Reducing IPI overhead with CPU overcommit support via IPI broadcast

A system comprising:

• a memory;
• and
• a processing device operatively coupled to the memory, the processing device to cause a hypervisor of a host computer system to:
• detect an inter-processor interrupt (IPI) associated with a first virtual processor of a plurality of virtual processors of a virtual machine running on the host computer system;
• send the IPI to the plurality of virtual processors;
• determine whether at least one virtual processor of the plurality of virtual processors is in an active state;
• responsive to determining that at least one virtual processor of the plurality of virtual processors is in the active state, cause the plurality of virtual processors to stay in a guest execution mode;
• determine whether all virtual processors of the plurality of virtual processors entered an idle state;
• and
• responsive to determining that all virtual processors of the plurality of virtual processors entered the idle state, cause the plurality of virtual processors to exit the guest execution mode.

A non-transitory computer-readable storage medium comprising executable instructions that, when executed by a processing device, cause the processing device to:

• receive, from an APIC bus of a host computer system, an IPI associated with a virtual processor of a plurality of virtual processors of a virtual machine running on the host computer system;
• broadcast the IPI to the plurality of virtual processors;
• determining whether at least one virtual processor of the plurality of virtual processors is in an active state;
• responsive to determining that at least one virtual processor of the plurality of virtual processors is in the active state, cause the plurality of virtual processors to stay in a guest execution mode;
• determining whether all virtual processors of the plurality of virtual processors entered an idle state;
• and
• responsive to determining that all virtual processors of the plurality of virtual processors entered the idle state, cause the plurality of virtual processors to exit the guest execution mode.