virt_use_sysfs

Does it make sense to not have this enabled by default?  Getting meminfo from 
sysfs seems like a very reasonable and useful thing for a virtualisation 
system to do.  Not allowing that doesn't seem to give any benefit but does 
have potential for serious problems if things even work like that.

#!!!! This avc can be allowed using one of the these booleans:
#     virt_use_sysfs, virt_use_usb
allow svirt_t sysfs_t:file read;
root@sevm:~/pol# setsebool ^C
root@sevm:~/pol# grep sysfs_t /var/log/audit/audit.log
type=AVC msg=audit(1594988146.629:317649): avc:  denied  { read } for  
pid=430606 comm="qemu-system-x86" name="meminfo" dev="sysfs" ino=1777 
scontext=system_u:system_r:svirt_t:s0:c518,c853 
tcontext=system_u:object_r:sysfs_t:s0 tclass=file permissive=0
type=AVC msg=audit(1594988146.701:317650): avc:  denied  { read } for  
pid=430606 comm="qemu-system-x86" name="max_mem_regions" dev="sysfs" ino=28161 
scontext=system_u:system_r:svirt_t:s0:c518,c853 
tcontext=system_u:object_r:sysfs_t:s0 tclass=file permissive=0
type=AVC msg=audit(1594988146.701:317651): avc:  denied  { read } for  
pid=430606 comm="qemu-system-x86" name="max_mem_regions" dev="sysfs" ino=28161 
scontext=system_u:system_r:svirt_t:s0:c518,c853 
tcontext=system_u:object_r:sysfs_t:s0 tclass=file permissive=0

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