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[PATCH v2] target/s390x/tcg: SPX: check validity of new prefix
From: |
Janis Schoetterl-Glausch |
Subject: |
[PATCH v2] target/s390x/tcg: SPX: check validity of new prefix |
Date: |
Thu, 30 Jun 2022 11:43:40 +0200 |
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>
---
target/s390x/tcg/misc_helper.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/target/s390x/tcg/misc_helper.c b/target/s390x/tcg/misc_helper.c
index aab9c47747..10dadb002a 100644
--- a/target/s390x/tcg/misc_helper.c
+++ b/target/s390x/tcg/misc_helper.c
@@ -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);
base-commit: 3a821c52e1a30ecd9a436f2c67cc66b5628c829f
--
2.36.1
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