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