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


From: David Hildenbrand
Subject: Re: [PATCH v8.1 1/2] target/s390x: support SHA-512 extensions
Date: Fri, 23 Sep 2022 13:35:35 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.3.0

On 23.09.22 13:19, Jason A. Donenfeld wrote:
On Fri, Sep 23, 2022 at 12:47 PM David Hildenbrand <david@redhat.com> wrote:
You must be fortunate if "one afternoon" is not a significant time
investment. For me it is a significant investment.

For me too, to say the least of the multiple afternoons I've spent on
this patch set. Getting back to technical content:

and sort out the remaining issues. I thought we (Thomas included) had an
agreement that that's the way we are going to do it. Apparently I was wrong.
Most probably I lived in the kernel space too long such that we don't
rush something upstream. For that reason *I* sent out a patch with
Here I am, getting told by Thomas that we now do it differently now.
What I really tried to express here is: if Thomas wants to commit things
differently now, maybe he can just separate the cleanup parts. I really
*don't want* to send out a multi-patch series to cleanup individual
parts -- that takes significantly more time. Especially not if something
is not committed yet.

To recap what's been fixed in your v8.1, versus what's been refactored
out of style preference:

1) It handles the machine versioning.
2) It throws an exception on length alignment in KIMD mode:
+    /* KIMD: length has to be properly aligned. */
+    if (type == S390_FEAT_TYPE_KIMD && !QEMU_IS_ALIGNED(len, 128)) {
+        tcg_s390_program_interrupt(env, PGM_SPECIFICATION, ra);
+    }
3) It asserts if type is neither KIMD vs KLMD, with:
+    g_assert(type == S390_FEAT_TYPE_KIMD || type == S390_FEAT_TYPE_KLMD);


One important part is

4) No memory modifications before all inputs were read

--
Thanks,

David / dhildenb




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