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spapr_pci: Allow VFIO devices to work on the normal PCI host bridge

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The core VFIO infrastructure more or less allows VFIO devices to work
on any normal guest PCI host bridge (PHB) without extra logic.
However, the "spapr-pci-host-bridge" device (as opposed to the special
"spapr-pci-vfio-host-bridge" device) breaks this by using a partially
KVM accelerated implementation of the guest kernel IOMMU which won't
work with VFIO devices, without additional kernel support.

This patch allows VFIO devices to work on the spapr-pci-host-bridge,
by having it switch off KVM TCE acceleration when a VFIO device is
added to the PHB (either on startup, or by hotplug).

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 10:34:23 +10:00
parent c10325d6f9
commit 185181f883
1 changed files with 6 additions and 0 deletions
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6
hw/ppc/spapr_pci.c
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@ -1083,6 +1083,12 @@ static void spapr_phb_add_pci_device(sPAPRDRConnector *drc,
void *fdt = NULL;
int fdt_start_offset = 0, fdt_size;
if (object_dynamic_cast(OBJECT(pdev), "vfio-pci")) {
sPAPRTCETable *tcet = spapr_tce_find_by_liobn(phb->dma_liobn);
spapr_tce_set_need_vfio(tcet, true);
}
if (dev->hotplugged) {
fdt = create_device_tree(&fdt_size);
fdt_start_offset = spapr_create_pci_child_dt(phb, pdev, fdt, 0);