Do I need to do trim on virtual machines?

Question

virtual box

Hello!
I have several virtual machines on SSD. The hypervisor runs trim once a day. Do I need to run trim on virtual machines too?

Answer 1

No, TRIM is an ATA command to the physical media itself. Virtual machines have a virtual disk as a data device, which will either ignore the TRIM command or forward it to a physical disk, but it is already periodically trimmed by the hypervisor.
Clarification according to Artem's answer:
This is true only if the hypervisor has complete information about free blocks on the disk. If the hypervisor only sees a fixed-size set of images, which may include "voids" of virtual free space, it will not be affected by the trim.
But if the disk image occupies only the amount corresponding to the actual space occupied, everything is ok.