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spapr_pci: Allow PCI host bridge DMA window to be configured

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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 <david@gibson.dropbear.id.au>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
This commit is contained in:
David Gibson 2015-09-24 09:56:44 +10:00
parent fd5da5c472
commit f93caaac36
2 changed files with 6 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

7
hw/ppc/spapr_pci.c
View file

@ -1387,7 +1387,7 @@ 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) {
@ -1397,7 +1397,7 @@ 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));
}
@ -1430,6 +1430,9 @@ 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(),
};