Hi, A snapshot of Avi's tree as of today breaks on ia64. Looks like it is the recent MSI support that caused this. Sheng Yang, please make sure to test on non x86 when you implement things like these that clearly will only build on x86. This patch boots on ia64 for me. Thanks, Jes CC arch/ia64/kvm/../../../virt/kvm/irq_comm.o arch/ia64/kvm/../../../virt/kvm/irq_comm.c: In function 'kvm_set_msi': arch/ia64/kvm/../../../virt/kvm/irq_comm.c:54: error: 'MSI_ADDR_DEST_ID_MASK' undeclared (first use in this function) arch/ia64/kvm/../../../virt/kvm/irq_comm.c:54: error: (Each undeclared identifier is reported only once arch/ia64/kvm/../../../virt/kvm/irq_comm.c:54: error: for each function it appears in.) arch/ia64/kvm/../../../virt/kvm/irq_comm.c:55: error: 'MSI_ADDR_DEST_ID_SHIFT' undeclared (first use in this function) arch/ia64/kvm/../../../virt/kvm/irq_comm.c:56: error: 'MSI_DATA_VECTOR_MASK' undeclared (first use in this function) arch/ia64/kvm/../../../virt/kvm/irq_comm.c:57: error: 'MSI_DATA_VECTOR_SHIFT' undeclared (first use in this function) arch/ia64/kvm/../../../virt/kvm/irq_comm.c:58: error: 'MSI_ADDR_DEST_MODE_SHIFT' undeclared (first use in this function) arch/ia64/kvm/../../../virt/kvm/irq_comm.c:60: error: 'MSI_DATA_TRIGGER_SHIFT' undeclared (first use in this function) arch/ia64/kvm/../../../virt/kvm/irq_comm.c:62: error: 'MSI_DATA_DELIVERY_MODE_SHIFT' undeclared (first use in this function) arch/ia64/kvm/../../../virt/kvm/irq_comm.c:76: error: implicit declaration of function 'kvm_apic_set_irq' make[1]: *** [arch/ia64/kvm/../../../virt/kvm/irq_comm.o] Error 1 make: *** [arch/ia64/kvm] Error 2 commit e4caaecb2fa206ee513756fe17593d7b3334be7b Author: Sheng Yang Date: Tue Feb 10 13:57:06 2009 +0800 KVM: Use irq routing API for MSI Merge MSI userspace interface with IRQ routing table. Notice the API have been changed, and using IRQ routing table would be the only interface kvm-userspace supported. Signed-off-by: Sheng Yang Signed-off-by: Avi Kivity