@@ -205,6 +205,8 @@ struct intel_vgpu {
struct idr object_idr;
u32 scan_nonprivbb;
+
+ char *migration_version;
};
static inline void *intel_vgpu_vdev(struct intel_vgpu *vgpu)
@@ -728,8 +728,13 @@ static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
kvmgt_vdev(vgpu)->mdev = mdev;
mdev_set_drvdata(mdev, vgpu);
+ vgpu->migration_version =
+ intel_gvt_get_vfio_migration_version(gvt, type->name);
+
gvt_dbg_core("intel_vgpu_create succeeded for mdev: %s\n",
dev_name(mdev_dev(mdev)));
+
+
ret = 0;
out:
@@ -744,6 +749,7 @@ static int intel_vgpu_remove(struct mdev_device *mdev)
return -EBUSY;
intel_gvt_ops->vgpu_destroy(vgpu);
+ kfree(vgpu->migration_version);
return 0;
}
@@ -1964,8 +1970,57 @@ static const struct attribute_group intel_vgpu_group = {
.attrs = intel_vgpu_attrs,
};
+static ssize_t migration_version_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct mdev_device *mdev = mdev_from_dev(dev);
+ struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
+
+ if (!vgpu->migration_version) {
+ gvt_vgpu_err("Migration not supported on this vgpu. Please search previous detailed log\n");
+ return -ENODEV;
+ }
+
+ return snprintf(buf, strlen(vgpu->migration_version) + 2,
+ "%s\n", vgpu->migration_version);
+
+}
+
+static ssize_t migration_version_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct mdev_device *mdev = mdev_from_dev(dev);
+ struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
+ struct intel_gvt *gvt = vgpu->gvt;
+ int ret = 0;
+
+ if (!vgpu->migration_version) {
+ gvt_vgpu_err("Migration not supported on this vgpu. Please search previous detailed log\n");
+ return -ENODEV;
+ }
+
+ ret = intel_gvt_check_vfio_migration_version(gvt,
+ vgpu->migration_version, buf);
+ return (ret < 0 ? ret : count);
+}
+
+static DEVICE_ATTR_RW(migration_version);
+
+static struct attribute *intel_vgpu_migration_attrs[] = {
+ &dev_attr_migration_version.attr,
+ NULL,
+};
+/* this group has no name, so will be displayed
+ * immediately under sysfs node of the mdev device
+ */
+static const struct attribute_group intel_vgpu_group_empty_name = {
+ .attrs = intel_vgpu_migration_attrs,
+};
+
static const struct attribute_group *intel_vgpu_groups[] = {
&intel_vgpu_group,
+ &intel_vgpu_group_empty_name,
NULL,
};
mdev device par of migration_version attribute for Intel vGPU is rw. It is located at /sys/bus/pci/devices/0000\:00\:02.0/$mdev_UUID/migration_version, or /sys/bus/mdev/devices/$mdev_UUID/migration_version It's used to check migration compatibility for two vGPUs. migration_version string is defined by vendor driver and opaque to userspace. For Intel vGPU of gen8 and gen9, the format of migration_version string is: <vendor id>-<device id>-<vgpu type>-<software version>. For future software versions, e.g. when vGPUs have aggregations, it may also include aggregation count into migration_version string of a vGPU. For future platforms, the format of migration_version string is to be expanded to include more meta data to identify Intel vGPUs for live migration compatibility check For old platforms, and for GVT not supporting vGPU live migration feature, -ENODEV is returned on read(2)/write(2) of migration_version attribute. For vGPUs running old GVT who do not expose migration_version attribute, live migration is regarded as not supported for those vGPUs. Cc: Alex Williamson <alex.williamson@redhat.com> Cc: Erik Skultety <eskultet@redhat.com> Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com> Cc: Cornelia Huck <cohuck@redhat.com> Cc: "Tian, Kevin" <kevin.tian@intel.com> Cc: Zhenyu Wang <zhenyuw@linux.intel.com> Cc: "Wang, Zhi A" <zhi.a.wang@intel.com> c: Neo Jia <cjia@nvidia.com> Cc: Kirti Wankhede <kwankhede@nvidia.com> Signed-off-by: Yan Zhao <yan.y.zhao@intel.com> --- drivers/gpu/drm/i915/gvt/gvt.h | 2 ++ drivers/gpu/drm/i915/gvt/kvmgt.c | 55 ++++++++++++++++++++++++++++++++ 2 files changed, 57 insertions(+)