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target/s390x: support PRNO_TRNG instruction

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In order for hosts running inside of TCG to initialize the kernel's
random number generator, we should support the PRNO_TRNG instruction,
backed in the usual way with the qemu_guest_getrandom helper. This is
confirmed working on Linux 5.19.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Message-Id: <20220921100729.2942008-2-Jason@zx2c4.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
[thuth: turn prno-trng off in avocado test to avoid breaking it]
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Jason A. Donenfeld 2022-09-21 12:07:29 +02:00 • committed by Thomas Huth
parent 9f17bfdab4
commit 3dbc5fdacb
3 changed files with 32 additions and 0 deletions
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target/s390x/gen-features.c
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@ -757,6 +757,7 @@ static uint16_t qemu_MAX[] = {
S390_FEAT_MSA_EXT_5,
S390_FEAT_KIMD_SHA_512,
S390_FEAT_KLMD_SHA_512,
S390_FEAT_PRNO_TRNG,
};
/****** END FEATURE DEFS ******/