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virtio: make features 64bit wide

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Make features 64bit wide everywhere.

On migration a full 64bit guest_features field is sent if one of the
high bits is set, in addition to the lower 32bit guest_features field
which must stay for compatibility reasons.  That way we send the lower
32 feature bits twice, but the code is simpler because we don't have
to split and compose the 64bit features into two 32bit fields.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Gerd Hoffmann 2015-06-01 10:45:40 +02:00 • committed by Michael S. Tsirkin
parent fdba6d967e
commit 019a3edbb2
11 changed files with 81 additions and 40 deletions
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32
include/hw/virtio/virtio.h
View file

@ -73,8 +73,8 @@ struct VirtIODevice
uint8_t status;
uint8_t isr;
uint16_t queue_sel;
uint32_t guest_features;
uint32_t host_features;
uint64_t guest_features;
uint64_t host_features;
size_t config_len;
void *config;
uint16_t config_vector;
@ -96,8 +96,8 @@ typedef struct VirtioDeviceClass {
/* This is what a VirtioDevice must implement */
DeviceRealize realize;
DeviceUnrealize unrealize;
uint32_t (*get_features)(VirtIODevice *vdev, uint32_t requested_features);
uint32_t (*bad_features)(VirtIODevice *vdev);
uint64_t (*get_features)(VirtIODevice *vdev, uint64_t requested_features);
uint64_t (*bad_features)(VirtIODevice *vdev);
void (*set_features)(VirtIODevice *vdev, uint32_t val);
void (*get_config)(VirtIODevice *vdev, uint8_t *config);
void (*set_config)(VirtIODevice *vdev, const uint8_t *config);
@ -195,12 +195,12 @@ typedef struct VirtIOSCSIConf VirtIOSCSIConf;
typedef struct VirtIORNGConf VirtIORNGConf;
#define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \
DEFINE_PROP_BIT("indirect_desc", _state, _field, \
VIRTIO_RING_F_INDIRECT_DESC, true), \
DEFINE_PROP_BIT("event_idx", _state, _field, \
VIRTIO_RING_F_EVENT_IDX, true), \
DEFINE_PROP_BIT("notify_on_empty", _state, _field, \
VIRTIO_F_NOTIFY_ON_EMPTY, true)
DEFINE_PROP_BIT64("indirect_desc", _state, _field, \
VIRTIO_RING_F_INDIRECT_DESC, true), \
DEFINE_PROP_BIT64("event_idx", _state, _field, \
VIRTIO_RING_F_EVENT_IDX, true), \
DEFINE_PROP_BIT64("notify_on_empty", _state, _field, \
VIRTIO_F_NOTIFY_ON_EMPTY, true)
hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n);
hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n);
@ -227,21 +227,21 @@ void virtio_irq(VirtQueue *vq);
VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector);
VirtQueue *virtio_vector_next_queue(VirtQueue *vq);
static inline void virtio_add_feature(uint32_t *features, unsigned int fbit)
static inline void virtio_add_feature(uint64_t *features, unsigned int fbit)
{
assert(fbit < 32);
assert(fbit < 64);
*features |= (1 << fbit);
}
static inline void virtio_clear_feature(uint32_t *features, unsigned int fbit)
static inline void virtio_clear_feature(uint64_t *features, unsigned int fbit)
{
assert(fbit < 32);
assert(fbit < 64);
*features &= ~(1 << fbit);
}
static inline bool __virtio_has_feature(uint32_t features, unsigned int fbit)
static inline bool __virtio_has_feature(uint64_t features, unsigned int fbit)
{
assert(fbit < 32);
assert(fbit < 64);
return !!(features & (1 << fbit));
}