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s390x/mmu_helper: avoid setting the storage key if nothing changed 

Avoid setting the key if nothing changed.

Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20210903155514.44772-9-david@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
David Hildenbrand 2021-09-03 17:55:09 +02:00 committed by Thomas Huth
parent 390191c6f6
commit 380ac2bcce
1 changed files with 7 additions and 4 deletions
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5
target/s390x/mmu_helper.c
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@ -301,7 +301,7 @@ static void mmu_handle_skey(target_ulong addr, int rw, int *flags)
{ {
static S390SKeysClass *skeyclass; static S390SKeysClass *skeyclass;
static S390SKeysState *ss; static S390SKeysState *ss;
uint8_t key; uint8_t key, old_key;
int rc; int rc;
/* /*
@ -337,6 +337,7 @@ static void mmu_handle_skey(target_ulong addr, int rw, int *flags)
trace_get_skeys_nonzero(rc); trace_get_skeys_nonzero(rc);
return; return;
} }
old_key = key;
switch (rw) { switch (rw) {
case MMU_DATA_LOAD: case MMU_DATA_LOAD:
@ -360,10 +361,12 @@ static void mmu_handle_skey(target_ulong addr, int rw, int *flags)
/* Any store/fetch sets the reference bit */ /* Any store/fetch sets the reference bit */
key |= SK_R; key |= SK_R;
if (key != old_key) {
rc = skeyclass->set_skeys(ss, addr / TARGET_PAGE_SIZE, 1, &key); rc = skeyclass->set_skeys(ss, addr / TARGET_PAGE_SIZE, 1, &key);
if (rc) { if (rc) {
trace_set_skeys_nonzero(rc); trace_set_skeys_nonzero(rc);
} }
}
} }
/** /**