From 4e13c1ac6baa1d6c2b650d66ca89e1e12727ec19 Mon Sep 17 00:00:00 2001 From: Alexey Kardashevskiy Date: Tue, 21 May 2013 13:33:09 +1000 Subject: powerpc/vfio: Enable on PowerNV platform This initializes IOMMU groups based on the IOMMU configuration discovered during the PCI scan on POWERNV (POWER non virtualized) platform. The IOMMU groups are to be used later by the VFIO driver, which is used for PCI pass through. It also implements an API for mapping/unmapping pages for guest PCI drivers and providing DMA window properties. This API is going to be used later by QEMU-VFIO to handle h_put_tce hypercalls from the KVM guest. The iommu_put_tce_user_mode() does only a single page mapping as an API for adding many mappings at once is going to be added later. Although this driver has been tested only on the POWERNV platform, it should work on any platform which supports TCE tables. As h_put_tce hypercall is received by the host kernel and processed by the QEMU (what involves calling the host kernel again), performance is not the best - circa 220MB/s on 10Gb ethernet network. To enable VFIO on POWER, enable SPAPR_TCE_IOMMU config option and configure VFIO as required. Cc: David Gibson Signed-off-by: Alexey Kardashevskiy Signed-off-by: Paul Mackerras Signed-off-by: Benjamin Herrenschmidt --- drivers/iommu/Kconfig | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'drivers/iommu') diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig index c332fb98480d..3f3abde8a7f9 100644 --- a/drivers/iommu/Kconfig +++ b/drivers/iommu/Kconfig @@ -261,4 +261,12 @@ config SHMOBILE_IOMMU_L1SIZE default 256 if SHMOBILE_IOMMU_ADDRSIZE_64MB default 128 if SHMOBILE_IOMMU_ADDRSIZE_32MB +config SPAPR_TCE_IOMMU + bool "sPAPR TCE IOMMU Support" + depends on PPC_POWERNV + select IOMMU_API + help + Enables bits of IOMMU API required by VFIO. The iommu_ops + is not implemented as it is not necessary for VFIO. + endif # IOMMU_SUPPORT -- cgit v1.2.3