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Re: [PATCH v8.1 1/2] target/s390x: support SHA-512 extensions

From: Thomas Huth
Subject: Re: [PATCH v8.1 1/2] target/s390x: support SHA-512 extensions
Date: Thu, 22 Sep 2022 17:55:22 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.13.0

On 22/09/2022 17.38, David Hildenbrand wrote:
From: "Jason A. Donenfeld" <Jason@zx2c4.com>

In order to fully support MSA_EXT_5, we have to support the SHA-512
special instructions. So implement those.

The implementation began as something TweetNacl-like, and then was
adjusted to be useful here. It's not very beautiful, but it is quite
short and compact, which is what we're going for.
@@ -52,6 +278,9 @@ uint32_t HELPER(msa)(CPUS390XState *env, uint32_t r1, 
uint32_t r2, uint32_t r3,
              cpu_stb_data_ra(env, param_addr, subfunc[i], ra);
+    case 3: /* CPACF_*_SHA_512 */
+        return cpacf_sha512(env, ra, env->regs[1], &env->regs[r2],
+                            &env->regs[r2 + 1], type);

I have to say that I liked Jason's v8 better here. Code 3 is also used for other instructions with completely different meaning, e.g. PCKMO uses 3 for TDEA-192 ... so having the "type" check here made more sense. (meta comment: maybe we should split up the msa function and stop using just one function for all crypto/rng related instructions? ... but that's of course something for a different patch series)


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