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target/s390x/tcg: SPX: check validity of new prefix

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According to the architecture, SET PREFIX must try to access the new
prefix area and recognize an addressing exception if the area is not
accessible.
For qemu this check prevents a crash in cpu_map_lowcore after an
inaccessible prefix area has been set.

Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Message-Id: <20220630094340.3646279-1-scgl@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Janis Schoetterl-Glausch 2022-06-30 11:43:40 +02:00 committed by Thomas Huth
parent 39e19f5f67
commit f8333de279
1 changed files with 7 additions and 0 deletions
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7
target/s390x/tcg/misc_helper.c
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@ -158,6 +158,13 @@ void HELPER(spx)(CPUS390XState *env, uint64_t a1)
if (prefix == old_prefix) {
return;
}
/*
* Since prefix got aligned to 8k and memory increments are a multiple of
* 8k checking the first page is sufficient
*/
if (!mmu_absolute_addr_valid(prefix, true)) {
tcg_s390_program_interrupt(env, PGM_ADDRESSING, GETPC());
}
env->psa = prefix;
HELPER_LOG("prefix: %#x\n", prefix);