Guest/hypervisor interrupt coalescing for storage adapter virtual function in guest passthrough mode

A computer-readable storage medium including instructions that, when executed on a computer processor, causes the computer processor to coalesce input/output (IO) interrupts to a virtual machine (VM) running on a host computer, by performing the steps of:

• receiving, at a virtualization layer of the host computer that supports execution of the VM, an IO interrupt in response to a completion of an IO request of the VM, wherein a transmission of the IO request by the VM to an IO device bypasses the virtualization layer;
• determining, at the virtualization layer, whether the VM has responded to a most recently delivered IO interrupt to the VM by the virtualization layer;
• and
• dropping, by the virtualization layer, the IO interrupt if the VM has not responded to the most recently delivered IO interrupt, thereby failing to deliver the IO interrupt to the VM.

A host computer configured to coalesce input/output (IO) interrupts to a virtual machine (VM) running on the host computer, the host computer comprising a processor configured to perform the steps of

• receiving, at a virtualization layer of the host computer that supports execution of the VM, an IO interrupt in response to a completion of an IO request of the VM, wherein a transmission of the IO request by the VM to an IO device bypasses the virtualization layer;
• determining, at the virtualization layer, whether the VM has responded to a most recently delivered IO interrupt to the VM by the virtualization layer;
• and
• dropping, by the virtualization layer, the IO interrupt if the VM has not responded to the most recently delivered IO interrupt, thereby failing to deliver the IO interrupt to the VM.