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SubjectRe: [PATCH v9 00/18] HSM driver for ACRN hypervisor
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@intel.com wrote:
>> From: Shuo Liu <shuo.a.liu@intel.com>
>>
>> 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@intel.com/
>
>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

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