Here are the commands or fstab configurations you need to set up separate swap space for each VM on an SSD with KVM:

**Create a separate LVM group for the swap space:**

```
# vgcreate ssd-swap
```

**Create a swap volume within the LVM group:**

```
# lvcreate -L 100G -n swap ssd-swap
```

**Format the swap volume:**

```
# mkswap /dev/mapper/ssd-swap-swap
```

**Enable the swap space:**

```
# swapon /dev/mapper/ssd-swap-swap
```

**Add the swap space to the fstab file:**

```
/dev/mapper/ssd-swap-swap swap swap defaults 0 0
```

Once you have completed these steps, each VM will have its own swap space on the SSD.

Here are some additional notes:

* The amount of swap space you need will depend on the workload of your VMs. A good rule of thumb is to allocate 1.5x the amount of RAM for each VM.
* You can also use a separate physical disk for swap space, but this is not as efficient as using an SSD.
* If you are using LVM, you can create a separate logical volume for swap space. This will make it easier to manage the swap space and to resize it as needed.

I hope this helps! Let me know if you have any other questions.
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