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9fc34ada7e
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>
103 lines
3.4 KiB
C
103 lines
3.4 KiB
C
/*
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* QEMU sPAPR PCI host for VFIO
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*
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* Copyright (c) 2011-2014 Alexey Kardashevskiy, IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License,
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* or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "hw/ppc/spapr.h"
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#include "hw/pci-host/spapr.h"
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#include "linux/vfio.h"
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#include "hw/misc/vfio.h"
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static Property spapr_phb_vfio_properties[] = {
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DEFINE_PROP_INT32("iommu", sPAPRPHBVFIOState, iommugroupid, -1),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void spapr_phb_vfio_finish_realize(sPAPRPHBState *sphb, Error **errp)
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{
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sPAPRPHBVFIOState *svphb = SPAPR_PCI_VFIO_HOST_BRIDGE(sphb);
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struct vfio_iommu_spapr_tce_info info = { .argsz = sizeof(info) };
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int ret;
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sPAPRTCETable *tcet;
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uint32_t liobn = svphb->phb.dma_liobn;
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if (svphb->iommugroupid == -1) {
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error_setg(errp, "Wrong IOMMU group ID %d", svphb->iommugroupid);
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return;
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}
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ret = vfio_container_ioctl(&svphb->phb.iommu_as, svphb->iommugroupid,
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VFIO_CHECK_EXTENSION,
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(void *) VFIO_SPAPR_TCE_IOMMU);
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if (ret != 1) {
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error_setg_errno(errp, -ret,
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"spapr-vfio: SPAPR extension is not supported");
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return;
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}
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ret = vfio_container_ioctl(&svphb->phb.iommu_as, svphb->iommugroupid,
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VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info);
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if (ret) {
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error_setg_errno(errp, -ret,
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"spapr-vfio: get info from container failed");
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return;
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}
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tcet = spapr_tce_new_table(DEVICE(sphb), liobn, info.dma32_window_start,
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SPAPR_TCE_PAGE_SHIFT,
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info.dma32_window_size >> SPAPR_TCE_PAGE_SHIFT,
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true);
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if (!tcet) {
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error_setg(errp, "spapr-vfio: failed to create VFIO TCE table");
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return;
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}
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/* Register default 32bit DMA window */
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memory_region_add_subregion(&sphb->iommu_root, tcet->bus_offset,
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spapr_tce_get_iommu(tcet));
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}
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static void spapr_phb_vfio_reset(DeviceState *qdev)
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{
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/* Do nothing */
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}
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static void spapr_phb_vfio_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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sPAPRPHBClass *spc = SPAPR_PCI_HOST_BRIDGE_CLASS(klass);
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dc->props = spapr_phb_vfio_properties;
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dc->reset = spapr_phb_vfio_reset;
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spc->finish_realize = spapr_phb_vfio_finish_realize;
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}
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static const TypeInfo spapr_phb_vfio_info = {
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.name = TYPE_SPAPR_PCI_VFIO_HOST_BRIDGE,
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.parent = TYPE_SPAPR_PCI_HOST_BRIDGE,
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.instance_size = sizeof(sPAPRPHBVFIOState),
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.class_init = spapr_phb_vfio_class_init,
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.class_size = sizeof(sPAPRPHBClass),
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};
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static void spapr_pci_vfio_register_types(void)
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{
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type_register_static(&spapr_phb_vfio_info);
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}
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type_init(spapr_pci_vfio_register_types)
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