[PATCH v4 00/32] KVM: s390: enable zPCI for interpretive execution

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Note: A few patches in this series are dependent on Baolu's IOMMU domain ops    
split, which is currently in the next branch of linux-iommu. This series        
applies on top:                                                                 
https://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git     

Enable interpretive execution of zPCI instructions + adapter interruption
forwarding for s390x KVM vfio-pci.  This is done by introducing a new IOMMU
domain for s390x (KVM-managed), indicating via vfio that this IOMMU domain
should be used instead of the default, with subsequent management of the
hardware assists being handled via a new KVM ioctl for zPCI management.

By allowing intepretation of zPCI instructions and firmware delivery of         
interrupts to guests, we can significantly reduce the frequency of guest        
SIE exits for zPCI.  We then see additional gains by handling a hot-path        
instruction that can still intercept to the hypervisor (RPCIT) directly         
in kvm via the new IOMMU domain, whose map operations update the host           
DMA table with pinned guest entries over the specified range.


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