448179e33e
Currently the virtio-iommu device must be programmed before it allows DMA from any PCI device. This can make the VM entirely unusable when a virtio-iommu driver isn't present, for example in a bootloader that loads the OS from storage. Similarly to the other vIOMMU implementations, default to DMA bypassing the IOMMU during boot. Add a "boot-bypass" property, defaulting to true, that lets users change this behavior. Replace the VIRTIO_IOMMU_F_BYPASS feature, which didn't support bypass before feature negotiation, with VIRTIO_IOMMU_F_BYPASS_CONFIG. We add the bypass field to the migration stream without introducing subsections, based on the assumption that this virtio-iommu device isn't being used in production enough to require cross-version migration at the moment (all previous version required workarounds since they didn't support ACPI and boot-bypass). Reviewed-by: Eric Auger <eric.auger@redhat.com> Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> Message-Id: <20220214124356.872985-3-jean-philippe@linaro.org> Acked-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: Eric Auger <eric.auger@redhat.com> Tested-by: Eric Auger <eric.auger@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/*
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* virtio-iommu device
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*
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* Copyright (c) 2020 Red Hat, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2 or later, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef QEMU_VIRTIO_IOMMU_H
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#define QEMU_VIRTIO_IOMMU_H
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#include "standard-headers/linux/virtio_iommu.h"
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#include "hw/virtio/virtio.h"
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#include "hw/pci/pci.h"
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#include "qom/object.h"
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#define TYPE_VIRTIO_IOMMU "virtio-iommu-device"
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#define TYPE_VIRTIO_IOMMU_PCI "virtio-iommu-pci"
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OBJECT_DECLARE_SIMPLE_TYPE(VirtIOIOMMU, VIRTIO_IOMMU)
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#define TYPE_VIRTIO_IOMMU_MEMORY_REGION "virtio-iommu-memory-region"
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typedef struct IOMMUDevice {
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void *viommu;
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PCIBus *bus;
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int devfn;
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IOMMUMemoryRegion iommu_mr;
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AddressSpace as;
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} IOMMUDevice;
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typedef struct IOMMUPciBus {
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PCIBus *bus;
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IOMMUDevice *pbdev[]; /* Parent array is sparse, so dynamically alloc */
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} IOMMUPciBus;
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struct VirtIOIOMMU {
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VirtIODevice parent_obj;
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VirtQueue *req_vq;
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VirtQueue *event_vq;
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struct virtio_iommu_config config;
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uint64_t features;
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GHashTable *as_by_busptr;
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IOMMUPciBus *iommu_pcibus_by_bus_num[PCI_BUS_MAX];
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PCIBus *primary_bus;
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ReservedRegion *reserved_regions;
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uint32_t nb_reserved_regions;
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GTree *domains;
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QemuMutex mutex;
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GTree *endpoints;
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bool boot_bypass;
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};
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#endif
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