunately I'm having a bit of trouble "paging in" the technical
details of why this change was necessary.  I thought that the
limitation had to do with the remapping table itself.  Are you saying
that if interrupt X maps to pcpu 0 vector 5, and interrupt Y maps to
pcpu 2 vector 5, that even if X and Y are in the same table, they will
still go to the right place?  Could you give me a brief explanation of
why that is?  (I don't know what IRTE is, and Google is not helpful.)

 -George

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