recognize a pending virtual interrupt while emulating halt instruction

[rgrimes]

sys/amd64/vmm/intel/vmx.c

3190

Do we need to do some .h work, seems you use this magic constant 0xf0 twice here, for me that means it probably should be a #define that is descriptive of what bits are being masked?

[tychon]

Replace magic constants with #define, within the function, to clarify usage.