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HV passes the return value of vmcall by register RAX unconditionally. However, if the vmcall is undefined for a guest, RAX value of guest vcpu should not be changed. According to SDM Vol. 3C 30-9, VMCALL is allowed from any CPL in guest. VMCALL is NOT allowed from CPL > 0 in vmx root mode. ACRN hypervisor doesn't call VMCALL in vmx root mode, though. In current code, ACRN also deny VMCALL from CPL > 0 in guest. So for this case, #GP will not be injected, instead, modify the RAX to notify the return value. Tracked-On: #2405 Signed-off-by: Binbin Wu <binbin.wu@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/