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spapr_pci_vfio: Add spapr-pci-vfio-host-bridge to support vfio

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The patch adds a spapr-pci-vfio-host-bridge device type
which is a PCI Host Bridge with VFIO support. The new device
inherits from the spapr-pci-host-bridge device and adds an "iommu"
property which is an IOMMU id. This ID represents a minimal entity
for which IOMMU isolation can be guaranteed. In SPAPR architecture IOMMU
group is called a Partitionable Endpoint (PE).

Current implementation supports one IOMMU id per QEMU VFIO PHB. Since
SPAPR allows multiple PHB for no extra cost, this does not seem to
be a problem. This limitation may change in the future though.

Example of use:
Configure and Add 3 functions of a multifunctional device to QEMU:
(the NEC PCI USB card is used as an example here):
-device spapr-pci-vfio-host-bridge,id=USB,iommu=4,index=7 \
-device vfio-pci,host=4:0:1.0,addr=1.0,bus=USB,multifunction=true
-device vfio-pci,host=4:0:1.1,addr=1.1,bus=USB
-device vfio-pci,host=4:0:1.2,addr=1.2,bus=USB

where:
* index=7 is a QEMU PHB index (used as source for MMIO/MSI/IO windows
offset);
* iommu=4 is an IOMMU id which can be found in sysfs:
[aik@vpl2 ~]$ cd /sys/bus/pci/devices/0004:00:00.0/
[aik@vpl2 0004:00:00.0]$ ls -l iommu_group
lrwxrwxrwx 1 root root 0 Jun  5 12:49 iommu_group -> ../../../kernel/iommu_groups/4

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexey Kardashevskiy 2014-06-10 15:39:23 +10:00 • committed by Alexander Graf
parent 6d8be4c343
commit 9fc34ada7e
3 changed files with 116 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

11
include/hw/pci-host/spapr.h
View file

@ -30,10 +30,14 @@
#define SPAPR_MSIX_MAX_DEVS 32
#define TYPE_SPAPR_PCI_HOST_BRIDGE "spapr-pci-host-bridge"
#define TYPE_SPAPR_PCI_VFIO_HOST_BRIDGE "spapr-pci-vfio-host-bridge"
#define SPAPR_PCI_HOST_BRIDGE(obj) \
OBJECT_CHECK(sPAPRPHBState, (obj), TYPE_SPAPR_PCI_HOST_BRIDGE)
#define SPAPR_PCI_VFIO_HOST_BRIDGE(obj) \
OBJECT_CHECK(sPAPRPHBVFIOState, (obj), TYPE_SPAPR_PCI_VFIO_HOST_BRIDGE)
#define SPAPR_PCI_HOST_BRIDGE_CLASS(klass) \
OBJECT_CLASS_CHECK(sPAPRPHBClass, (klass), TYPE_SPAPR_PCI_HOST_BRIDGE)
#define SPAPR_PCI_HOST_BRIDGE_GET_CLASS(obj) \
@ -41,6 +45,7 @@
typedef struct sPAPRPHBClass sPAPRPHBClass;
typedef struct sPAPRPHBState sPAPRPHBState;
typedef struct sPAPRPHBVFIOState sPAPRPHBVFIOState;
struct sPAPRPHBClass {
PCIHostBridgeClass parent_class;
@ -76,6 +81,12 @@ struct sPAPRPHBState {
QLIST_ENTRY(sPAPRPHBState) list;
};
struct sPAPRPHBVFIOState {
sPAPRPHBState phb;
int32_t iommugroupid;
};
#define SPAPR_PCI_BASE_BUID 0x800000020000000ULL
#define SPAPR_PCI_WINDOW_BASE 0x10000000000ULL