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Created attachment 1109178 [details] screenshot Description of problem: When boot guest with "-nodefaults" and without "-usb",the guest cannot boot up successful and will stoped at: ... Scanning USB No console specified and no default found,creating dev-null Version-Release number of selected component (if applicable): Host: kernel-3.10.0-327.el7.ppc64le qemu-kvm-rhev-2.3.0-31.el7_2.5.ppc64le SLOF-20150313-5.gitc89b0df.el7.noarch Guest: RHEL-7.2-20151030.0-Server-ppc64-dvd1.iso How reproducible: 100% Steps to Reproduce: 1.Boot up guest with "nodefaults" and with "-usb" : # /usr/libexec/qemu-kvm -name virtio-input -machine pseries -m 8G -smp 4 -uuid 8aeab7e2-f341-4f8c-80e8-59e2968d85c2 -realtime mlock=off -monitor stdio -rtc base=utc -msg timestamp=on -vga std -qmp tcp:0:4666,server,nowait -netdev tap,id=hostnet1,script=/etc/qemu-ifup,vhost=on -device virtio-net-pci,netdev=hostnet1,id=net1,mac=00:54:5a:52:5f:5c -vnc :10 -device spapr-vscsi,id=scsi0,reg=0x6000 -drive file=RHEL-7.2-20151030.0-Server-ppc64le.qcow2,format=qcow2,if=none,id=drive-scsi0-0-0-0,cache=none -device scsi-hd,bus=scsi0.0,drive=drive-scsi0-0-0-0,bootindex=1,id=scsi0-0-0-0 -drive file=RHEL-7.2-20151030.0-Server-ppc64-dvd1.iso,format=raw,if=none,id=drive-scsi1,cache=none -device scsi-cd,bus=scsi0.0,drive=drive-scsi1,bootindex=2,id=scsi1 -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x7 -chardev socket,path=/tmp/qga.sock,server,nowait,id=qga0 -device virtserialport,bus=virtio-serial0.0,chardev=qga0,id=qemu-ga0,name=org.qemu.guest_agent.0 -nodefaults -usb 2.Boot up guest with "-nodefaults" and without "-usb": # /usr/libexec/qemu-kvm -name virtio-input -machine pseries -m 8G -smp 4 -uuid 8aeab7e2-f341-4f8c-80e8-59e2968d85c2 -realtime mlock=off -monitor stdio -rtc base=utc -msg timestamp=on -vga std -qmp tcp:0:4666,server,nowait -netdev tap,id=hostnet1,script=/etc/qemu-ifup,vhost=on -device virtio-net-pci,netdev=hostnet1,id=net1,mac=00:54:5a:52:5f:5c -vnc :10 -device spapr-vscsi,id=scsi0,reg=0x6000 -drive file=RHEL-7.2-20151030.0-Server-ppc64le.qcow2,format=qcow2,if=none,id=drive-scsi0-0-0-0,cache=none -device scsi-hd,bus=scsi0.0,drive=drive-scsi0-0-0-0,bootindex=1,id=scsi0-0-0-0 -drive file=RHEL-7.2-20151030.0-Server-ppc64-dvd1.iso,format=raw,if=none,id=drive-scsi1,cache=none -device scsi-cd,bus=scsi0.0,drive=drive-scsi1,bootindex=2,id=scsi1 -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x7 -chardev socket,path=/tmp/qga.sock,server,nowait,id=qga0 -device virtserialport,bus=virtio-serial0.0,chardev=qga0,id=qemu-ga0,name=org.qemu.guest_agent.0 -nodefaults 3.Boot up guest without "-nodefaults" and without "-usb" # /usr/libexec/qemu-kvm -name virtio-input -machine pseries -m 8G -smp 4 -uuid 8aeab7e2-f341-4f8c-80e8-59e2968d85c2 -realtime mlock=off -monitor stdio -rtc base=utc -msg timestamp=on -vga std -qmp tcp:0:4666,server,nowait -netdev tap,id=hostnet1,script=/etc/qemu-ifup,vhost=on -device virtio-net-pci,netdev=hostnet1,id=net1,mac=00:54:5a:52:5f:5c -vnc :10 -device spapr-vscsi,id=scsi0,reg=0x6000 -drive file=RHEL-7.2-20151030.0-Server-ppc64le.qcow2,format=qcow2,if=none,id=drive-scsi0-0-0-0,cache=none -device scsi-hd,bus=scsi0.0,drive=drive-scsi0-0-0-0,bootindex=1,id=scsi0-0-0-0 -drive file=RHEL-7.2-20151030.0-Server-ppc64-dvd1.iso,format=raw,if=none,id=drive-scsi1,cache=none -device scsi-cd,bus=scsi0.0,drive=drive-scsi1,bootindex=2,id=scsi1 -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x7 -chardev socket,path=/tmp/qga.sock,server,nowait,id=qga0 -device virtserialport,bus=virtio-serial0.0,chardev=qga0,id=qemu-ga0,name=org.qemu.guest_agent.0 Actual results: After step 1,the guest can boot up successful After step 2,the guest cannot boot up succesful and will stoped at SLOF: Scanning USB No console specified and no default found,creating dev-null After step 3,the guest can boot up successful Expected results: All the senarios,the guest should boot up successful. Additional info:
Test on x86_64 host,not hit this issue.
As the error from SLOF suggests the machine has no console. With -nodefaults the user is expected to specify enough devices to form a working system. There are two ways to do this for a papr guest: 1) Specify both a graphics device (VGA) and an input device (USB or, in future, virtio-input). 2) Specify a hypervisor console with -device spapr-vty (neither a graphics nor USB device is necessary). Since papr guests are intended for server usage, it's expected that (2) will be the usual approach. We can't reasonably include a console with -nodefaults, because neither of these options should be treated as an "always present" device.