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hw/acpi/vmgenid: prevent more than one vmgenid device

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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>
This commit is contained in:
Laszlo Ersek 2017-03-20 18:05:57 +01:00 committed by Michael S. Tsirkin
parent f2a1ae45d8
commit f92063028a
2 changed files with 9 additions and 0 deletions
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8
hw/acpi/vmgenid.c
View file

@ -221,6 +221,14 @@ static void vmgenid_realize(DeviceState *dev, Error **errp)
return;
}
/* Given that this function is executing, there is at least one VMGENID
* device. Check if there are several.
*/
if (!find_vmgenid_dev()) {
error_setg(errp, "at most one %s device is permitted", VMGENID_DEVICE);
return;
}
qemu_register_reset(vmgenid_handle_reset, vms);
}

1
include/hw/acpi/vmgenid.h
View file

@ -24,6 +24,7 @@ typedef struct VmGenIdState {
bool write_pointer_available;
} VmGenIdState;
/* returns NULL unless there is exactly one device */
static inline Object *find_vmgenid_dev(void)
{
return object_resolve_path_type("", VMGENID_DEVICE, NULL);