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730f11e4c9
Initialize the VM's time_delta to provide a consistent time offset for guests, and properly initialize vcpu timer-related CSRs (htimedelta and vstimecmp) to enable guest timer virtualization. Changes: - Add time_delta field to vm_arch structure to track VM time offset - Initialize time_delta to -cpu_ticks() at VM creation, making guest time start from 0 - Save/restore htimedelta CSR in vcpu load/unload paths - Initialize vcpu's htimedelta from VM's time_delta - Reset vstimecmp to invalid value (0xffffffffffffffff) on vcpu reset - Add SSTC (Sstc extension) capability check Tracked-On: #8851 Signed-off-by: Haoyu Tang <haoyu.tang@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/