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target/s390x: introduce (test|set)_be_bit

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Using ordinary bitmap operations to set/test bits does not work properly
on architectures !s390x. Let's drop (test|set)_bit_inv and introduce
(test|set)_be_bit instead. These functions work on uint8_t array, not on
unsigned longs arrays and are for now only used in the context of
CPU features.

Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20170720123721.12366-4-david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
David Hildenbrand 2017-07-20 14:37:19 +02:00 committed by Cornelia Huck
parent cc18f90762
commit 3d1cfc3c68
3 changed files with 14 additions and 16 deletions
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8
target/s390x/cpu_features.c
View file

@ -340,8 +340,8 @@ void s390_fill_feat_block(const S390FeatBitmap features, S390FeatType type,
case S390_FEAT_TYPE_STFL:
if (test_bit(S390_FEAT_ZARCH, features)) {
/* Features that are always active */
data[0] |= 0x20; /* z/Architecture */
data[17] |= 0x20; /* Configuration-z-architectural-mode */
set_be_bit(2, data); /* z/Architecture */
set_be_bit(138, data); /* Configuration-z-architectural-mode */
}
break;
case S390_FEAT_TYPE_PTFF:
@ -357,7 +357,7 @@ void s390_fill_feat_block(const S390FeatBitmap features, S390FeatType type,
case S390_FEAT_TYPE_PCC:
case S390_FEAT_TYPE_PPNO:
case S390_FEAT_TYPE_KMA:
data[0] |= 0x80; /* query is always available */
set_be_bit(0, data); /* query is always available */
break;
default:
break;
@ -368,7 +368,7 @@ void s390_fill_feat_block(const S390FeatBitmap features, S390FeatType type,
if (s390_features[feat].type == type) {
bit_nr = s390_features[feat].bit;
/* big endian on uint8_t array */
data[bit_nr / 8] |= 0x80 >> (bit_nr % 8);
set_be_bit(bit_nr, data);
}
feat = find_next_bit(features, S390_FEAT_MAX, feat + 1);
}

8
target/s390x/cpu_features.h
View file

@ -93,4 +93,12 @@ const S390FeatGroupDef *s390_feat_group_def(S390FeatGroup group);
#define BE_BIT_NR(BIT) (BIT ^ (BITS_PER_LONG - 1))
static inline void set_be_bit(unsigned int bit_nr, uint8_t *array)
{
array[bit_nr / 8] |= 0x80 >> (bit_nr % 8);
}
static inline bool test_be_bit(unsigned int bit_nr, const uint8_t *array)
{
return array[bit_nr / 8] & (0x80 >> (bit_nr % 8));
}
#endif /* TARGET_S390X_CPU_FEATURES_H */

14
target/s390x/kvm.c
View file

@ -2430,16 +2430,6 @@ int kvm_arch_msi_data_to_gsi(uint32_t data)
abort();
}
static inline int test_bit_inv(long nr, const unsigned long *addr)
{
return test_bit(BE_BIT_NR(nr), addr);
}
static inline void set_bit_inv(long nr, unsigned long *addr)
{
set_bit(BE_BIT_NR(nr), addr);
}
static int query_cpu_subfunc(S390FeatBitmap features)
{
struct kvm_s390_vm_cpu_subfunc prop;
@ -2566,7 +2556,7 @@ static int query_cpu_feat(S390FeatBitmap features)
}
for (i = 0; i < ARRAY_SIZE(kvm_to_feat); i++) {
if (test_bit_inv(kvm_to_feat[i][0], (unsigned long *)prop.feat)) {
if (test_be_bit(kvm_to_feat[i][0], (uint8_t *) prop.feat)) {
set_bit(kvm_to_feat[i][1], features);
}
}
@ -2585,7 +2575,7 @@ static int configure_cpu_feat(const S390FeatBitmap features)
for (i = 0; i < ARRAY_SIZE(kvm_to_feat); i++) {
if (test_bit(kvm_to_feat[i][1], features)) {
set_bit_inv(kvm_to_feat[i][0], (unsigned long *)prop.feat);
set_be_bit(kvm_to_feat[i][0], (uint8_t *) prop.feat);
}
}
return kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);