Re: [Xen-devel] [PATCH v9 3/5] xen/mem_sharing: VM forking

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Fri, Feb 21, 2020 at 10:49:21AM -0800, Tamas K Lengyel wrote:
> VM forking is the process of creating a domain with an empty memory space and 
> a
> parent domain specified from which to populate the memory when necessary. For
> the new domain to be functional the VM state is copied over as part of the 
> fork
> operation (HVM params, hap allocation, etc).

I've just realized that I'm not sure how are special pages handled,
what happens to the xenstore, console, shared info pages, or the
vcpu info pages if the parent has those registered?

Also, what happens to pages that are being used for DMA with emulated
devices? Will QEMU foreign mappings also trigger the populate on
demand routine, so that external emulators can access those?

Thanks, Roger.

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