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Virtio legacy device (ver < 1.0) uses a single PIO for all virtqueues. Notifications from different virtqueues are implemented by writing virtqueue index to the PIO. Writing different values to the same addr needs to be mapped to different eventfds by asyncio. This is called data match feature of asyncio. v3 -> v4: * Update the definition of `struct asyncio_desc` Use `struct acrn_asyncio_info` inside it, instaed of defining the duplicated fileds. * Update `add_asyncio` to use `memcpy_s` rather than assigning all the fields using 5 assignment statements. * Update `asyncio_is_conflict` for coding style 120-character line is sufficient to write all conditions. * Update the checks related to `wildcard` Because we require every conditional clause to have a Boolean type in the coding guideline. v2 -> v3: No change v1 -> v2: No change Tracked-On: #8612 Signed-off-by: Jian Jun Chen <jian.jun.chen@intel.com> Signed-off-by: Shiqing Gao <shiqing.gao@intel.com> Acked-by: Wang, Yu1 <yu1.wang@intel.com>
ACRN Hypervisor ############### The open source `Project ACRN`_ defines a device hypervisor reference stack and an architecture for running multiple software subsystems, managed securely, on a consolidated system by means of a virtual machine manager. It also defines a reference framework implementation for virtual device emulation, called the "ACRN Device Model". The ACRN Hypervisor 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. The ACRN hypervisor addresses the gap that currently exists between datacenter hypervisors, and hard partitioning hypervisors. The ACRN hypervisor architecture partitions the system into different functional domains, with carefully selected guest OS sharing optimizations for IoT and embedded devices. You can find out more about Project ACRN on the `Project ACRN documentation`_ website. .. _`Project ACRN`: https://projectacrn.org .. _`ACRN Hypervisor`: https://github.com/projectacrn/acrn-hypervisor .. _`Project ACRN documentation`: https://projectacrn.github.io/