How to Add storage to VMs on x86

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I have 1TB disk on my x86 machine, however when I created VMs, each was allocated just over 40GB and most of disk storage is unused as shown on /dev/mapper/rhel_mastone-home where 844 GB is unused. I would like my VMs to have between 250 to 400 GB each. I am not an SA so any help would be appreciated.

[root@mastone ~]# virsh pool-list --all --details

Name State Autostart Persistent Capacity Allocation Available

default running yes yes 69.97 GiB 39.53 GiB 30.43 GiB
Downloads running yes yes 69.97 GiB 39.53 GiB 30.43 GiB
gnome-boxes running yes yes 69.97 GiB 39.53 GiB 30.43 GiB
guest_images_fs running yes yes 69.97 GiB 39.53 GiB 30.43 GiB
isolinux inactive yes yes - - -

[root@mastone ~]# df -hP
Filesystem Size Used Avail Use% Mounted on
devtmpfs 16G 0 16G 0% /dev
tmpfs 16G 0 16G 0% /dev/shm
tmpfs 16G 9.7M 16G 1% /run
tmpfs 16G 0 16G 0% /sys/fs/cgroup
/dev/mapper/rhel_mastone-root 70G 40G 31G 57% /
/dev/sda2 1014M 260M 755M 26% /boot
/dev/mapper/rhel_mastone-home 844G 6.2G 838G 1% /home
/dev/sda1 599M 5.8M 594M 1% /boot/efi
tmpfs 3.1G 56K 3.1G 1% /run/user/0

AT

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