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hw/acpi/vmgenid: prevent more than one vmgenid device
A system with multiple VMGENID devices is undefined in the VMGENID spec by omission. Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Ben Warren <ben@skyportsystems.com> Cc: Igor Mammedov <imammedo@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Igor Mammedov <imammedo@redhat.com>
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@ -221,6 +221,14 @@ static void vmgenid_realize(DeviceState *dev, Error **errp)
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return;
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return;
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}
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}
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/* Given that this function is executing, there is at least one VMGENID
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* device. Check if there are several.
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*/
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if (!find_vmgenid_dev()) {
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error_setg(errp, "at most one %s device is permitted", VMGENID_DEVICE);
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return;
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}
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qemu_register_reset(vmgenid_handle_reset, vms);
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qemu_register_reset(vmgenid_handle_reset, vms);
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}
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}
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@ -24,6 +24,7 @@ typedef struct VmGenIdState {
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bool write_pointer_available;
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bool write_pointer_available;
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} VmGenIdState;
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} VmGenIdState;
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/* returns NULL unless there is exactly one device */
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static inline Object *find_vmgenid_dev(void)
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static inline Object *find_vmgenid_dev(void)
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{
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{
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return object_resolve_path_type("", VMGENID_DEVICE, NULL);
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return object_resolve_path_type("", VMGENID_DEVICE, NULL);
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