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

[Joao Martins]

On 2/20/19 11:39 PM, Marek Marczykowski-GÃrecki 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
> arbitrary write access to guest memory. But grant tables provide enough
> abstraction to do that safely.
> 
In this series not yet. Here we are trying to resemble how KVM drives its kernel
PV backends (i.e. vhost virtio).

The domU grant {un,}mapping could be added complementary. The main difference
between domU gntmap vs shim gntmap is that the former maps/unmaps the  guest
page on the backend. Most of it is common code I think.

	Joao