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libap: handle reading ap_config attribute

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While unlikely, it is possible for a vfio-ap configuration JSON
to include the 'ap_config' attribute.  In this case, process it
by overwriting the current list of adapters, domains and control
domains for the associated vfio-ap device struct.

Reviewed-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
Reviewed-by: Anthony Krowiak <akrowiak@linux.ibm.com>
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Matthew Rosato
2024-05-29 12:28:58 -04:00
committed by Jan Höppner
parent 962af1a90e
commit f6a97902c3
1 changed files with 33 additions and 0 deletions
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33
libap/ap.c
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@@ -121,6 +121,37 @@ static void modify_device_attr(struct util_list *list, char *value)
vfio_ap_node_remove_dupes(list);
}
/*
* Pass a comma-delimited string of masks (adapters,domains,controls) and
* for each ON bit in these masks add the associated ID to the device
* lists.
*/
static void modify_device_ap_config(struct vfio_ap_device *dev,
char *value)
{
char *mask, *adapters, *domains, *controls;
mask = util_strdup(value);
adapters = strtok(mask, ",");
domains = strtok(NULL, ",");
controls = strtok(NULL, ",");
util_assert((!strtok(NULL, ",")) && adapters && domains && controls,
"Invalid ap_config attribute encountered %s", value);
/*
* ap_config overwrites the current list of adapters, domains and
* control domains. Clear the current lists before generating new ones
* based upon the input mask values.
*/
ap_list_remove_all(dev->adapters);
ap_list_remove_all(dev->domains);
ap_list_remove_all(dev->controls);
ap_mask_to_list(adapters, dev->adapters);
ap_mask_to_list(domains, dev->domains);
ap_mask_to_list(controls, dev->controls);
}
static void load_attr_to_device(struct vfio_ap_device *dev, char *attr,
const char *value)
{
@@ -132,6 +163,8 @@ static void load_attr_to_device(struct vfio_ap_device *dev, char *attr,
modify_device_attr(dev->domains, v);
else if (strcmp(attr, "assign_control_domain") == 0)
modify_device_attr(dev->controls, v);
else if (strcmp(attr, "ap_config") == 0)
modify_device_ap_config(dev, v);
free(v);
}