Re: [PATCH v3 kvm/queue 11/16] KVM: Add kvm_map_gfn_range

[Chao Peng]

On Thu, Dec 23, 2021 at 06:06:19PM +0000, Sean Christopherson wrote:
> On Thu, Dec 23, 2021, Chao Peng wrote:
> > This new function establishes the mapping in KVM page tables for a
> > given gfn range. It can be used in the memory fallocate callback for
> > memfd based memory to establish the mapping for KVM secondary MMU when
> > the pages are allocated in the memory backend.
> 
> NAK, under no circumstance should KVM install SPTEs in response to allocating
> memory in a file.   The correct thing to do is to invalidate the gfn range
> associated with the newly mapped range, i.e. wipe out any shared SPTEs associated
> with the memslot.

Right, thanks.