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...different IOMMU implementations in either userspace or kernel. Thanks > > When designing it and writing the kvmtool device, I considered two main > scenarios, illustrated below. > > Scenario 1: a hardware device passed through twice via VFIO > > MEM____pIOMMU________PCI device________________________ HARDWARE > | (2b) \ > ----------|-------------+-------------+------------------\------------- > | : KVM : \ > | : : \ &...

...t switches to > the host and the possibility of in-kernel emulation. > > When designing it and writing the kvmtool device, I considered two main > scenarios, illustrated below. > > Scenario 1: a hardware device passed through twice via VFIO > > MEM____pIOMMU________PCI device________________________ > HARDWARE > | (2b) \ > ----------|-------------+-------------+------------------\------------- > | : KVM : \ > | : : \ >...

...fficient in some cases, with less context switches to the host and the possibility of in-kernel emulation. When designing it and writing the kvmtool device, I considered two main scenarios, illustrated below. Scenario 1: a hardware device passed through twice via VFIO MEM____pIOMMU________PCI device________________________ HARDWARE | (2b) \ ----------|-------------+-------------+------------------\------------- | : KVM : \ | : : \ pIOMMU drv...

...fficient in some cases, with less context switches to the host and the possibility of in-kernel emulation. When designing it and writing the kvmtool device, I considered two main scenarios, illustrated below. Scenario 1: a hardware device passed through twice via VFIO MEM____pIOMMU________PCI device________________________ HARDWARE | (2b) \ ----------|-------------+-------------+------------------\------------- | : KVM : \ | : : \ pIOMMU drv...