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vfio/container: Implement HostIOMMUDeviceClass::realize() handler 

The realize function populates the capabilities. For now only the
aw_bits caps is computed for legacy backend.

Introduce a helper function vfio_device_get_aw_bits() which calls
range_get_last_bit() to get host aw_bits and package it in
HostIOMMUDeviceCaps for query with .get_cap(). This helper will
also be used by iommufd backend.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Zhenzhong Duan 2024-06-05 16:30:32 +08:00 committed by Cédric Le Goater
parent 6f274444c5
commit d441e05e26
3 changed files with 37 additions and 0 deletions
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19
hw/vfio/container.c
View File

@ -1136,6 +1136,24 @@ static void vfio_iommu_legacy_class_init(ObjectClass *klass, void *data)
vioc->pci_hot_reset = vfio_legacy_pci_hot_reset;
};
static bool hiod_legacy_vfio_realize(HostIOMMUDevice *hiod, void *opaque,
Error **errp)
{
VFIODevice *vdev = opaque;
hiod->name = g_strdup(vdev->name);
hiod->caps.aw_bits = vfio_device_get_aw_bits(vdev);
return true;
}
static void hiod_legacy_vfio_class_init(ObjectClass *oc, void *data)
{
HostIOMMUDeviceClass *hioc = HOST_IOMMU_DEVICE_CLASS(oc);
hioc->realize = hiod_legacy_vfio_realize;
};
static const TypeInfo types[] = {
{
.name = TYPE_VFIO_IOMMU_LEGACY,
@ -1144,6 +1162,7 @@ static const TypeInfo types[] = {
}, {
.name = TYPE_HOST_IOMMU_DEVICE_LEGACY_VFIO,
.parent = TYPE_HOST_IOMMU_DEVICE,
.class_init = hiod_legacy_vfio_class_init,
}
};

17
hw/vfio/helpers.c
View File

@ -658,3 +658,20 @@ void vfio_device_init(VFIODevice *vbasedev, int type, VFIODeviceOps *ops,
vbasedev->ram_block_discard_allowed = ram_discard;
}
int vfio_device_get_aw_bits(VFIODevice *vdev)
{
/*
* iova_ranges is a sorted list. For old kernels that support
* VFIO but not support query of iova ranges, iova_ranges is NULL,
* in this case HOST_IOMMU_DEVICE_CAP_AW_BITS_MAX(64) is returned.
*/
GList *l = g_list_last(vdev->bcontainer->iova_ranges);
if (l) {
Range *range = l->data;
return range_get_last_bit(range) + 1;
}
return HOST_IOMMU_DEVICE_CAP_AW_BITS_MAX;
}

1
include/hw/vfio/vfio-common.h
View File

@ -289,4 +289,5 @@ bool vfio_device_get_name(VFIODevice *vbasedev, Error **errp);
void vfio_device_set_fd(VFIODevice *vbasedev, const char *str, Error **errp);
void vfio_device_init(VFIODevice *vbasedev, int type, VFIODeviceOps *ops,
DeviceState *dev, bool ram_discard);
int vfio_device_get_aw_bits(VFIODevice *vdev);
#endif /* HW_VFIO_VFIO_COMMON_H */