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spapr_pci: spapr_iommu: Make DMA window a subregion

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Currently the default DMA window is represented by a single MemoryRegion.
However there can be more than just one window so we need
a "root" memory region to be separated from the actual DMA window(s).

This introduces a "root" IOMMU memory region and adds a subregion for
the default DMA 32bit window. Following patches will add other
subregion(s).

This initializes a default DMA window subregion size to the guest RAM
size as this window can be switched into "bypass" mode which implements
direct DMA mapping.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexey Kardashevskiy 2014-05-27 15:36:32 +10:00 • committed by Alexander Graf
parent da6ccee418
commit cca7fad576
3 changed files with 20 additions and 3 deletions
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1
include/hw/pci-host/spapr.h
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@ -64,6 +64,7 @@ struct sPAPRPHBState {
uint64_t dma_window_size;
sPAPRTCETable *tcet;
AddressSpace iommu_as;
MemoryRegion iommu_root;
struct spapr_pci_lsi {
uint32_t irq;