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This patch implements the VMREAD and VMWRITE instructions. When L1 guest is running with an active VMCS12, the “VMCS shadowing” VM-execution control is always set to 1 in VMCS01. Thus the possible behavior of VMREAD or VMWRITE from L1 could be: - It causes a VM exit to L0 if the bit corresponds to the target VMCS field in the VMREAD bitmap or VMWRITE bitmap is set to 1. - It accesses the VMCS referenced by VMCS01 link pointer (VMCS02 in our case) if the above mentioned bit is set to 0. This patch handles the VMREAD and VMWRITE VM exits in this way: - on VMWRITE, it writes the desired VMCS value to the respective field in the cached VMCS12. For VMCS fields that need to be synced to VMCS02, sets the corresponding dirty flag. - on VMREAD, it reads the desired VMCS value from the cached VMCS12. Tracked-On: #5923 Signed-off-by: Alex Merritt <alex.merritt@intel.com> Signed-off-by: Sainath Grandhi <sainath.grandhi@intel.com> Signed-off-by: Zide Chen <zide.chen@intel.com> Acked-by: Eddie Dong <eddie.dong@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/