Re: [PATCH v4 00/17] HSM driver for ACRN hypervisor

Liu, Shuo A
2020-09-27T00:25:13Z

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On 9/22/2020 19:42, 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.
>
> The basic ARCN support was merged to upstream already.
> https://lore.kernel.org/lkml/1559108037-18813-3-git-send-email-yakui.zhao@intel.com/
>
> ChangeLog:
> v4:
> - Used acrn_dev.this_device directly for dev_*() (Reinette)
> - Removed the odd usage of {get|put}_device() on &acrn_dev->this_device (Greg)
> - Removed unused log code. (Greg)
> - Corrected the return error values. (Greg)
> - Mentioned that HSM relies hypervisor for sanity check in acrn_dev_ioctl() comments (Greg)
>
> v3:
> - Used {get|put}_device() helpers on &acrn_dev->this_device
> - Moved unused code from front patches to later ones.
> - Removed self-defined pr_fmt() and dev_fmt()
> - Provided comments for acrn_vm_list_lock.
>
> v2:
> - Removed API version related code. (Dave)
> - Replaced pr_*() by dev_*(). (Greg)
> - Used -ENOTTY as the error code of unsupported ioctl. (Greg)
>
> Shuo Liu (16):
> docs: acrn: Introduce ACRN
> x86/acrn: Introduce acrn_{setup, remove}_intr_handler()
> x86/acrn: Introduce hypercall interfaces
> virt: acrn: Introduce ACRN HSM basic driver
> virt: acrn: Introduce VM management interfaces
> virt: acrn: Introduce an ioctl to set vCPU registers state
> virt: acrn: Introduce EPT mapping management
> virt: acrn: Introduce I/O request management
> virt: acrn: Introduce PCI configuration space PIO accesses combiner
> virt: acrn: Introduce interfaces for PCI device passthrough
> virt: acrn: Introduce interrupt injection interfaces
> virt: acrn: Introduce interfaces to query C-states and P-states
> allowed by hypervisor
> virt: acrn: Introduce I/O ranges operation interfaces
> virt: acrn: Introduce ioeventfd
> virt: acrn: Introduce irqfd
> virt: acrn: Introduce an interface for Service VM to control vCPU
>
> Yin Fengwei (1):
> x86/acrn: Introduce an API to check if a VM is privileged
>
> .../userspace-api/ioctl/ioctl-number.rst | 1 +
> Documentation/virt/acrn/index.rst | 11 +
> Documentation/virt/acrn/introduction.rst | 40 ++
> Documentation/virt/acrn/io-request.rst | 97 +++
> Documentation/virt/index.rst | 1 +
> MAINTAINERS | 9 +
> arch/x86/include/asm/acrn.h | 74 ++
> arch/x86/kernel/cpu/acrn.c | 35 +-
> drivers/virt/Kconfig | 2 +
> drivers/virt/Makefile | 1 +
> drivers/virt/acrn/Kconfig | 15 +
> drivers/virt/acrn/Makefile | 3 +
> drivers/virt/acrn/acrn_drv.h | 229 +++++++
> drivers/virt/acrn/hsm.c | 437 ++++++++++++
> drivers/virt/acrn/hypercall.h | 254 +++++++
> drivers/virt/acrn/ioeventfd.c | 273 ++++++++
> drivers/virt/acrn/ioreq.c | 645 ++++++++++++++++++
> drivers/virt/acrn/irqfd.c | 235 +++++++
> drivers/virt/acrn/mm.c | 305 +++++++++
> drivers/virt/acrn/vm.c | 126 ++++
> include/uapi/linux/acrn.h | 486 +++++++++++++
> 21 files changed, 3278 insertions(+), 1 deletion(-)
> create mode 100644 Documentation/virt/acrn/index.rst
> create mode 100644 Documentation/virt/acrn/introduction.rst
> create mode 100644 Documentation/virt/acrn/io-request.rst
> create mode 100644 arch/x86/include/asm/acrn.h
> create mode 100644 drivers/virt/acrn/Kconfig
> create mode 100644 drivers/virt/acrn/Makefile
> create mode 100644 drivers/virt/acrn/acrn_drv.h
> create mode 100644 drivers/virt/acrn/hsm.c
> create mode 100644 drivers/virt/acrn/hypercall.h
> create mode 100644 drivers/virt/acrn/ioeventfd.c
> create mode 100644 drivers/virt/acrn/ioreq.c
> create mode 100644 drivers/virt/acrn/irqfd.c
> create mode 100644 drivers/virt/acrn/mm.c
> create mode 100644 drivers/virt/acrn/vm.c
> create mode 100644 include/uapi/linux/acrn.h
>
>
> base-commit: 18445bf405cb331117bc98427b1ba6f12418ad17
>