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virtio: add feature checking helpers 

Add a helper function for checking whether a bit is set in the guest
features for a vdev as well as one that works on a feature bit set.

Convert code that open-coded this: It cleans up the code and makes it
easier to extend the guest feature bits.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Cornelia Huck 2014-12-11 14:25:06 +01:00 committed by Michael S. Tsirkin
parent 0cd09c3a6c
commit ef546f1275
8 changed files with 42 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
hw/block/virtio-blk.c
View File

@ -733,7 +733,6 @@ static uint32_t virtio_blk_get_features(VirtIODevice *vdev, uint32_t features)
static void virtio_blk_set_status(VirtIODevice *vdev, uint8_t status) static void virtio_blk_set_status(VirtIODevice *vdev, uint8_t status)
{ {
VirtIOBlock *s = VIRTIO_BLK(vdev); VirtIOBlock *s = VIRTIO_BLK(vdev);
uint32_t features;
if (s->dataplane && !(status & (VIRTIO_CONFIG_S_DRIVER | if (s->dataplane && !(status & (VIRTIO_CONFIG_S_DRIVER |
VIRTIO_CONFIG_S_DRIVER_OK))) { VIRTIO_CONFIG_S_DRIVER_OK))) {
@ -744,8 +743,6 @@ static void virtio_blk_set_status(VirtIODevice *vdev, uint8_t status)
return; return;
} }
features = vdev->guest_features;
/* A guest that supports VIRTIO_BLK_F_CONFIG_WCE must be able to send /* A guest that supports VIRTIO_BLK_F_CONFIG_WCE must be able to send
* cache flushes. Thus, the "auto writethrough" behavior is never * cache flushes. Thus, the "auto writethrough" behavior is never
* necessary for guests that support the VIRTIO_BLK_F_CONFIG_WCE feature. * necessary for guests that support the VIRTIO_BLK_F_CONFIG_WCE feature.
@ -761,10 +758,10 @@ static void virtio_blk_set_status(VirtIODevice *vdev, uint8_t status)
* *
* s->blk would erroneously be placed in writethrough mode. * s->blk would erroneously be placed in writethrough mode.
*/ */
if (!(features & (1 << VIRTIO_BLK_F_CONFIG_WCE))) { if (!virtio_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE)) {
aio_context_acquire(blk_get_aio_context(s->blk)); aio_context_acquire(blk_get_aio_context(s->blk));
blk_set_enable_write_cache(s->blk, blk_set_enable_write_cache(s->blk,
!!(features & (1 << VIRTIO_BLK_F_WCE))); virtio_has_feature(vdev, VIRTIO_BLK_F_WCE));
aio_context_release(blk_get_aio_context(s->blk)); aio_context_release(blk_get_aio_context(s->blk));
} }
} }

2
hw/char/virtio-serial-bus.c
View File

@ -76,7 +76,7 @@ static VirtIOSerialPort *find_port_by_name(char *name)
static bool use_multiport(VirtIOSerial *vser) static bool use_multiport(VirtIOSerial *vser)
{ {
VirtIODevice *vdev = VIRTIO_DEVICE(vser); VirtIODevice *vdev = VIRTIO_DEVICE(vser);
return vdev->guest_features & (1 << VIRTIO_CONSOLE_F_MULTIPORT); return virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT);
} }
static size_t write_to_port(VirtIOSerialPort *port, static size_t write_to_port(VirtIOSerialPort *port,

23
hw/net/virtio-net.c
View File

@ -86,7 +86,7 @@ static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
memcpy(&netcfg, config, n->config_size); memcpy(&netcfg, config, n->config_size);
if (!(vdev->guest_features >> VIRTIO_NET_F_CTRL_MAC_ADDR & 1) && if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR) &&
memcmp(netcfg.mac, n->mac, ETH_ALEN)) { memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
memcpy(n->mac, netcfg.mac, ETH_ALEN); memcpy(n->mac, netcfg.mac, ETH_ALEN);
qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
@ -305,7 +305,7 @@ static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc)
info->multicast_table = str_list; info->multicast_table = str_list;
info->vlan_table = get_vlan_table(n); info->vlan_table = get_vlan_table(n);
if (!((1 << VIRTIO_NET_F_CTRL_VLAN) & vdev->guest_features)) { if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VLAN)) {
info->vlan = RX_STATE_ALL; info->vlan = RX_STATE_ALL;
} else if (!info->vlan_table) { } else if (!info->vlan_table) {
info->vlan = RX_STATE_NONE; info->vlan = RX_STATE_NONE;
@ -519,9 +519,12 @@ static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features)
VirtIONet *n = VIRTIO_NET(vdev); VirtIONet *n = VIRTIO_NET(vdev);
int i; int i;
virtio_net_set_multiqueue(n, !!(features & (1 << VIRTIO_NET_F_MQ))); virtio_net_set_multiqueue(n,
__virtio_has_feature(features, VIRTIO_NET_F_MQ));
virtio_net_set_mrg_rx_bufs(n, !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF))); virtio_net_set_mrg_rx_bufs(n,
__virtio_has_feature(features,
VIRTIO_NET_F_MRG_RXBUF));
if (n->has_vnet_hdr) { if (n->has_vnet_hdr) {
n->curr_guest_offloads = n->curr_guest_offloads =
@ -538,7 +541,7 @@ static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features)
vhost_net_ack_features(get_vhost_net(nc->peer), features); vhost_net_ack_features(get_vhost_net(nc->peer), features);
} }
if ((1 << VIRTIO_NET_F_CTRL_VLAN) & features) { if (__virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) {
memset(n->vlans, 0, MAX_VLAN >> 3); memset(n->vlans, 0, MAX_VLAN >> 3);
} else { } else {
memset(n->vlans, 0xff, MAX_VLAN >> 3); memset(n->vlans, 0xff, MAX_VLAN >> 3);
@ -585,7 +588,7 @@ static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd,
uint64_t offloads; uint64_t offloads;
size_t s; size_t s;
if (!((1 << VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) & vdev->guest_features)) { if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
return VIRTIO_NET_ERR; return VIRTIO_NET_ERR;
} }
@ -1378,7 +1381,7 @@ static void virtio_net_save_device(VirtIODevice *vdev, QEMUFile *f)
} }
} }
if ((1 << VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) & vdev->guest_features) { if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
qemu_put_be64(f, n->curr_guest_offloads); qemu_put_be64(f, n->curr_guest_offloads);
} }
} }
@ -1486,7 +1489,7 @@ static int virtio_net_load_device(VirtIODevice *vdev, QEMUFile *f,
} }
} }
if ((1 << VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) & vdev->guest_features) { if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
n->curr_guest_offloads = qemu_get_be64(f); n->curr_guest_offloads = qemu_get_be64(f);
} else { } else {
n->curr_guest_offloads = virtio_net_supported_guest_offloads(n); n->curr_guest_offloads = virtio_net_supported_guest_offloads(n);
@ -1513,8 +1516,8 @@ static int virtio_net_load_device(VirtIODevice *vdev, QEMUFile *f,
qemu_get_subqueue(n->nic, i)->link_down = link_down; qemu_get_subqueue(n->nic, i)->link_down = link_down;
} }
if (vdev->guest_features & (0x1 << VIRTIO_NET_F_GUEST_ANNOUNCE) && if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) &&
vdev->guest_features & (0x1 << VIRTIO_NET_F_CTRL_VQ)) { virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) {
n->announce_counter = SELF_ANNOUNCE_ROUNDS; n->announce_counter = SELF_ANNOUNCE_ROUNDS;
timer_mod(n->announce_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL)); timer_mod(n->announce_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL));
} }

8
hw/scsi/virtio-scsi.c
View File

@ -145,7 +145,7 @@ static int virtio_scsi_parse_req(VirtIOSCSIReq *req,
* *
* TODO: always disable this workaround for virtio 1.0 devices. * TODO: always disable this workaround for virtio 1.0 devices.
*/ */
if ((vdev->guest_features & (1 << VIRTIO_F_ANY_LAYOUT)) == 0) { if (!virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT)) {
req_size = req->elem.out_sg[0].iov_len; req_size = req->elem.out_sg[0].iov_len;
resp_size = req->elem.in_sg[0].iov_len; resp_size = req->elem.in_sg[0].iov_len;
} }
@ -749,7 +749,7 @@ static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense)
VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
VirtIODevice *vdev = VIRTIO_DEVICE(s); VirtIODevice *vdev = VIRTIO_DEVICE(s);
if (((vdev->guest_features >> VIRTIO_SCSI_F_CHANGE) & 1) && if (virtio_has_feature(vdev, VIRTIO_SCSI_F_CHANGE) &&
dev->type != TYPE_ROM) { dev->type != TYPE_ROM) {
virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_PARAM_CHANGE, virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_PARAM_CHANGE,
sense.asc | (sense.ascq << 8)); sense.asc | (sense.ascq << 8));
@ -770,7 +770,7 @@ static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev,
blk_op_block_all(sd->conf.blk, s->blocker); blk_op_block_all(sd->conf.blk, s->blocker);
} }
if ((vdev->guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) { if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) {
virtio_scsi_push_event(s, sd, virtio_scsi_push_event(s, sd,
VIRTIO_SCSI_T_TRANSPORT_RESET, VIRTIO_SCSI_T_TRANSPORT_RESET,
VIRTIO_SCSI_EVT_RESET_RESCAN); VIRTIO_SCSI_EVT_RESET_RESCAN);
@ -784,7 +784,7 @@ static void virtio_scsi_hotunplug(HotplugHandler *hotplug_dev, DeviceState *dev,
VirtIOSCSI *s = VIRTIO_SCSI(vdev); VirtIOSCSI *s = VIRTIO_SCSI(vdev);
SCSIDevice *sd = SCSI_DEVICE(dev); SCSIDevice *sd = SCSI_DEVICE(dev);
if ((vdev->guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) { if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) {
virtio_scsi_push_event(s, sd, virtio_scsi_push_event(s, sd,
VIRTIO_SCSI_T_TRANSPORT_RESET, VIRTIO_SCSI_T_TRANSPORT_RESET,
VIRTIO_SCSI_EVT_RESET_REMOVED); VIRTIO_SCSI_EVT_RESET_REMOVED);

10
hw/virtio/dataplane/vring.c
View File

@ -105,7 +105,7 @@ void vring_teardown(Vring *vring, VirtIODevice *vdev, int n)
/* Disable guest->host notifies */ /* Disable guest->host notifies */
void vring_disable_notification(VirtIODevice *vdev, Vring *vring) void vring_disable_notification(VirtIODevice *vdev, Vring *vring)
{ {
if (!(vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX))) { if (!virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) {
vring_set_used_flags(vdev, vring, VRING_USED_F_NO_NOTIFY); vring_set_used_flags(vdev, vring, VRING_USED_F_NO_NOTIFY);
} }
} }
@ -116,7 +116,7 @@ void vring_disable_notification(VirtIODevice *vdev, Vring *vring)
*/ */
bool vring_enable_notification(VirtIODevice *vdev, Vring *vring) bool vring_enable_notification(VirtIODevice *vdev, Vring *vring)
{ {
if (vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX)) { if (virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) {
vring_avail_event(&vring->vr) = vring->vr.avail->idx; vring_avail_event(&vring->vr) = vring->vr.avail->idx;
} else { } else {
vring_clear_used_flags(vdev, vring, VRING_USED_F_NO_NOTIFY); vring_clear_used_flags(vdev, vring, VRING_USED_F_NO_NOTIFY);
@ -135,12 +135,12 @@ bool vring_should_notify(VirtIODevice *vdev, Vring *vring)
* interrupts. */ * interrupts. */
smp_mb(); smp_mb();
if ((vdev->guest_features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) && if (virtio_has_feature(vdev, VIRTIO_F_NOTIFY_ON_EMPTY) &&
unlikely(!vring_more_avail(vdev, vring))) { unlikely(!vring_more_avail(vdev, vring))) {
return true; return true;
} }
if (!(vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX))) { if (!virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) {
return !(vring_get_avail_flags(vdev, vring) & return !(vring_get_avail_flags(vdev, vring) &
VRING_AVAIL_F_NO_INTERRUPT); VRING_AVAIL_F_NO_INTERRUPT);
} }
@ -401,7 +401,7 @@ int vring_pop(VirtIODevice *vdev, Vring *vring,
/* On success, increment avail index. */ /* On success, increment avail index. */
vring->last_avail_idx++; vring->last_avail_idx++;
if (vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX)) { if (virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) {
vring_avail_event(&vring->vr) = vring->last_avail_idx; vring_avail_event(&vring->vr) = vring->last_avail_idx;
} }

2
hw/virtio/virtio-balloon.c
View File

@ -69,7 +69,7 @@ static inline void reset_stats(VirtIOBalloon *dev)
static bool balloon_stats_supported(const VirtIOBalloon *s) static bool balloon_stats_supported(const VirtIOBalloon *s)
{ {
VirtIODevice *vdev = VIRTIO_DEVICE(s); VirtIODevice *vdev = VIRTIO_DEVICE(s);
return vdev->guest_features & (1 << VIRTIO_BALLOON_F_STATS_VQ); return virtio_has_feature(vdev, VIRTIO_BALLOON_F_STATS_VQ);
} }
static bool balloon_stats_enabled(const VirtIOBalloon *s) static bool balloon_stats_enabled(const VirtIOBalloon *s)

10
hw/virtio/virtio.c
View File

@ -217,7 +217,7 @@ static inline void vring_set_avail_event(VirtQueue *vq, uint16_t val)
void virtio_queue_set_notification(VirtQueue *vq, int enable) void virtio_queue_set_notification(VirtQueue *vq, int enable)
{ {
vq->notification = enable; vq->notification = enable;
if (vq->vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX)) { if (virtio_has_feature(vq->vdev, VIRTIO_RING_F_EVENT_IDX)) {
vring_set_avail_event(vq, vring_avail_idx(vq)); vring_set_avail_event(vq, vring_avail_idx(vq));
} else if (enable) { } else if (enable) {
vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY); vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY);
@ -468,7 +468,7 @@ int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem)
max = vq->vring.num; max = vq->vring.num;
i = head = virtqueue_get_head(vq, vq->last_avail_idx++); i = head = virtqueue_get_head(vq, vq->last_avail_idx++);
if (vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX)) { if (virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) {
vring_set_avail_event(vq, vq->last_avail_idx); vring_set_avail_event(vq, vq->last_avail_idx);
} }
@ -826,12 +826,12 @@ static bool vring_notify(VirtIODevice *vdev, VirtQueue *vq)
/* We need to expose used array entries before checking used event. */ /* We need to expose used array entries before checking used event. */
smp_mb(); smp_mb();
/* Always notify when queue is empty (when feature acknowledge) */ /* Always notify when queue is empty (when feature acknowledge) */
if (((vdev->guest_features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) && if (virtio_has_feature(vdev, VIRTIO_F_NOTIFY_ON_EMPTY) &&
!vq->inuse && vring_avail_idx(vq) == vq->last_avail_idx)) { !vq->inuse && vring_avail_idx(vq) == vq->last_avail_idx) {
return true; return true;
} }
if (!(vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX))) { if (!virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) {
return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT); return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT);
} }

11
include/hw/virtio/virtio.h
View File

@ -231,6 +231,17 @@ static inline void virtio_clear_feature(uint32_t *features, unsigned int fbit)
*features &= ~(1 << fbit); *features &= ~(1 << fbit);
} }
static inline bool __virtio_has_feature(uint32_t features, unsigned int fbit)
{
assert(fbit < 32);
return !!(features & (1 << fbit));
}
static inline bool virtio_has_feature(VirtIODevice *vdev, unsigned int fbit)
{
return __virtio_has_feature(vdev->guest_features, fbit);
}
static inline bool virtio_is_big_endian(VirtIODevice *vdev) static inline bool virtio_is_big_endian(VirtIODevice *vdev)
{ {
assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN); assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN);