[lsh123]

There are possible mitigations for cloud providers: 1) pay $x / hour and run on shared machine with possibility of an attack; 2) pay $y / hour (where x < y) and run all your processeses on dedicated machines without anybody else.

Moreover the option 2) already exists for large customers and security sensitive applications (e.g. CIA dedicated cloud built by Amazon).

[user5994461]

Amazon instances can be created with the dedicated flag. The host hardware will be dedicated to you, not shared with any other users. It should mitigate the attack.

The flag has a fixed fee in the thousands of dollars and each instance is 10% more expensive.