[Xen-devel] Re: [PATCH] Support swap a page from user space tools -- Was RE: [RFC][PATCH] Basic support for page offline

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 19/03/2009 13:01, "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx> wrote:

> Instead of add a new mmu_*op, I try to change the  MMU_NORMAL_PT_UPDATE to
> support update foreign page table. There will be some restirction for it,
> including the pagetable and the new mfn pointed should be owned by same
> domain, and the domain should be suspeneded already. The
> update_foregin_pt.patch is for this. I'm not sure if this method is feasible.

I'll need to look in more detail, but yes it does appear this approach can
work. This is probably the easiest way to go in that case.

> The exchange_page.patch is to replace a mfn with a new one. Although there is
> already a memory_exchange hypercall, but that hypercall will not accept new
> page, add that support will break current ABI. Also it does not support
> foreign domain. This function add those support

Well, why is the existing hypercall not okay by itself? Why can you not take
an arbitrary new mfn and you feel you have to specify it from the tools
instead?

 -- Keir



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