Function builder_from_start_info 

pub fn builder_from_start_info(
    info: StartInfo,
    mem: &mut GuestMem,
) -> Result<DeviceBuilder<NotifyEvent>, DeviceError>

Construct a DeviceBuilder from the provided StartInfo

Consumes all the handles out of the StartInfo and will initialize the provided GuestMem using [GuestMem::provide_vmo].

from_start_info is the preferred way to construct a DeviceBuilder, this variant exists should your device have unusual requirements on the lifetime of GuestMem.

The state of [mem] is undefined if an Error is returned.