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Re: [Xen-devel] [PATCH v12 05/11] x86/mm: add HYPERVISOR_memory_op to acquire guest resources
- To: "Julien Grall" <julien.grall@xxxxxxxxxx>
- From: "Jan Beulich" <JBeulich@xxxxxxxx>
- Date: Fri, 20 Oct 2017 00:17:27 -0600
- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>, "Tim\(Xen.org\)" <tim@xxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Paul Durrant <Paul.Durrant@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxx>, Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>, Roger PauMonne <roger.pau@xxxxxxxxxx>
- Delivery-date: Fri, 20 Oct 2017 06:17:35 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
>>> On 19.10.17 at 18:06, <julien.grall@xxxxxxxxxx> wrote:
> On 19/10/17 16:47, Jan Beulich wrote:
>> I don't understand: The refcounting is to be done by ARM-specific
>> code anyway, i.e. by the implementation of set_foreign_p2m_entry(),
>> not its caller. At least that's what I would have expected.
>
> I thought I said it before, but it looks like not. Assuming the MFN is
> always baked by a domain, the prototype would likely need to be extended
> and take the foreign domain.
>
> If it is not the case, we would need to find another way to do refcounting.
Well, adding another parameter can't be that bad of a problem to solve.
Jan
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