Direct mapping of msi-x registers using paravirtualized memory monitoring

A computer-implemented method, comprising:

• transmitting, from a guest to a hypervisor of a host, a request to map an address range of memory of the guest to a message signaled-interrupt capability table associated with a device;
• detecting, by the guest, a mapping by the hypervisor of the message signaled-interrupt capability table from a message signaled-interrupt capability register of a programmable interrupt controller associated with the host to the address range of memory of the guest;
• and
• programming the device by the guest with the message-signaled interrupt configuration located in the address range of memory of the guest.

A computer system comprising:

• a memory;
• a host CPU, coupled to the memory;
• and
• a hypervisor hosted by the computer system, having access to the memory and use of the host CPU, the hypervisor to:
• detect, by the hypervisor, a request by a guest to map an address range of memory of the guest to a message signaled-interrupt capability table associated with a device;
• map, by the hypervisor, the message signaled-interrupt capability table from a message signaled-interrupt capability register of a programmable interrupt controller associated with the host to the address range of memory of the guest.