diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/hw/virtio/virtio-features.h | 126 | ||||
| -rw-r--r-- | include/hw/virtio/virtio.h | 7 |
2 files changed, 130 insertions, 3 deletions
diff --git a/include/hw/virtio/virtio-features.h b/include/hw/virtio/virtio-features.h new file mode 100644 index 0000000000..e29b7fe48f --- /dev/null +++ b/include/hw/virtio/virtio-features.h @@ -0,0 +1,126 @@ +/* + * 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 diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h index c594764f23..39e4059a66 100644 --- a/include/hw/virtio/virtio.h +++ b/include/hw/virtio/virtio.h @@ -16,6 +16,7 @@ #include "system/memory.h" #include "hw/qdev-core.h" +#include "hw/virtio/virtio-features.h" #include "net/net.h" #include "migration/vmstate.h" #include "qemu/event_notifier.h" @@ -121,9 +122,9 @@ struct VirtIODevice * backend (e.g. vhost) and could potentially be a subset of the * total feature set offered by QEMU. */ - uint64_t host_features; - uint64_t guest_features; - uint64_t backend_features; + VIRTIO_DECLARE_FEATURES(host_features); + VIRTIO_DECLARE_FEATURES(guest_features); + VIRTIO_DECLARE_FEATURES(backend_features); size_t config_len; void *config; |