Re: [PATCH v9 00/18] HSM driver for ACRN hypervisor

[Shuo A Liu]

On Tue  9.Feb'21 at 11:00:55 +0100, Greg Kroah-Hartman wrote:
> On Sun, Feb 07, 2021 at 11:10:22AM +0800, shuo.a.liu@xxxxxxxxx wrote:
> > From: Shuo Liu <shuo.a.liu@xxxxxxxxx>
> >
> > ACRN is a Type 1 reference hypervisor stack, running directly on the bare-metal
> > hardware, and is suitable for a variety of IoT and embedded device solutions.
> >
> > ACRN implements a hybrid VMM architecture, using a privileged Service VM. The
> > Service VM manages the system resources (CPU, memory, etc.) and I/O devices of
> > User VMs. Multiple User VMs are supported, with each of them running Linux,
> > Android OS or Windows. Both Service VM and User VMs are guest VM.
> >
> > Below figure shows the architecture.
> >
> >                 Service VM                    User VM
> >       +----------------------------+  |  +------------------+
> >       |        +--------------+    |  |  |                  |
> >       |        |ACRN userspace|    |  |  |                  |
> >       |        +--------------+    |  |  |                  |
> >       |-----------------ioctl------|  |  |                  |   ...
> >       |kernel space   +----------+ |  |  |                  |
> >       |               |   HSM    | |  |  | Drivers          |
> >       |               +----------+ |  |  |                  |
> >       +--------------------|-------+  |  +------------------+
> >   +---------------------hypercall----------------------------------------+
> >   |                       ACRN Hypervisor                                |
> >   +----------------------------------------------------------------------+
> >   |                          Hardware                                    |
> >   +----------------------------------------------------------------------+
> >
> > There is only one Service VM which could run Linux as OS.
> >
> > In a typical case, the Service VM will be auto started when ACRN Hypervisor is
> > booted. Then the ACRN userspace (an application running in Service VM) could be
> > used to start/stop User VMs by communicating with ACRN Hypervisor Service
> > Module (HSM).
> >
> > ACRN Hypervisor Service Module (HSM) is a middle layer that allows the ACRN
> > userspace and Service VM OS kernel to communicate with ACRN Hypervisor
> > and manage different User VMs. This middle layer provides the following
> > functionalities,
> >   - Issues hypercalls to the hypervisor to manage User VMs:
> >       * VM/vCPU management
> >       * Memory management
> >       * Device passthrough
> >       * Interrupts injection
> >   - I/O requests handling from User VMs.
> >   - Exports ioctl through HSM char device.
> >   - Exports function calls for other kernel modules
> >
> > ACRN is focused on embedded system. So it doesn't support some features.
> > E.g.,
> >   - ACRN doesn't support VM migration.
> >   - ACRN doesn't support vCPU migration.
> >
> > This patch set adds the HSM to the Linux kernel.
> > I also added a simple example to launch a small guest (with several instructions
> > as payload) on ACRN with demonstration ioctl usage.
> >
> > The basic ARCN support was merged to upstream already.
> > https://lore.kernel.org/lkml/1559108037-18813-3-git-send-email-yakui.zhao@xxxxxxxxx/
>
> Thanks for sticking with this, now merged to my tree.

Thanks Greg and all for reviewing this series.

A really good Spring Festival gift for ACRN. :)

Thanks
shuo