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/*
* Virtio features helpers
*
* Copyright 2025 Red Hat, Inc.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef QEMU_VIRTIO_FEATURES_H
#define QEMU_VIRTIO_FEATURES_H
#include "qemu/bitops.h"
#define VIRTIO_FEATURES_FMT "%016"PRIx64"%016"PRIx64
#define VIRTIO_FEATURES_PR(f) (f)[1], (f)[0]
#define VIRTIO_FEATURES_MAX 128
#define VIRTIO_FEATURES_BIT(b) BIT_ULL((b) % 64)
#define VIRTIO_FEATURES_U64(b) ((b) / 64)
#define VIRTIO_FEATURES_NU32S (VIRTIO_FEATURES_MAX / 32)
#define VIRTIO_FEATURES_NU64S (VIRTIO_FEATURES_MAX / 64)
#define VIRTIO_DECLARE_FEATURES(name) \
union { \
uint64_t name; \
uint64_t name##_ex[VIRTIO_FEATURES_NU64S]; \
}
#define VIRTIO_DEFINE_PROP_FEATURE(_name, _state, _field, _bit, _defval) \
DEFINE_PROP_BIT64(_name, _state, _field[VIRTIO_FEATURES_U64(_bit)], \
(_bit) % 64, _defval)
static inline void virtio_features_clear(uint64_t *features)
{
memset(features, 0, sizeof(features[0]) * VIRTIO_FEATURES_NU64S);
}
static inline void virtio_features_from_u64(uint64_t *features, uint64_t from)
{
virtio_features_clear(features);
features[0] = from;
}
static inline bool virtio_has_feature_ex(const uint64_t *features,
unsigned int fbit)
{
assert(fbit < VIRTIO_FEATURES_MAX);
return features[VIRTIO_FEATURES_U64(fbit)] & VIRTIO_FEATURES_BIT(fbit);
}
static inline void virtio_add_feature_ex(uint64_t *features,
unsigned int fbit)
{
assert(fbit < VIRTIO_FEATURES_MAX);
features[VIRTIO_FEATURES_U64(fbit)] |= VIRTIO_FEATURES_BIT(fbit);
}
static inline void virtio_clear_feature_ex(uint64_t *features,
unsigned int fbit)
{
assert(fbit < VIRTIO_FEATURES_MAX);
features[VIRTIO_FEATURES_U64(fbit)] &= ~VIRTIO_FEATURES_BIT(fbit);
}
static inline bool virtio_features_equal(const uint64_t *f1,
const uint64_t *f2)
{
return !memcmp(f1, f2, sizeof(uint64_t) * VIRTIO_FEATURES_NU64S);
}
static inline bool virtio_features_use_ex(const uint64_t *features)
{
int i;
for (i = 1; i < VIRTIO_FEATURES_NU64S; ++i) {
if (features[i]) {
return true;
}
}
return false;
}
static inline bool virtio_features_empty(const uint64_t *features)
{
return !virtio_features_use_ex(features) && !features[0];
}
static inline void virtio_features_copy(uint64_t *to, const uint64_t *from)
{
memcpy(to, from, sizeof(to[0]) * VIRTIO_FEATURES_NU64S);
}
static inline bool virtio_features_andnot(uint64_t *to, const uint64_t *f1,
const uint64_t *f2)
{
uint64_t diff = 0;
int i;
for (i = 0; i < VIRTIO_FEATURES_NU64S; i++) {
to[i] = f1[i] & ~f2[i];
diff |= to[i];
}
return diff;
}
static inline void virtio_features_and(uint64_t *to, const uint64_t *f1,
const uint64_t *f2)
{
int i;
for (i = 0; i < VIRTIO_FEATURES_NU64S; i++) {
to[i] = f1[i] & f2[i];
}
}
static inline void virtio_features_or(uint64_t *to, const uint64_t *f1,
const uint64_t *f2)
{
int i;
for (i = 0; i < VIRTIO_FEATURES_NU64S; i++) {
to[i] = f1[i] | f2[i];
}
}
#endif
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