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nodedev: cache parent address in mdev caps

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mdevctl can report multiple defined devices with the same UUID
but different parents, including parents that don't actually exist on
the host machine. Libvirt sets the parent to the 'computer' device for
all of the mdevs that have nonexistent parents. Because of this, it's
possible that there are multiple devices with the same UUID and the same
'computer' device as their parent, so the combination of uuid and parent
nodedev name is not guaranteed to be a unique name.

We need to ensure that each nodedev has a unique name. If we can't use
the UUID as a unique nodedev name, and we can't use the combination of
UUID and nodedev parent name, we need to find another solution. By
caching and using the parent name reported by mdevctl in combination
with the UUID, we can achieve a unique name. mdevctl guarantees that its
uuid/parent combination is unique.

This value will be used to set the mdev nodedev name in a following commit.

Signed-off-by: Jonathon Jongsma <jjongsma@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Jonathon Jongsma 2021-07-16 13:15:54 -05:00
parent a9c1febcf4
commit e44408dd9c
4 changed files with 19 additions and 0 deletions
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1
src/conf/node_device_conf.c
View File

@ -2309,6 +2309,7 @@ virNodeDevCapsDefFree(virNodeDevCapsDef *caps)
for (i = 0; i < data->mdev.nattributes; i++)
virMediatedDeviceAttrFree(data->mdev.attributes[i]);
g_free(data->mdev.attributes);
g_free(data->mdev.parent_addr);
break;
case VIR_NODE_DEV_CAP_CSS_DEV:
for (i = 0; i < data->ccw_dev.nmdev_types; i++)

1
src/conf/node_device_conf.h
View File

@ -153,6 +153,7 @@ struct _virNodeDevCapMdev {
char *uuid;
virMediatedDeviceAttr **attributes;
size_t nattributes;
char *parent_addr;
};
typedef struct _virNodeDevCapPCIDev virNodeDevCapPCIDev;

1
src/node_device/node_device_driver.c
View File

@ -1088,6 +1088,7 @@ nodeDeviceParseMdevctlChildDevice(const char *parent,
mdev = &child->caps->data.mdev;
mdev->uuid = g_strdup(uuid);
mdev->parent_addr = g_strdup(parent);
mdev->type =
g_strdup(virJSONValueObjectGetString(props, "mdev_type"));

16
src/node_device/node_device_udev.c
View File

@ -1024,6 +1024,7 @@ udevProcessMediatedDevice(struct udev_device *dev,
char *linkpath = NULL;
char *canonicalpath = NULL;
virNodeDevCapMdev *data = &def->caps->data.mdev;
struct udev_device *parent_device = NULL;
/* Because of a kernel uevent race, we might get the 'add' event prior to
* the sysfs tree being ready, so any attempt to access any sysfs attribute
@ -1051,6 +1052,21 @@ udevProcessMediatedDevice(struct udev_device *dev,
if ((iommugrp = virMediatedDeviceGetIOMMUGroupNum(data->uuid)) < 0)
goto cleanup;
/* lookup the address of parent device */
parent_device = udev_device_get_parent(dev);
if (parent_device) {
const char *parent_sysfs_path = udev_device_get_syspath(parent_device);
if (parent_sysfs_path)
data->parent_addr = g_path_get_basename(parent_sysfs_path);
}
if (!data->parent_addr) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Could not get parent of '%s'"),
udev_device_get_syspath(dev));
return -1;
}
udevGenerateDeviceName(dev, def, NULL);
data->iommuGroupNumber = iommugrp;