From 0fb124dbfa135945fb892d0d2b7a427cdc59220d Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Thu, 25 Mar 2021 15:33:08 +0000 Subject: [PATCH] machine: Provide a function to check the dynamic sysbus allowlist 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 Reviewed-by: Richard Henderson Reviewed-by: Mark Cave-Ayland Reviewed-by: Eric Auger Message-id: 20210325153310.9131-3-peter.maydell@linaro.org --- hw/core/machine.c | 21 ++++++++++++++++----- include/hw/boards.h | 24 ++++++++++++++++++++++++ 2 files changed, 40 insertions(+), 5 deletions(-) diff --git a/hw/core/machine.c b/hw/core/machine.c index 9935c6ddd5..8d97094736 100644 --- a/hw/core/machine.c +++ b/hw/core/machine.c @@ -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); diff --git a/include/hw/boards.h b/include/hw/boards.h index 6fc5cefcec..ad6c8fd537 100644 --- a/include/hw/boards.h +++ b/include/hw/boards.h @@ -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.