The perf-kvm --guestmount option fails.

Issue

• The man page of perk-kvm introduces 'perf kvm record' command like below:

SYNOPSIS                                                                 
       perf kvm [--host] [--guest] [--guestmount=<path>                    
               [--guestkallsyms=<path> --guestmodules=<path> | --guestvmlinux=<path>]]
               {top|record|report|diff|buildid-list}                                  
       perf kvm [--host] [--guest] [--guestkallsyms=<path> --guestmodules=<path>      
               | --guestvmlinux=<path>] {top|record|report|diff|buildid-list|stat}    

• Actually, after we execute command:

perf kvm --guest \                              
                                  --guestkallsyms=/tmp/guest.kallsyms                 
                                  --guestmodules=/tmp/guest.modules record            
                                  -a                                                  
                                  -o /tmp/perf.data sleep 60 

No buildid information was recorded in /tmp/perf.data
- "perf buildid-list -i /tmp/perf.data" shows nothing.
- Is this behavior either a bug of perf or a bug of manual?