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pseries: Implement IOMMU and DMA for PAPR PCI devices

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Currently the pseries machine emulation does not support DMA for emulated
PCI devices, because the PAPR spec always requires a (guest visible,
paravirtualized) IOMMU which was not implemented.  Now that we have
infrastructure for IOMMU emulation, we can correct this and allow PCI DMA
for pseries.

With the existing PAPR IOMMU code used for VIO devices, this is almost
trivial. We use a single DMAContext for each (virtual) PCI host bridge,
which is the usual configuration on real PAPR machines (which often have
_many_ PCI host bridges).

Cc: Alex Graf <agraf@suse.de>

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
David Gibson 2012-06-27 14:50:46 +10:00 • committed by Anthony Liguori
parent 5fa45de562
commit edded45406
4 changed files with 47 additions and 26 deletions
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1
hw/spapr_pci.h
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@ -38,6 +38,7 @@ typedef struct sPAPRPHBState {
MemoryRegion memspace, iospace;
target_phys_addr_t mem_win_addr, mem_win_size, io_win_addr, io_win_size;
MemoryRegion memwindow, iowindow;
DMAContext *dma;
struct {
uint32_t dt_irq;