mirror of
https://github.com/projectacrn/acrn-hypervisor.git
synced 2026-01-30 06:01:28 +00:00
10963b04d1
In lock instruction emulation, we use vcpu_make_request and signal_event pairs to shoot down/release other vcpus. However, vcpu_make_request is async and does not guarantee an execution of wait_event on target vcpu, and we want wait_event to be consistent with signal_event. Consider following scenarios: 1, When target vcpu's state has not yet turned to VCPU_RUNNING, vcpu_make_request on ACRN_REQUEST_SPLIT_LOCK does not make sense, and will not result in wait_event. 2, When target vcpu is already requested on ACRN_REQUEST_SPLIT_LOCK (i.e., the corresponding bit in pending_req is set) but not yet handled, the vcpu_make_request call does not result in wait_event as 1 bit is not enough to cache multiple requests. This patch tries to add checks in vcpu_kick_lock_instr_emulation and vcpu_complete_lock_instr_emulation to resolve these issues. Tracked-On: #6502 Signed-off-by: Yifan Liu <yifan1.liu@intel.com> Reviewed-by: Jason Chen CJ <jason.cj.chen@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/