Re: [PATCH v6 1/3] KVM: selftests: implement random number generation for guest code

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On Mon, Sep 12, 2022, Colton Lewis wrote:
> Implement random number generation for guest code to randomize parts
> of the test, making it less predictable and a more accurate reflection
> of reality.
> 
> Create a -r argument to specify a random seed. If no argument is
> provided, the seed defaults to 0. The random seed is set with
> perf_test_set_random_seed() and must be set before guest_code runs to
> apply.
> 
> The random number generator chosen is the Park-Miller Linear
> Congruential Generator, a fancy name for a basic and well-understood
> random number generator entirely sufficient for this purpose. Each
> vCPU calculates its own seed by adding its index to the seed provided.

Why not grab the kernel's pseudo-RNG from prandom_seed_state() + prandom_u32_state()?



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