• Jens Freimann's avatar
    KVM: s390: migrate vcpu interrupt state · 816c7667
    Jens Freimann authored
    This patch adds support to migrate vcpu interrupts. Two new vcpu ioctls
    are added which get/set the complete status of pending interrupts in one
    go. The ioctls are marked as available with the new capability
    KVM_CAP_S390_IRQ_STATE.
    
    We can not use a ONEREG, as the number of pending local interrupts is not
    constant and depends on the number of CPUs.
    
    To retrieve the interrupt state we add an ioctl KVM_S390_GET_IRQ_STATE.
    Its input parameter is a pointer to a struct kvm_s390_irq_state which
    has a buffer and length.  For all currently pending interrupts, we copy
    a struct kvm_s390_irq into the buffer and pass it to userspace.
    
    To store interrupt state into a buffer provided by userspace, we add an
    ioctl KVM_S390_SET_IRQ_STATE. It passes a struct kvm_s390_irq_state into
    the kernel and injects all interrupts contained in the buffer.
    Signed-off-by: default avatarJens Freimann <jfrei@linux.vnet.ibm.com>
    Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
    Acked-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
    816c7667
api.txt 109 KB