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Re: [Xen-devel] [PATCH RFC 00/39] x86/KVM: Xen HVM guest support

On 2/20/19 3:39 PM, Marek Marczykowski-Górecki wrote:
On Wed, Feb 20, 2019 at 08:15:30PM +0000, Joao Martins wrote:
  2. PV Driver support (patches 17 - 39)

  We start by redirecting hypercalls from the backend to routines
  which emulate the behaviour that PV backends expect i.e. grant
  table and interdomain events. Next, we add support for late
  initialization of xenbus, followed by implementing
  frontend/backend communication mechanisms (i.e. grant tables and
  interdomain event channels). Finally, introduce xen-shim.ko,
  which will setup a limited Xen environment. This uses the added
  functionality of Xen specific shared memory (grant tables) and
  notifications (event channels).

Does it mean backends could be run in another guest, similarly as on
real Xen? AFAIK virtio doesn't allow that as virtio backends need
I'm afraid not. For now grant operations (map/unmap) can only be done
by backends to the local KVM instance.


arbitrary write access to guest memory. But grant tables provide enough
abstraction to do that safely.

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