From 9fc34ada7e80a7c561f64eb124b2b814a8feca68 Mon Sep 17 00:00:00 2001 From: Alexey Kardashevskiy Date: Tue, 10 Jun 2014 15:39:23 +1000 Subject: spapr_pci_vfio: Add spapr-pci-vfio-host-bridge to support vfio 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 Signed-off-by: Alexander Graf --- include/hw/pci-host/spapr.h | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'include') diff --git a/include/hw/pci-host/spapr.h b/include/hw/pci-host/spapr.h index 0934518bbd..6808e967bd 100644 --- a/include/hw/pci-host/spapr.h +++ b/include/hw/pci-host/spapr.h @@ -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 -- cgit v1.2.3-55-g7522