Paolo, here is a preview of a rework of CPU state on s390x. Since we extend MP_STATE I wanted to send an RFC upfront. I will wait for some feedback and send a proper pull request in the next week: ----- This series enables the "KVM_SET_MP_STATE" ioctl on s390 to make the cpu state settable by user space. This helps us to avoid races in SIGP/Reset handling that happen because some SIGPs are handled in QEMU, others in the KERNEL. As soon as the new interface is touched, user space takes complete control of the cpu states. Otherwise the old way is used. Therefore, the new kernel should continue to work fine with old QEMUs. David Hildenbrand (5): KVM: s390: allow only one SIGP STOP (AND STORE STATUS) at a time KVM: s390: move finalization of SIGP STOP orders to kvm_s390_vcpu_stop KVM: s390: remove __cpu_is_stopped and expose is_vcpu_stopped KVM: prepare for KVM_(S|G)ET_MP_STATE on other architectures KVM: s390: implement KVM_(S|G)ET_MP_STATE for user space state control Documentation/virtual/kvm/api.txt | 31 ++++++++++++++--------- arch/s390/include/asm/kvm_host.h | 1 + arch/s390/kvm/diag.c | 3 ++- arch/s390/kvm/intercept.c | 32 ++++++++++-------------- arch/s390/kvm/kvm-s390.c | 52 +++++++++++++++++++++++++++++++-------- arch/s390/kvm/kvm-s390.h | 10 ++++++-- arch/s390/kvm/sigp.c | 7 +++++- include/uapi/linux/kvm.h | 7 +++++- 8 files changed, 98 insertions(+), 45 deletions(-) -- 1.8.4.2 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
