Re: [Xen-devel] [PATCH RFC V3 4/5] xen, libxc: Request page fault injection via libxc

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Razvan Cojocaru writes ("[PATCH RFC V3 4/5] xen, libxc: Request page fault 
injection via libxc"):
> Added new XEN_DOMCTL_set_pagefault_info hypercall, used by libxc's
> new xc_domain_set_pagefault_info() function to set per-domain page
> fault injection information. All a call does is set per-domain info,
> and nothing actually happens until VMENTRY time, and then only if
> all conditions are met (the guest is in user mode, the set value
> matches CR3, and there are no other pending traps).
> This mechanism allows bringing in swapped-out pages for inspection.

Can this objective not be achieved without a hypervisor change, by a
suitable control interface to the paging daemon ?

Ian.

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