| Subject | Re: [Xen-devel] [PATCH RFC 00/39] x86/KVM: Xen HVM guest support | From | Ankur Arora <> | Date | Wed, 20 Feb 2019 16:31:53 -0800 |
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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.
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