At present the PCI host bridge (PHB) for the pseries machine
type has a fixed DMA window from 0..1GB (in PCI address space)
which is mapped to real memory via the PAPR paravirtualized
IOMMU.
For better support of VFIO devices, we're going to want to
allow for different configurations of the DMA window.
Eventually we'll want to allow the guest itself to reconfigure
the window via the PAPR dynamic DMA window interface, but as a
preliminary this patch allows the user to reconfigure the
window with new properties on the PHB device.
Signed-off-by: David Gibson <address@hidden> ---
hw/ppc/spapr_pci.c | 7 +++++--
include/hw/pci-host/spapr.h | 3 +-- 2 files changed, 6
insertions(+), 4 deletions(-)
diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c index
b088491..622c4ac 100644 --- a/hw/ppc/spapr_pci.c +++
b/hw/ppc/spapr_pci.c @@ -1394,7 +1394,7 @@ static void
spapr_phb_finish_realize(sPAPRPHBState *sphb, Error **errp)
sPAPRTCETable *tcet; uint32_t nb_table;
- nb_table = SPAPR_PCI_DMA32_SIZE >> SPAPR_TCE_PAGE_SHIFT; +
nb_table = sphb->dma_win_size >> SPAPR_TCE_PAGE_SHIFT; tcet =
spapr_tce_new_table(DEVICE(sphb), sphb->dma_liobn, 0,
SPAPR_TCE_PAGE_SHIFT, nb_table, false); if (!tcet) { @@ -1404,7
+1404,7 @@ static void spapr_phb_finish_realize(sPAPRPHBState
*sphb, Error **errp) }
/* Register default 32bit DMA window */ -
memory_region_add_subregion(&sphb->iommu_root, 0, +
memory_region_add_subregion(&sphb->iommu_root,
sphb->dma_win_addr, spapr_tce_get_iommu(tcet)); }
@@ -1437,6 +1437,9 @@ static Property spapr_phb_properties[] =
{ SPAPR_PCI_IO_WIN_SIZE),
DEFINE_PROP_BOOL("dynamic-reconfiguration", sPAPRPHBState,
dr_enabled, true), + /* Default DMA window is 0..1GB */ +
DEFINE_PROP_UINT64("dma_win_addr", sPAPRPHBState, dma_win_addr,
0), + DEFINE_PROP_UINT64("dma_win_size", sPAPRPHBState,
dma_win_size, 0x40000000), DEFINE_PROP_END_OF_LIST(), };