KVM_PRIO_SHIFT
#define KVM_PRIO_STEPS (1 << KVM_PRIO_SHIFT) /* 8 */
#define CPU_PRIO_MASK (LOWEST_PRIO << KVM_PRIO_SHIFT) /* 0xf8 */
#define IRQ_DEFAULT_PRIO_REG (IRQ_DEFAULT_PRIO << KVM_PRIO_SHIFT) /* 0xf0 */