Merge tag 'pull-vfio-20240723-1' of https://github.com/legoater/qemu into staging

vfio queue:

* IOMMUFD Dirty Tracking support
* Fix for a possible SEGV in IOMMU type1 container
* Dropped initialization of host IOMMU device with mdev devices

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* tag 'pull-vfio-20240723-1' of https://github.com/legoater/qemu:
  vfio/common: Allow disabling device dirty page tracking
  vfio/migration: Don't block migration device dirty tracking is unsupported
  vfio/iommufd: Implement VFIOIOMMUClass::query_dirty_bitmap support
  vfio/iommufd: Implement VFIOIOMMUClass::set_dirty_tracking support
  vfio/iommufd: Probe and request hwpt dirty tracking capability
  vfio/{iommufd, container}: Invoke HostIOMMUDevice::realize() during attach_device()
  vfio/iommufd: Add hw_caps field to HostIOMMUDeviceCaps
  vfio/{iommufd,container}: Remove caps::aw_bits
  vfio/iommufd: Introduce auto domain creation
  vfio/ccw: Don't initialize HOST_IOMMU_DEVICE with mdev
  vfio/ap: Don't initialize HOST_IOMMU_DEVICE with mdev
  vfio/iommufd: Return errno in iommufd_cdev_attach_ioas_hwpt()
  backends/iommufd: Extend iommufd_backend_get_device_info() to fetch HW capabilities
  vfio/iommufd: Don't initialize nor set a HOST_IOMMU_DEVICE with mdev
  vfio/pci: Extract mdev check into an helper
  hw/vfio/container: Fix SIGSEV on vfio_container_instance_finalize()

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 25 insertions, 0 deletions

diff --git a/hw/vfio/helpers.c b/hw/vfio/helpers.c
index b14edd46ed..ea15c79db0 100644
--- a/hw/vfio/helpers.c
+++ b/hw/vfio/helpers.c
@@ -675,3 +675,28 @@ int vfio_device_get_aw_bits(VFIODevice *vdev)
 
     return HOST_IOMMU_DEVICE_CAP_AW_BITS_MAX;
 }
+
+bool vfio_device_is_mdev(VFIODevice *vbasedev)
+{
+    g_autofree char *subsys = NULL;
+    g_autofree char *tmp = NULL;
+
+    if (!vbasedev->sysfsdev) {
+        return false;
+    }
+
+    tmp = g_strdup_printf("%s/subsystem", vbasedev->sysfsdev);
+    subsys = realpath(tmp, NULL);
+    return subsys && (strcmp(subsys, "/sys/bus/mdev") == 0);
+}
+
+bool vfio_device_hiod_realize(VFIODevice *vbasedev, Error **errp)
+{
+    HostIOMMUDevice *hiod = vbasedev->hiod;
+
+    if (!hiod) {
+        return true;
+    }
+
+    return HOST_IOMMU_DEVICE_GET_CLASS(hiod)->realize(hiod, vbasedev, errp);
+}