Dynamically enabling advanced programmable interrupt controller virtualization capabilities for virtual machines

A method comprising:

• determining, by a virtual machine, that an upcoming interrupt request executed by a particular virtual central processing unit (vCPU) allocated to the virtual machine will involve a virtualization exit, wherein one or more processors are mapped to one or more vCPUs allocated to the virtual machine in entries in an advanced programmable interrupt controller (APIC) table for an APIC virtualization;
• in response to determining that the upcoming interrupt request will involve the virtualization exit, accessing, by the virtual machine, a shared page comprising a copy of the APIC table and a maximum entry number for the APIC table;
• determining, by the virtual machine, that an identification number of a particular processor mapped to the particular vCPU in the copy of the APIC table is less than the maximum entry number;
• and
• in response to determining that the identification number of the particular processor is less than the maximum entry number, executing, by the one or more processors, an interrupt procedure for the interrupt request using the APIC virtualization without triggering the virtualization exit.

A non-transitory computer-readable medium comprising program code that is executable by one or more processors for causing the one or more processors to:

• determine, by a virtual machine, that an upcoming interrupt request executed by a particular virtual central processing unit (vCPU) allocated to the virtual machine will involve a virtualization exit, wherein the one or more processors are mapped to one or more vCPUs allocated to the virtual machine in entries in an advanced programmable interrupt controller (APIC) table for an APIC virtualization;
• in response to determining that the upcoming interrupt request will involve the virtualization exit, access, by the virtual machine, a shared page comprising a copy of the APIC table and a maximum entry number for the APIC table;
• determine, by the virtual machine, that an identification number of a particular processor mapped to the particular vCPU in the copy of the APIC table is less than the maximum entry number;
• and
• in response to determining that the identification number of the particular processor is less than the maximum entry number, execute an interrupt procedure for the interrupt request using the APIC virtualization without triggering the virtualization exit.