While S390x was one of the first targets that were supported by KVM it always lacked qemu system emulation support.
In order to change that sad fact, I figured I'd just take on the task myself, taking kuli (http://www.ibm.com/developerworks/linux/linux390/kuli.html), Documentation/s390/kvm.txt and lguest as starting points to write a clean, qemu'ish S390x Virtio machine emulation. So now you can run Linux VMs on Linux on z/VM on LPAR on zSeries! This is the resulting code. Please comment on things you like and also on the ones you don't :-). The patchset is based on Uli's S390x userspace emulation patches. There's not really that much shared functionality, but I didn't want to reimplement the configure wheels. So make sure to have his patches applied first. Please only run S390x system virtualization using io threads. S390x has very few intercepts and even less that actually reach userspace. So you'll end up with a non-responsive VM without a dedicated IO thread. Use: $ ./configure --target-list=s390x-softmmu --enable-io-thread Currently only -kernel, -initrd and friends work. Booting from a real dasd device is not supported. Also to actually run this code you need a patch for an ugly bug in the kernel module: http://alex.csgraf.de/psw.patch I verified that the userspace actually works on a 2.6.27 (SLES11) kernel, so if it doesn't work on current git, please tell me! I'm too afraid that I might end up in a 3270 terminal to update the kernel on my z/VM instance :-). Alexander Graf (9): Export function for VA defined ram allocation Add KVM support for S390x Add support for S390x system emulation Add S390x virtio machine bus Add S390x virtio machine description S390 GDB stub Implement early printk in virtio-console Set default console to virtio on S390x Move mp_state to CPU_COMMON Makefile.target | 2 + configure | 4 +- cpu-common.h | 1 + cpu-defs.h | 1 + exec.c | 15 ++- gdbstub.c | 52 ++++++ hw/s390-virtio-bus.c | 350 +++++++++++++++++++++++++++++++++++ hw/s390-virtio-bus.h | 64 +++++++ hw/s390-virtio.c | 244 ++++++++++++++++++++++++ hw/virtio-console.c | 7 + hw/virtio-console.h | 2 + target-i386/cpu.h | 1 - target-s390x/cpu.h | 86 +++++++++- target-s390x/exec.h | 5 + target-s390x/helper.c | 26 +++- target-s390x/kvm.c | 457 ++++++++++++++++++++++++++++++++++++++++++++++ target-s390x/machine.c | 30 +++ target-s390x/op_helper.c | 53 ++++++ vl.c | 26 +++ 19 files changed, 1418 insertions(+), 8 deletions(-) create mode 100644 hw/s390-virtio-bus.c create mode 100644 hw/s390-virtio-bus.h create mode 100644 hw/s390-virtio.c create mode 100644 target-s390x/kvm.c create mode 100644 target-s390x/machine.c
