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qdev/machine: Introduce hotplug_allowed hook

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Introduce this new per-machine hook to give any machine class a chance
to do a sanity check on the to-be-hotplugged device as a sanity test.
This will be used for x86 to try to detect some illegal configuration
of devices, e.g., possible conflictions between vfio-pci and x86
vIOMMU.

Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20190916080718.3299-3-peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Peter Xu 2019-09-16 16:07:16 +08:00 • committed by Michael S. Tsirkin
parent 28cf553afe
commit d2321d31ff
4 changed files with 34 additions and 0 deletions
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9
include/hw/boards.h
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@ -166,6 +166,13 @@ typedef struct {
* The function pointer to hook different machine specific functions for
* parsing "smp-opts" from QemuOpts to MachineState::CpuTopology and more
* machine specific topology fields, such as smp_dies for PCMachine.
* @hotplug_allowed:
* If the hook is provided, then it'll be called for each device
* hotplug to check whether the device hotplug is allowed. Return
* true to grant allowance or false to reject the hotplug. When
* false is returned, an error must be set to show the reason of
* the rejection. If the hook is not provided, all hotplug will be
* allowed.
*/
struct MachineClass {
/*< private >*/
@ -224,6 +231,8 @@ struct MachineClass {
HotplugHandler *(*get_hotplug_handler)(MachineState *machine,
DeviceState *dev);
bool (*hotplug_allowed)(MachineState *state, DeviceState *dev,
Error **errp);
CpuInstanceProperties (*cpu_index_to_instance_props)(MachineState *machine,
unsigned cpu_index);
const CPUArchIdList *(*possible_cpu_arch_ids)(MachineState *machine);