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virtio-pci: implement iommu_enabled()

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This patch implements the PCI transport version of iommu_enabled. This
is done by comparing the address space returned by
pci_device_iommu_address_space() against address_space_memory.

Note that an ideal approach is to use pci_device_iommu_address_space()
in get_dma_as(), but it might not work well since the IOMMU could be
initialized after the virtio-pci device is initialized.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20210804034803.1644-3-jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang 2021-08-04 11:48:02 +08:00 committed by Michael S. Tsirkin
parent dd014b4f49
commit 3d1e5d86fe
1 changed files with 14 additions and 0 deletions
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14
hw/virtio/virtio-pci.c
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@ -1121,6 +1121,19 @@ static AddressSpace *virtio_pci_get_dma_as(DeviceState *d)
return pci_get_address_space(dev);
}
static bool virtio_pci_iommu_enabled(DeviceState *d)
{
VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
PCIDevice *dev = &proxy->pci_dev;
AddressSpace *dma_as = pci_device_iommu_address_space(dev);
if (dma_as == &address_space_memory) {
return false;
}
return true;
}
static bool virtio_pci_queue_enabled(DeviceState *d, int n)
{
VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
@ -2202,6 +2215,7 @@ static void virtio_pci_bus_class_init(ObjectClass *klass, void *data)
k->ioeventfd_enabled = virtio_pci_ioeventfd_enabled;
k->ioeventfd_assign = virtio_pci_ioeventfd_assign;
k->get_dma_as = virtio_pci_get_dma_as;
k->iommu_enabled = virtio_pci_iommu_enabled;
k->queue_enabled = virtio_pci_queue_enabled;
}