From b4b6eb771a5c2eec47fd87ea28c499a5aa4b6db2 Mon Sep 17 00:00:00 2001 From: Alexey Kardashevskiy Date: Wed, 1 Jun 2016 18:57:35 +1000 Subject: spapr_iommu: Add root memory region We are going to have multiple DMA windows at different offsets on a PCI bus. For the sake of migration, we will have as many TCE table objects pre-created as many windows supported. So we need a way to map windows dynamically onto a PCI bus when migration of a table is completed but at this stage a TCE table object does not have access to a PHB to ask it to map a DMA window backed by just migrated TCE table. This adds a "root" memory region (UINT64_MAX long) to the TCE object. This new region is mapped on a PCI bus with enabled overlapping as there will be one root MR per TCE table, each of them mapped at 0. The actual IOMMU memory region is a subregion of the root region and a TCE table enables/disables this subregion and maps it at the specific offset inside the root MR which is 1:1 mapping of a PCI address space. Signed-off-by: Alexey Kardashevskiy Reviewed-by: David Gibson Reviewed-by: Thomas Huth Signed-off-by: David Gibson --- include/hw/ppc/spapr.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'include') diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h index f849714ad7..971df3d0df 100644 --- a/include/hw/ppc/spapr.h +++ b/include/hw/ppc/spapr.h @@ -544,7 +544,7 @@ struct sPAPRTCETable { bool bypass; bool need_vfio; int fd; - MemoryRegion iommu; + MemoryRegion root, iommu; struct VIOsPAPRDevice *vdev; /* for @bypass migration compatibility only */ QLIST_ENTRY(sPAPRTCETable) list; }; -- cgit v1.2.3