Re: [PATCH] powerpc: Prepare to support kernel handling of IOMMU map/unmap

2013-07-25 Thread Alexey Kardashevskiy
On 07/25/2013 08:26 PM, Alexey Kardashevskiy wrote: > The current VFIO-on-POWER implementation supports only user mode > driven mapping, i.e. QEMU is sending requests to map/unmap pages. > However this approach is really slow, so we want to move that to KVM. > Since H_PUT_TCE can be extremely perfo

[PATCH] powerpc: Prepare to support kernel handling of IOMMU map/unmap

2013-07-25 Thread Alexey Kardashevskiy
The current VFIO-on-POWER implementation supports only user mode driven mapping, i.e. QEMU is sending requests to map/unmap pages. However this approach is really slow, so we want to move that to KVM. Since H_PUT_TCE can be extremely performance sensitive (especially with network adapters where eac