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machine: Provide a function to check the dynamic sysbus allowlist

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Provide a new function dynamic_sysbus_dev_allowed() which checks the
per-machine list of permitted dynamic sysbus devices and returns a
boolean result indicating whether the device is allowed.  We can use
this in the implementation of validate_sysbus_device(), but we will
also need it so that machine hotplug callbacks can validate devices
rather than assuming that any sysbus device might be hotpluggable
into the platform bus.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Message-id: 20210325153310.9131-3-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2021-03-25 15:33:08 +00:00
parent 387c0e8b41
commit 0fb124dbfa
2 changed files with 40 additions and 5 deletions
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21
hw/core/machine.c
View File

@ -529,20 +529,31 @@ void machine_class_allow_dynamic_sysbus_dev(MachineClass *mc, const char *type)
QAPI_LIST_PREPEND(mc->allowed_dynamic_sysbus_devices, g_strdup(type));
}
static void validate_sysbus_device(SysBusDevice *sbdev, void *opaque)
bool device_is_dynamic_sysbus(MachineClass *mc, DeviceState *dev)
{
MachineState *machine = opaque;
MachineClass *mc = MACHINE_GET_CLASS(machine);
bool allowed = false;
strList *wl;
Object *obj = OBJECT(dev);
if (!object_dynamic_cast(obj, TYPE_SYS_BUS_DEVICE)) {
return false;
}
for (wl = mc->allowed_dynamic_sysbus_devices;
!allowed && wl;
wl = wl->next) {
allowed |= !!object_dynamic_cast(OBJECT(sbdev), wl->value);
allowed |= !!object_dynamic_cast(obj, wl->value);
}
if (!allowed) {
return allowed;
}
static void validate_sysbus_device(SysBusDevice *sbdev, void *opaque)
{
MachineState *machine = opaque;
MachineClass *mc = MACHINE_GET_CLASS(machine);
if (!device_is_dynamic_sysbus(mc, DEVICE(sbdev))) {
error_report("Option '-device %s' cannot be handled by this machine",
object_class_get_name(object_get_class(OBJECT(sbdev))));
exit(1);

24
include/hw/boards.h
View File

@ -52,6 +52,30 @@ void machine_set_cpu_numa_node(MachineState *machine,
*/
void machine_class_allow_dynamic_sysbus_dev(MachineClass *mc, const char *type);
/**
* device_is_dynamic_sysbus: test whether device is a dynamic sysbus device
* @mc: Machine class
* @dev: device to check
*
* Returns: true if @dev is a sysbus device on the machine's list
* of dynamically pluggable sysbus devices; otherwise false.
*
* This function checks whether @dev is a valid dynamic sysbus device,
* by first confirming that it is a sysbus device and then checking it
* against the list of permitted dynamic sysbus devices which has been
* set up by the machine using machine_class_allow_dynamic_sysbus_dev().
*
* It is valid to call this with something that is not a subclass of
* TYPE_SYS_BUS_DEVICE; the function will return false in this case.
* This allows hotplug callback functions to be written as:
* if (device_is_dynamic_sysbus(mc, dev)) {
* handle dynamic sysbus case;
* } else if (some other kind of hotplug) {
* handle that;
* }
*/
bool device_is_dynamic_sysbus(MachineClass *mc, DeviceState *dev);
/*
* Checks that backend isn't used, preps it for exclusive usage and
* returns migratable MemoryRegion provided by backend.