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target/s390x: Indicate and check for local tlb clearing 

Let's allow to enable it for the qemu cpu model and correctly emulate
it.

Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20170622094151.28633-2-david@redhat.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
David Hildenbrand 2017-06-22 11:41:49 +02:00 committed by Richard Henderson
parent 159fed45db
commit faf1c63d34
3 changed files with 6 additions and 3 deletions
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1
target/s390x/cpu_models.c
View File

@ -688,6 +688,7 @@ static void add_qemu_cpu_model_features(S390FeatBitmap fbm)
S390_FEAT_FLOATING_POINT_SUPPPORT_ENH,
S390_FEAT_STFLE_45,
S390_FEAT_STFLE_49,
S390_FEAT_LOCAL_TLB_CLEARING,
S390_FEAT_STFLE_53,
};
int i;

2
target/s390x/mem_helper.c
View File

@ -1629,8 +1629,6 @@ void HELPER(ipte)(CPUS390XState *env, uint64_t pto, uint64_t vaddr,
/* XXX we exploit the fact that Linux passes the exact virtual
address here - it's not obliged to! */
/* XXX: the LC bit should be considered as 0 if the local-TLB-clearing
facility is not installed. */
if (m4 & 1) {
tlb_flush_page(cs, page);
} else {

6
target/s390x/translate.c
View File

@ -2385,7 +2385,11 @@ static ExitStatus op_ipte(DisasContext *s, DisasOps *o)
TCGv_i32 m4;
check_privileged(s);
m4 = tcg_const_i32(get_field(s->fields, m4));
if (s390_has_feat(S390_FEAT_LOCAL_TLB_CLEARING)) {
m4 = tcg_const_i32(get_field(s->fields, m4));
} else {
m4 = tcg_const_i32(0);
}
gen_helper_ipte(cpu_env, o->in1, o->in2, m4);
tcg_temp_free_i32(m4);
return NO_EXIT;