Michael S. Tsirkin
2011-May-04 21:01 UTC
[PATCH 0/3] virtio-net: 64 bit features, event index
OK, here's a patch that implements the virtio spec update that I sent earlier. It supercedes the PUBLISH_USED_IDX patches I sent out earlier. Support is added in both userspace and vhost-net. I see nice performance improvements: e.g. from 12 to 18 Gbit/s host to guest with netperf, but did not spend a lot of time testing performance. I hope others will try this out and report. Note: there are 2 new features, reducing the number of interrupts (used_event) and of exits (avail_event). If you see issues or are just curious, you can turn them off separately. For example: -global virtio-net-pci.avail_event=on -global virtio-net-pci.used_event=on -global virtio-blk-pci.avail_event=off -global virtio-blk-pci.used_event=off Also, it's possible to try both vhost-net and virtio-net. Michael S. Tsirkin (3): virtio/vhost: support 64 bit features virtio+vhost: used_event feature virtio: avail_event index support hw/qdev-properties.c | 39 +++++++++++++--- hw/qdev.h | 10 ++++ hw/s390-virtio-bus.c | 5 +- hw/s390-virtio-bus.h | 2 +- hw/syborg_virtio.c | 7 ++- hw/vhost_net.c | 20 +++++++-- hw/vhost_net.h | 4 +- hw/virtio-9p.c | 2 +- hw/virtio-balloon.c | 2 +- hw/virtio-blk.c | 2 +- hw/virtio-blk.h | 2 +- hw/virtio-net.c | 11 +++-- hw/virtio-net.h | 34 +++++++------- hw/virtio-pci.c | 91 +++++++++++++++++++++++++++---------- hw/virtio-serial-bus.c | 2 +- hw/virtio.c | 116 ++++++++++++++++++++++++++++++++++++++++++------ hw/virtio.h | 27 ++++++++--- 17 files changed, 284 insertions(+), 92 deletions(-) -- 1.7.5.53.gc233e
Michael S. Tsirkin
2011-May-04 21:01 UTC
[PATCH 1/3] virtio/vhost: support 64 bit features
Add support for extended feature bits: up to 64 bit.
Only virtio-pci is actually implemented,
s390 and syborg are stubbed out (and untested).
Signed-off-by: Michael S. Tsirkin <mst at redhat.com>
---
hw/qdev-properties.c | 39 ++++++++++++++++----
hw/qdev.h | 10 +++++
hw/s390-virtio-bus.c | 5 ++-
hw/s390-virtio-bus.h | 2 +-
hw/syborg_virtio.c | 7 ++--
hw/vhost_net.c | 8 ++--
hw/vhost_net.h | 4 +-
hw/virtio-9p.c | 2 +-
hw/virtio-balloon.c | 2 +-
hw/virtio-blk.c | 2 +-
hw/virtio-blk.h | 2 +-
hw/virtio-net.c | 11 +++---
hw/virtio-net.h | 34 +++++++++---------
hw/virtio-pci.c | 91 +++++++++++++++++++++++++++++++++++-------------
hw/virtio-serial-bus.c | 2 +-
hw/virtio.c | 24 ++++++++++---
hw/virtio.h | 17 +++++----
17 files changed, 179 insertions(+), 83 deletions(-)
diff --git a/hw/qdev-properties.c b/hw/qdev-properties.c
index 1088a26..a933c9e 100644
--- a/hw/qdev-properties.c
+++ b/hw/qdev-properties.c
@@ -10,20 +10,35 @@ void *qdev_get_prop_ptr(DeviceState *dev, Property *prop)
return ptr;
}
-static uint32_t qdev_get_prop_mask(Property *prop)
+static uint64_t qdev_get_prop_mask(Property *prop)
{
assert(prop->info->type == PROP_TYPE_BIT);
- return 0x1 << prop->bitnr;
+ return 0x1ULL << prop->bitnr;
+}
+
+static uint64_t qdev_get_prop_val(DeviceState *dev, Property *prop)
+{
+ assert(prop->info->type == PROP_TYPE_BIT);
+ if (prop->info->size == sizeof(uint32_t)) {
+ return *(uint32_t *)qdev_get_prop_ptr(dev, prop);
+ } else {
+ return *(uint64_t *)qdev_get_prop_ptr(dev, prop);
+ }
}
static void bit_prop_set(DeviceState *dev, Property *props, bool val)
{
- uint32_t *p = qdev_get_prop_ptr(dev, props);
- uint32_t mask = qdev_get_prop_mask(props);
+ uint64_t p = qdev_get_prop_val(dev, props);
+ uint64_t mask = qdev_get_prop_mask(props);
if (val)
- *p |= mask;
+ p |= mask;
else
- *p &= ~mask;
+ p &= ~mask;
+ if (props->info->size == sizeof(uint32_t)) {
+ *(uint32_t *)qdev_get_prop_ptr(dev, props) = p;
+ } else {
+ *(uint64_t *)qdev_get_prop_ptr(dev, props) = p;
+ }
}
static void qdev_prop_cpy(DeviceState *dev, Property *props, void *src)
@@ -51,8 +66,8 @@ static int parse_bit(DeviceState *dev, Property *prop, const
char *str)
static int print_bit(DeviceState *dev, Property *prop, char *dest, size_t len)
{
- uint32_t *p = qdev_get_prop_ptr(dev, prop);
- return snprintf(dest, len, (*p & qdev_get_prop_mask(prop)) ?
"on" : "off");
+ uint64_t val = qdev_get_prop_val(dev, prop);
+ return snprintf(dest, len, (val & qdev_get_prop_mask(prop)) ?
"on" : "off");
}
PropertyInfo qdev_prop_bit = {
@@ -63,6 +78,14 @@ PropertyInfo qdev_prop_bit = {
.print = print_bit,
};
+PropertyInfo qdev_prop_bit64 = {
+ .name = "on/off",
+ .type = PROP_TYPE_BIT,
+ .size = sizeof(uint64_t),
+ .parse = parse_bit,
+ .print = print_bit,
+};
+
/* --- 8bit integer --- */
static int parse_uint8(DeviceState *dev, Property *prop, const char *str)
diff --git a/hw/qdev.h b/hw/qdev.h
index 8a13ec9..e65cab0 100644
--- a/hw/qdev.h
+++ b/hw/qdev.h
@@ -219,6 +219,7 @@ int do_device_del(Monitor *mon, const QDict *qdict, QObject
**ret_data);
/*** qdev-properties.c ***/
extern PropertyInfo qdev_prop_bit;
+extern PropertyInfo qdev_prop_bit64;
extern PropertyInfo qdev_prop_uint8;
extern PropertyInfo qdev_prop_uint16;
extern PropertyInfo qdev_prop_uint32;
@@ -257,6 +258,15 @@ extern PropertyInfo qdev_prop_pci_devfn;
.defval = (bool[]) { (_defval) }, \
}
+#define DEFINE_PROP_BIT64(_name, _state, _field, _bit, _defval) { \
+ .name = (_name), \
+ .info = &(qdev_prop_bit64), \
+ .bitnr = (_bit), \
+ .offset = offsetof(_state, _field) \
+ + type_check(uint64_t,typeof_field(_state, _field)), \
+ .defval = (bool[]) { (_defval) }, \
+ }
+
#define DEFINE_PROP_UINT8(_n, _s, _f, _d) \
DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_uint8, uint8_t)
#define DEFINE_PROP_UINT16(_n, _s, _f, _d) \
diff --git a/hw/s390-virtio-bus.c b/hw/s390-virtio-bus.c
index 175e5cb..89e8c8e 100644
--- a/hw/s390-virtio-bus.c
+++ b/hw/s390-virtio-bus.c
@@ -310,10 +310,11 @@ static void virtio_s390_notify(void *opaque, uint16_t
vector)
kvm_s390_virtio_irq(s390_cpu_addr2state(0), 0, token);
}
-static unsigned virtio_s390_get_features(void *opaque)
+static uint64_t virtio_s390_get_features(void *opaque)
{
VirtIOS390Device *dev = (VirtIOS390Device*)opaque;
- return dev->host_features;
+ /* TODO: support high 32 bit features */
+ return dev->host_features & 0xFFFFFFFFULL;
}
/**************** S390 Virtio Bus Device Descriptions *******************/
diff --git a/hw/s390-virtio-bus.h b/hw/s390-virtio-bus.h
index edf6d04..5c851e3 100644
--- a/hw/s390-virtio-bus.h
+++ b/hw/s390-virtio-bus.h
@@ -43,7 +43,7 @@ typedef struct VirtIOS390Device {
VirtIODevice *vdev;
BlockConf block;
NICConf nic;
- uint32_t host_features;
+ uint64_t host_features;
virtio_serial_conf serial;
virtio_net_conf net;
} VirtIOS390Device;
diff --git a/hw/syborg_virtio.c b/hw/syborg_virtio.c
index ee08c49..b64c357 100644
--- a/hw/syborg_virtio.c
+++ b/hw/syborg_virtio.c
@@ -67,7 +67,7 @@ typedef struct {
uint32_t int_enable;
uint32_t id;
NICConf nic;
- uint32_t host_features;
+ uint64_t host_features;
virtio_net_conf net;
} SyborgVirtIOProxy;
@@ -244,10 +244,11 @@ static void syborg_virtio_update_irq(void *opaque,
uint16_t vector)
qemu_set_irq(proxy->irq, level != 0);
}
-static unsigned syborg_virtio_get_features(void *opaque)
+static uint32_t syborg_virtio_get_features(void *opaque)
{
SyborgVirtIOProxy *proxy = opaque;
- return proxy->host_features;
+ /* TODO: support high 32 bit features */
+ return proxy->host_features & 0xFFFFFFFFULL;
}
static VirtIOBindings syborg_virtio_bindings = {
diff --git a/hw/vhost_net.c b/hw/vhost_net.c
index 420e05f..7e94f61 100644
--- a/hw/vhost_net.c
+++ b/hw/vhost_net.c
@@ -41,7 +41,7 @@ struct vhost_net {
VLANClientState *vc;
};
-unsigned vhost_net_get_features(struct vhost_net *net, unsigned features)
+uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
{
/* Clear features not supported by host kernel. */
if (!(net->dev.features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY))) {
@@ -56,7 +56,7 @@ unsigned vhost_net_get_features(struct vhost_net *net,
unsigned features)
return features;
}
-void vhost_net_ack_features(struct vhost_net *net, unsigned features)
+void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
{
net->dev.acked_features = net->dev.backend_features;
if (features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) {
@@ -219,11 +219,11 @@ void vhost_net_cleanup(struct vhost_net *net)
{
}
-unsigned vhost_net_get_features(struct vhost_net *net, unsigned features)
+uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
{
return features;
}
-void vhost_net_ack_features(struct vhost_net *net, unsigned features)
+void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
{
}
#endif
diff --git a/hw/vhost_net.h b/hw/vhost_net.h
index 91e40b1..4069258 100644
--- a/hw/vhost_net.h
+++ b/hw/vhost_net.h
@@ -14,7 +14,7 @@ void vhost_net_stop(VHostNetState *net, VirtIODevice *dev);
void vhost_net_cleanup(VHostNetState *net);
-unsigned vhost_net_get_features(VHostNetState *net, unsigned features);
-void vhost_net_ack_features(VHostNetState *net, unsigned features);
+uint64_t vhost_net_get_features(VHostNetState *net, uint64_t features);
+void vhost_net_ack_features(VHostNetState *net, uint64_t features);
#endif
diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c
index 7e29535..184691a 100644
--- a/hw/virtio-9p.c
+++ b/hw/virtio-9p.c
@@ -3624,7 +3624,7 @@ static void handle_9p_output(VirtIODevice *vdev, VirtQueue
*vq)
free_pdu(s, pdu);
}
-static uint32_t virtio_9p_get_features(VirtIODevice *vdev, uint32_t features)
+static uint64_t virtio_9p_get_features(VirtIODevice *vdev, uint64_t features)
{
features |= 1 << VIRTIO_9P_MOUNT_TAG;
return features;
diff --git a/hw/virtio-balloon.c b/hw/virtio-balloon.c
index f9add1c..b34adc1 100644
--- a/hw/virtio-balloon.c
+++ b/hw/virtio-balloon.c
@@ -195,7 +195,7 @@ static void virtio_balloon_set_config(VirtIODevice *vdev,
dev->actual = le32_to_cpu(config.actual);
}
-static uint32_t virtio_balloon_get_features(VirtIODevice *vdev, uint32_t f)
+static uint64_t virtio_balloon_get_features(VirtIODevice *vdev, uint64_t f)
{
f |= (1 << VIRTIO_BALLOON_F_STATS_VQ);
return f;
diff --git a/hw/virtio-blk.c b/hw/virtio-blk.c
index 91e0394..442ce11 100644
--- a/hw/virtio-blk.c
+++ b/hw/virtio-blk.c
@@ -466,7 +466,7 @@ static void virtio_blk_update_config(VirtIODevice *vdev,
uint8_t *config)
memcpy(config, &blkcfg, sizeof(struct virtio_blk_config));
}
-static uint32_t virtio_blk_get_features(VirtIODevice *vdev, uint32_t features)
+static uint64_t virtio_blk_get_features(VirtIODevice *vdev, uint64_t features)
{
VirtIOBlock *s = to_virtio_blk(vdev);
diff --git a/hw/virtio-blk.h b/hw/virtio-blk.h
index fff46da..61104ea 100644
--- a/hw/virtio-blk.h
+++ b/hw/virtio-blk.h
@@ -98,7 +98,7 @@ struct virtio_scsi_inhdr
#ifdef __linux__
#define DEFINE_VIRTIO_BLK_FEATURES(_state, _field) \
DEFINE_VIRTIO_COMMON_FEATURES(_state, _field), \
- DEFINE_PROP_BIT("scsi", _state, _field, VIRTIO_BLK_F_SCSI,
true)
+ DEFINE_PROP_BIT64("scsi", _state, _field, VIRTIO_BLK_F_SCSI,
true)
#else
#define DEFINE_VIRTIO_BLK_FEATURES(_state, _field) \
DEFINE_VIRTIO_COMMON_FEATURES(_state, _field)
diff --git a/hw/virtio-net.c b/hw/virtio-net.c
index 6997e02..c242fd1 100644
--- a/hw/virtio-net.c
+++ b/hw/virtio-net.c
@@ -223,7 +223,7 @@ static int peer_has_ufo(VirtIONet *n)
return n->has_ufo;
}
-static uint32_t virtio_net_get_features(VirtIODevice *vdev, uint32_t features)
+static uint64_t virtio_net_get_features(VirtIODevice *vdev, uint64_t features)
{
VirtIONet *n = to_virtio_net(vdev);
@@ -258,9 +258,9 @@ static uint32_t virtio_net_get_features(VirtIODevice *vdev,
uint32_t features)
return vhost_net_get_features(tap_get_vhost_net(n->nic->nc.peer),
features);
}
-static uint32_t virtio_net_bad_features(VirtIODevice *vdev)
+static uint64_t virtio_net_bad_features(VirtIODevice *vdev)
{
- uint32_t features = 0;
+ uint64_t features = 0;
/* Linux kernel 2.6.25. It understood MAC (as everyone must),
* but also these: */
@@ -273,7 +273,7 @@ static uint32_t virtio_net_bad_features(VirtIODevice *vdev)
return features;
}
-static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features)
+static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features)
{
VirtIONet *n = to_virtio_net(vdev);
@@ -628,7 +628,8 @@ static ssize_t virtio_net_receive(VLANClientState *nc, const
uint8_t *buf, size_
return -1;
error_report("virtio-net unexpected empty queue: "
"i %zd mergeable %d offset %zd, size %zd, "
- "guest hdr len %zd, host hdr len %zd guest features
0x%x",
+ "guest hdr len %zd, host hdr len %zd "
+ "guest features 0x%" PRIx64,
i, n->mergeable_rx_bufs, offset, size,
guest_hdr_len, host_hdr_len, n->vdev.guest_features);
exit(1);
diff --git a/hw/virtio-net.h b/hw/virtio-net.h
index 8af9a1c..8f8ac7f 100644
--- a/hw/virtio-net.h
+++ b/hw/virtio-net.h
@@ -169,21 +169,21 @@ struct virtio_net_ctrl_mac {
#define DEFINE_VIRTIO_NET_FEATURES(_state, _field) \
DEFINE_VIRTIO_COMMON_FEATURES(_state, _field), \
- DEFINE_PROP_BIT("csum", _state, _field, VIRTIO_NET_F_CSUM,
true), \
- DEFINE_PROP_BIT("guest_csum", _state, _field,
VIRTIO_NET_F_GUEST_CSUM, true), \
- DEFINE_PROP_BIT("gso", _state, _field, VIRTIO_NET_F_GSO,
true), \
- DEFINE_PROP_BIT("guest_tso4", _state, _field,
VIRTIO_NET_F_GUEST_TSO4, true), \
- DEFINE_PROP_BIT("guest_tso6", _state, _field,
VIRTIO_NET_F_GUEST_TSO6, true), \
- DEFINE_PROP_BIT("guest_ecn", _state, _field,
VIRTIO_NET_F_GUEST_ECN, true), \
- DEFINE_PROP_BIT("guest_ufo", _state, _field,
VIRTIO_NET_F_GUEST_UFO, true), \
- DEFINE_PROP_BIT("host_tso4", _state, _field,
VIRTIO_NET_F_HOST_TSO4, true), \
- DEFINE_PROP_BIT("host_tso6", _state, _field,
VIRTIO_NET_F_HOST_TSO6, true), \
- DEFINE_PROP_BIT("host_ecn", _state, _field,
VIRTIO_NET_F_HOST_ECN, true), \
- DEFINE_PROP_BIT("host_ufo", _state, _field,
VIRTIO_NET_F_HOST_UFO, true), \
- DEFINE_PROP_BIT("mrg_rxbuf", _state, _field,
VIRTIO_NET_F_MRG_RXBUF, true), \
- DEFINE_PROP_BIT("status", _state, _field,
VIRTIO_NET_F_STATUS, true), \
- DEFINE_PROP_BIT("ctrl_vq", _state, _field,
VIRTIO_NET_F_CTRL_VQ, true), \
- DEFINE_PROP_BIT("ctrl_rx", _state, _field,
VIRTIO_NET_F_CTRL_RX, true), \
- DEFINE_PROP_BIT("ctrl_vlan", _state, _field,
VIRTIO_NET_F_CTRL_VLAN, true), \
- DEFINE_PROP_BIT("ctrl_rx_extra", _state, _field,
VIRTIO_NET_F_CTRL_RX_EXTRA, true)
+ DEFINE_PROP_BIT64("csum", _state, _field, VIRTIO_NET_F_CSUM,
true), \
+ DEFINE_PROP_BIT64("guest_csum", _state, _field,
VIRTIO_NET_F_GUEST_CSUM, true), \
+ DEFINE_PROP_BIT64("gso", _state, _field, VIRTIO_NET_F_GSO,
true), \
+ DEFINE_PROP_BIT64("guest_tso4", _state, _field,
VIRTIO_NET_F_GUEST_TSO4, true), \
+ DEFINE_PROP_BIT64("guest_tso6", _state, _field,
VIRTIO_NET_F_GUEST_TSO6, true), \
+ DEFINE_PROP_BIT64("guest_ecn", _state, _field,
VIRTIO_NET_F_GUEST_ECN, true), \
+ DEFINE_PROP_BIT64("guest_ufo", _state, _field,
VIRTIO_NET_F_GUEST_UFO, true), \
+ DEFINE_PROP_BIT64("host_tso4", _state, _field,
VIRTIO_NET_F_HOST_TSO4, true), \
+ DEFINE_PROP_BIT64("host_tso6", _state, _field,
VIRTIO_NET_F_HOST_TSO6, true), \
+ DEFINE_PROP_BIT64("host_ecn", _state, _field,
VIRTIO_NET_F_HOST_ECN, true), \
+ DEFINE_PROP_BIT64("host_ufo", _state, _field,
VIRTIO_NET_F_HOST_UFO, true), \
+ DEFINE_PROP_BIT64("mrg_rxbuf", _state, _field,
VIRTIO_NET_F_MRG_RXBUF, true), \
+ DEFINE_PROP_BIT64("status", _state, _field,
VIRTIO_NET_F_STATUS, true), \
+ DEFINE_PROP_BIT64("ctrl_vq", _state, _field,
VIRTIO_NET_F_CTRL_VQ, true), \
+ DEFINE_PROP_BIT64("ctrl_rx", _state, _field,
VIRTIO_NET_F_CTRL_RX, true), \
+ DEFINE_PROP_BIT64("ctrl_vlan", _state, _field,
VIRTIO_NET_F_CTRL_VLAN, true), \
+ DEFINE_PROP_BIT64("ctrl_rx_extra", _state, _field,
VIRTIO_NET_F_CTRL_RX_EXTRA, true)
#endif
diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index 5236470..eb86de2 100644
--- a/hw/virtio-pci.c
+++ b/hw/virtio-pci.c
@@ -64,15 +64,28 @@
/* Config space size */
#define VIRTIO_PCI_CONFIG_NOMSI 20
#define VIRTIO_PCI_CONFIG_MSI 24
-#define VIRTIO_PCI_REGION_SIZE(dev) (msix_present(dev) ? \
- VIRTIO_PCI_CONFIG_MSI : \
- VIRTIO_PCI_CONFIG_NOMSI)
+#define VIRTIO_PCI_CONFIG_HI 32
+/* An extended 32-bit r/o bitmask of the features supported by the host */
+#define VIRTIO_PCI_HOST_FEATURES_HI 24
+
+/* An extended 32-bit r/w bitmask of features activated by the guest */
+#define VIRTIO_PCI_GUEST_FEATURES_HI 28
+
+#define VIRTIO_PCI_REGION_SIZE(proxy) (((proxy)->host_features & \
+ (1ULL << VIRTIO_F_FEATURES_HI))
? \
+ VIRTIO_PCI_CONFIG_HI : \
+
(msix_present(&(proxy)->pci_dev) ? \
+ VIRTIO_PCI_CONFIG_MSI : \
+ VIRTIO_PCI_CONFIG_NOMSI))
/* The remaining space is defined by each driver as the per-driver
* configuration space */
-#define VIRTIO_PCI_CONFIG(dev) (msix_enabled(dev) ? \
- VIRTIO_PCI_CONFIG_MSI : \
- VIRTIO_PCI_CONFIG_NOMSI)
+#define VIRTIO_PCI_CONFIG(proxy) (((proxy)->vdev->guest_features
& \
+ (1ULL << VIRTIO_F_FEATURES_HI))
? \
+ VIRTIO_PCI_CONFIG_HI : \
+
(msix_enabled(&(proxy)->pci_dev) ? \
+ VIRTIO_PCI_CONFIG_MSI : \
+ VIRTIO_PCI_CONFIG_NOMSI))
/* Virtio ABI version, if we increment this, we break the guest driver. */
#define VIRTIO_PCI_ABI_VERSION 0
@@ -106,7 +119,7 @@ typedef struct {
uint32_t nvectors;
BlockConf block;
NICConf nic;
- uint32_t host_features;
+ uint64_t host_features;
#ifdef CONFIG_LINUX
V9fsConf fsconf;
#endif
@@ -314,11 +327,22 @@ static void virtio_pci_reset(DeviceState *d)
proxy->flags &= ~VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
}
+static inline uint64_t virtio_replace_hi(uint64_t features, uint32_t hi)
+{
+ return (features & 0xffffffffull) | ((uint64_t)hi) << 32;
+}
+
+static inline uint64_t virtio_replace_lo(uint64_t features, uint32_t lo)
+{
+ return (features & 0xffffffff00000000ull) | lo;
+}
+
static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
{
VirtIOPCIProxy *proxy = opaque;
VirtIODevice *vdev = proxy->vdev;
target_phys_addr_t pa;
+ uint64_t f;
switch (addr) {
case VIRTIO_PCI_GUEST_FEATURES:
@@ -329,9 +353,15 @@ static void virtio_ioport_write(void *opaque, uint32_t
addr, uint32_t val)
else
val = 0;
}
+ /* Clearing VIRTIO_F_FEATURES_HI clears high 32 bit. */
+ if (val & (1ULL << VIRTIO_F_FEATURES_HI)) {
+ f = virtio_replace_lo(vdev->guest_features, val);
+ } else {
+ f = val;
+ }
if (vdev->set_features)
- vdev->set_features(vdev, val);
- vdev->guest_features = val;
+ vdev->set_features(vdev, f);
+ vdev->guest_features = f;
break;
case VIRTIO_PCI_QUEUE_PFN:
pa = (target_phys_addr_t)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT;
@@ -389,6 +419,12 @@ static void virtio_ioport_write(void *opaque, uint32_t
addr, uint32_t val)
val = VIRTIO_NO_VECTOR;
virtio_queue_set_vector(vdev, vdev->queue_sel, val);
break;
+ case VIRTIO_PCI_GUEST_FEATURES_HI:
+ f = virtio_replace_hi(vdev->guest_features, val);
+ if (vdev->set_features)
+ vdev->set_features(vdev, f);
+ vdev->guest_features = f;
+ break;
default:
error_report("%s: unexpected address 0x%x value 0x%x",
__func__, addr, val);
@@ -433,6 +469,11 @@ static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy,
uint32_t addr)
case VIRTIO_MSI_QUEUE_VECTOR:
ret = virtio_queue_vector(vdev, vdev->queue_sel);
break;
+ case VIRTIO_PCI_HOST_FEATURES_HI:
+ ret = proxy->host_features >> 32;
+ break;
+ case VIRTIO_PCI_GUEST_FEATURES_HI:
+ ret = vdev->guest_features >> 32;
default:
break;
}
@@ -443,7 +484,7 @@ static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy,
uint32_t addr)
static uint32_t virtio_pci_config_readb(void *opaque, uint32_t addr)
{
VirtIOPCIProxy *proxy = opaque;
- uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
+ uint32_t config = VIRTIO_PCI_CONFIG(proxy);
addr -= proxy->addr;
if (addr < config)
return virtio_ioport_read(proxy, addr);
@@ -454,7 +495,7 @@ static uint32_t virtio_pci_config_readb(void *opaque,
uint32_t addr)
static uint32_t virtio_pci_config_readw(void *opaque, uint32_t addr)
{
VirtIOPCIProxy *proxy = opaque;
- uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
+ uint32_t config = VIRTIO_PCI_CONFIG(proxy);
addr -= proxy->addr;
if (addr < config)
return virtio_ioport_read(proxy, addr);
@@ -465,7 +506,7 @@ static uint32_t virtio_pci_config_readw(void *opaque,
uint32_t addr)
static uint32_t virtio_pci_config_readl(void *opaque, uint32_t addr)
{
VirtIOPCIProxy *proxy = opaque;
- uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
+ uint32_t config = VIRTIO_PCI_CONFIG(proxy);
addr -= proxy->addr;
if (addr < config)
return virtio_ioport_read(proxy, addr);
@@ -476,7 +517,7 @@ static uint32_t virtio_pci_config_readl(void *opaque,
uint32_t addr)
static void virtio_pci_config_writeb(void *opaque, uint32_t addr, uint32_t val)
{
VirtIOPCIProxy *proxy = opaque;
- uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
+ uint32_t config = VIRTIO_PCI_CONFIG(proxy);
addr -= proxy->addr;
if (addr < config) {
virtio_ioport_write(proxy, addr, val);
@@ -489,7 +530,7 @@ static void virtio_pci_config_writeb(void *opaque, uint32_t
addr, uint32_t val)
static void virtio_pci_config_writew(void *opaque, uint32_t addr, uint32_t val)
{
VirtIOPCIProxy *proxy = opaque;
- uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
+ uint32_t config = VIRTIO_PCI_CONFIG(proxy);
addr -= proxy->addr;
if (addr < config) {
virtio_ioport_write(proxy, addr, val);
@@ -502,7 +543,7 @@ static void virtio_pci_config_writew(void *opaque, uint32_t
addr, uint32_t val)
static void virtio_pci_config_writel(void *opaque, uint32_t addr, uint32_t val)
{
VirtIOPCIProxy *proxy = opaque;
- uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
+ uint32_t config = VIRTIO_PCI_CONFIG(proxy);
addr -= proxy->addr;
if (addr < config) {
virtio_ioport_write(proxy, addr, val);
@@ -517,7 +558,7 @@ static void virtio_map(PCIDevice *pci_dev, int region_num,
{
VirtIOPCIProxy *proxy = container_of(pci_dev, VirtIOPCIProxy, pci_dev);
VirtIODevice *vdev = proxy->vdev;
- unsigned config_len = VIRTIO_PCI_REGION_SIZE(pci_dev) +
vdev->config_len;
+ unsigned config_len = VIRTIO_PCI_REGION_SIZE(proxy) + vdev->config_len;
proxy->addr = addr;
@@ -551,7 +592,7 @@ static void virtio_write_config(PCIDevice *pci_dev, uint32_t
address,
msix_write_config(pci_dev, address, val, len);
}
-static unsigned virtio_pci_get_features(void *opaque)
+static uint64_t virtio_pci_get_features(void *opaque)
{
VirtIOPCIProxy *proxy = opaque;
return proxy->host_features;
@@ -788,13 +829,6 @@ static void virtio_init_pci(VirtIOPCIProxy *proxy,
VirtIODevice *vdev,
proxy->pci_dev.config_write = virtio_write_config;
- size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev) +
vdev->config_len;
- if (size & (size-1))
- size = 1 << qemu_fls(size);
-
- pci_register_bar(&proxy->pci_dev, 0, size,
PCI_BASE_ADDRESS_SPACE_IO,
- virtio_map);
-
if (!kvm_has_many_ioeventfds()) {
proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
}
@@ -803,6 +837,15 @@ static void virtio_init_pci(VirtIOPCIProxy *proxy,
VirtIODevice *vdev,
proxy->host_features |= 0x1 << VIRTIO_F_NOTIFY_ON_EMPTY;
proxy->host_features |= 0x1 << VIRTIO_F_BAD_FEATURE;
proxy->host_features = vdev->get_features(vdev,
proxy->host_features);
+ if (proxy->host_features & 0xffffffff00000000ull) {
+ proxy->host_features |= 0x1ULL << VIRTIO_F_FEATURES_HI;
+ }
+ size = VIRTIO_PCI_REGION_SIZE(proxy) + vdev->config_len;
+ if (size & (size-1))
+ size = 1 << qemu_fls(size);
+
+ pci_register_bar(&proxy->pci_dev, 0, size,
PCI_BASE_ADDRESS_SPACE_IO,
+ virtio_map);
}
static int virtio_blk_init_pci(PCIDevice *pci_dev)
diff --git a/hw/virtio-serial-bus.c b/hw/virtio-serial-bus.c
index 6227379..76acd02 100644
--- a/hw/virtio-serial-bus.c
+++ b/hw/virtio-serial-bus.c
@@ -461,7 +461,7 @@ static void handle_input(VirtIODevice *vdev, VirtQueue *vq)
{
}
-static uint32_t get_features(VirtIODevice *vdev, uint32_t features)
+static uint64_t get_features(VirtIODevice *vdev, uint64_t features)
{
VirtIOSerial *vser;
diff --git a/hw/virtio.c b/hw/virtio.c
index 31bd9e3..b9acbd4 100644
--- a/hw/virtio.c
+++ b/hw/virtio.c
@@ -653,6 +653,8 @@ void virtio_notify_config(VirtIODevice *vdev)
void virtio_save(VirtIODevice *vdev, QEMUFile *f)
{
+ uint32_t guest_features_hi = vdev->guest_features >> 32;
+ uint32_t guest_features_lo = vdev->guest_features;
int i;
if (vdev->binding->save_config)
@@ -661,7 +663,10 @@ void virtio_save(VirtIODevice *vdev, QEMUFile *f)
qemu_put_8s(f, &vdev->status);
qemu_put_8s(f, &vdev->isr);
qemu_put_be16s(f, &vdev->queue_sel);
- qemu_put_be32s(f, &vdev->guest_features);
+ qemu_put_be32s(f, &guest_features_lo);
+ if (guest_features_lo & (1ULL << VIRTIO_F_FEATURES_HI)) {
+ qemu_put_be32s(f, &guest_features_hi);
+ }
qemu_put_be32(f, vdev->config_len);
qemu_put_buffer(f, vdev->config, vdev->config_len);
@@ -687,8 +692,9 @@ void virtio_save(VirtIODevice *vdev, QEMUFile *f)
int virtio_load(VirtIODevice *vdev, QEMUFile *f)
{
int num, i, ret;
- uint32_t features;
- uint32_t supported_features + uint32_t features_hi, features_lo;
+ uint64_t features;
+ uint64_t supported_features
vdev->binding->get_features(vdev->binding_opaque);
if (vdev->binding->load_config) {
@@ -700,9 +706,17 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f)
qemu_get_8s(f, &vdev->status);
qemu_get_8s(f, &vdev->isr);
qemu_get_be16s(f, &vdev->queue_sel);
- qemu_get_be32s(f, &features);
+ qemu_get_be32s(f, &features_lo);
+ if (features_lo & (1ULL << VIRTIO_F_FEATURES_HI)) {
+ qemu_get_be32s(f, &features_hi);
+ } else {
+ features_hi = 0;
+ }
+ features = ((uint64_t)features_hi) << 32 | features_lo;
+
if (features & ~supported_features) {
- error_report("Features 0x%x unsupported. Allowed features:
0x%x",
+ error_report("Features 0x%" PRIx64 " unsupported. "
+ "Allowed features: 0x%" PRIx64,
features, supported_features);
return -1;
}
diff --git a/hw/virtio.h b/hw/virtio.h
index bc72289..9517b97 100644
--- a/hw/virtio.h
+++ b/hw/virtio.h
@@ -49,6 +49,9 @@
/* A guest should never accept this. It implies negotiation is broken. */
#define VIRTIO_F_BAD_FEATURE 30
+/* Enables feature bits 32 to 63 (only really required for virtio_pci). */
+#define VIRTIO_F_FEATURES_HI 31
+
/* from Linux's linux/virtio_ring.h */
/* This marks a buffer as continuing via the next field. */
@@ -93,7 +96,7 @@ typedef struct {
int (*load_config)(void * opaque, QEMUFile *f);
int (*load_queue)(void * opaque, int n, QEMUFile *f);
int (*load_done)(void * opaque, QEMUFile *f);
- unsigned (*get_features)(void * opaque);
+ uint64_t (*get_features)(void * opaque);
bool (*query_guest_notifiers)(void * opaque);
int (*set_guest_notifiers)(void * opaque, bool assigned);
int (*set_host_notifier)(void * opaque, int n, bool assigned);
@@ -110,14 +113,14 @@ struct VirtIODevice
uint8_t status;
uint8_t isr;
uint16_t queue_sel;
- uint32_t guest_features;
+ uint64_t guest_features;
size_t config_len;
void *config;
uint16_t config_vector;
int nvectors;
- uint32_t (*get_features)(VirtIODevice *vdev, uint32_t requested_features);
- uint32_t (*bad_features)(VirtIODevice *vdev);
- void (*set_features)(VirtIODevice *vdev, uint32_t val);
+ uint64_t (*get_features)(VirtIODevice *vdev, uint64_t requested_features);
+ uint64_t (*bad_features)(VirtIODevice *vdev);
+ void (*set_features)(VirtIODevice *vdev, uint64_t val);
void (*get_config)(VirtIODevice *vdev, uint8_t *config);
void (*set_config)(VirtIODevice *vdev, const uint8_t *config);
void (*reset)(VirtIODevice *vdev);
@@ -209,8 +212,8 @@ void virtio_blk_exit(VirtIODevice *vdev);
void virtio_serial_exit(VirtIODevice *vdev);
#define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \
- DEFINE_PROP_BIT("indirect_desc", _state, _field, \
- VIRTIO_RING_F_INDIRECT_DESC, true)
+ DEFINE_PROP_BIT64("indirect_desc", _state, _field, \
+ VIRTIO_RING_F_INDIRECT_DESC, true)
target_phys_addr_t virtio_queue_get_desc_addr(VirtIODevice *vdev, int n);
target_phys_addr_t virtio_queue_get_avail_addr(VirtIODevice *vdev, int n);
--
1.7.5.53.gc233e
Add support for used_event feature, and utilize it to
reduce the number of interrupts for the guest.
Signed-off-by: Michael S. Tsirkin <mst at redhat.com>
---
hw/vhost_net.c | 6 +++++
hw/virtio.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++------
hw/virtio.h | 7 +++++-
3 files changed, 71 insertions(+), 8 deletions(-)
diff --git a/hw/vhost_net.c b/hw/vhost_net.c
index 7e94f61..18e4653 100644
--- a/hw/vhost_net.c
+++ b/hw/vhost_net.c
@@ -50,6 +50,9 @@ uint64_t vhost_net_get_features(struct vhost_net *net,
uint64_t features)
if (!(net->dev.features & (1 << VIRTIO_RING_F_INDIRECT_DESC)))
{
features &= ~(1 << VIRTIO_RING_F_INDIRECT_DESC);
}
+ if (!(net->dev.features & (1ULL <<
VIRTIO_RING_F_USED_EVENT_IDX))) {
+ features &= ~(1ULL << VIRTIO_RING_F_USED_EVENT_IDX);
+ }
if (!(net->dev.features & (1 << VIRTIO_NET_F_MRG_RXBUF))) {
features &= ~(1 << VIRTIO_NET_F_MRG_RXBUF);
}
@@ -65,6 +68,9 @@ void vhost_net_ack_features(struct vhost_net *net, uint64_t
features)
if (features & (1 << VIRTIO_RING_F_INDIRECT_DESC)) {
net->dev.acked_features |= (1 << VIRTIO_RING_F_INDIRECT_DESC);
}
+ if (features & (1ULL << VIRTIO_RING_F_USED_EVENT_IDX)) {
+ net->dev.acked_features |= (1ULL <<
VIRTIO_RING_F_USED_EVENT_IDX);
+ }
if (features & (1 << VIRTIO_NET_F_MRG_RXBUF)) {
net->dev.acked_features |= (1 << VIRTIO_NET_F_MRG_RXBUF);
}
diff --git a/hw/virtio.c b/hw/virtio.c
index b9acbd4..e459093 100644
--- a/hw/virtio.c
+++ b/hw/virtio.c
@@ -72,7 +72,14 @@ struct VirtQueue
VRing vring;
target_phys_addr_t pa;
uint16_t last_avail_idx;
+ /* Last used index value we have signalled on */
+ uint16_t signalled_used;
+
+ /* Last used index value we have signalled on */
+ bool signalled_used_valid;
+
int inuse;
+
uint16_t vector;
void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq);
VirtIODevice *vdev;
@@ -141,6 +148,11 @@ static inline uint16_t vring_avail_ring(VirtQueue *vq, int
i)
return lduw_phys(pa);
}
+static inline uint16_t vring_used_event(VirtQueue *vq)
+{
+ return vring_avail_ring(vq, vq->vring.num);
+}
+
static inline void vring_used_ring_id(VirtQueue *vq, int i, uint32_t val)
{
target_phys_addr_t pa;
@@ -162,11 +174,11 @@ static uint16_t vring_used_idx(VirtQueue *vq)
return lduw_phys(pa);
}
-static inline void vring_used_idx_increment(VirtQueue *vq, uint16_t val)
+static inline void vring_used_idx_set(VirtQueue *vq, uint16_t val)
{
target_phys_addr_t pa;
pa = vq->vring.used + offsetof(VRingUsed, idx);
- stw_phys(pa, vring_used_idx(vq) + val);
+ stw_phys(pa, val);
}
static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask)
@@ -234,11 +246,16 @@ void virtqueue_fill(VirtQueue *vq, const VirtQueueElement
*elem,
void virtqueue_flush(VirtQueue *vq, unsigned int count)
{
+ uint16_t old, new;
/* Make sure buffer is written before we update index. */
wmb();
trace_virtqueue_flush(vq, count);
- vring_used_idx_increment(vq, count);
+ old = vring_used_idx(vq);
+ new = old + count;
+ vring_used_idx_set(vq, new);
vq->inuse -= count;
+ if (unlikely((int16_t)(new - vq->signalled_used) < (uint16_t)(new -
old)))
+ vq->signalled_used_valid = false;
}
void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
@@ -478,6 +495,8 @@ void virtio_reset(void *opaque)
vdev->vq[i].last_avail_idx = 0;
vdev->vq[i].pa = 0;
vdev->vq[i].vector = VIRTIO_NO_VECTOR;
+ vdev->vq[i].signalled_used = 0;
+ vdev->vq[i].signalled_used_valid = false;
}
}
@@ -629,13 +648,45 @@ void virtio_irq(VirtQueue *vq)
virtio_notify_vector(vq->vdev, vq->vector);
}
-void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
+/* Assuming a given event_idx value from the other size, if
+ * we have just incremented index from old to new_idx,
+ * should we trigger an event? */
+static inline int vring_need_event(uint16_t event, uint16_t new, uint16_t old)
+{
+ /* Note: Xen has similar logic for notification hold-off
+ * in include/xen/interface/io/ring.h with req_event and req_prod
+ * corresponding to event_idx + 1 and new respectively.
+ * Note also that req_event and req_prod in Xen start at 1,
+ * event indexes in virtio start at 0. */
+ return (uint16_t)(new - event - 1) < (uint16_t)(new - old);
+}
+
+static bool vring_notify(VirtIODevice *vdev, VirtQueue *vq)
{
+ uint16_t old, new;
+ bool v;
/* Always notify when queue is empty (when feature acknowledge) */
- if ((vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT) &&
- (!(vdev->guest_features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY))
||
- (vq->inuse || vring_avail_idx(vq) != vq->last_avail_idx)))
+ if (((vdev->guest_features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY))
&&
+ !vq->inuse && vring_avail_idx(vq) ==
vq->last_avail_idx)) {
+ return true;
+ }
+
+ if (!(vdev->guest_features & (1ULL <<
VIRTIO_RING_F_USED_EVENT_IDX))) {
+ return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT);
+ }
+
+ v = vq->signalled_used_valid;
+ vq->signalled_used_valid = true;
+ old = vq->signalled_used;
+ new = vq->signalled_used = vring_used_idx(vq);
+ return !v || vring_need_event(vring_used_event(vq), new, old);
+}
+
+void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
+{
+ if (!vring_notify(vdev, vq)) {
return;
+ }
trace_virtio_notify(vdev, vq);
vdev->isr |= 0x01;
@@ -732,6 +783,7 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f)
vdev->vq[i].vring.num = qemu_get_be32(f);
vdev->vq[i].pa = qemu_get_be64(f);
qemu_get_be16s(f, &vdev->vq[i].last_avail_idx);
+ vdev->vq[i].signalled_used_valid = false;
if (vdev->vq[i].pa) {
uint16_t nheads;
diff --git a/hw/virtio.h b/hw/virtio.h
index 9517b97..d765946 100644
--- a/hw/virtio.h
+++ b/hw/virtio.h
@@ -46,6 +46,9 @@
#define VIRTIO_F_NOTIFY_ON_EMPTY 24
/* We support indirect buffer descriptors */
#define VIRTIO_RING_F_INDIRECT_DESC 28
+/* The Guest publishes the used index for which it expects an interrupt
+ * at the end of the avail ring. Host should ignore the avail->flags field.
*/
+#define VIRTIO_RING_F_USED_EVENT_IDX 29
/* A guest should never accept this. It implies negotiation is broken. */
#define VIRTIO_F_BAD_FEATURE 30
@@ -213,7 +216,9 @@ void virtio_serial_exit(VirtIODevice *vdev);
#define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \
DEFINE_PROP_BIT64("indirect_desc", _state, _field, \
- VIRTIO_RING_F_INDIRECT_DESC, true)
+ VIRTIO_RING_F_INDIRECT_DESC, true), \
+ DEFINE_PROP_BIT64("used_event", _state, _field, \
+ VIRTIO_RING_F_USED_EVENT_IDX, true)
target_phys_addr_t virtio_queue_get_desc_addr(VirtIODevice *vdev, int n);
target_phys_addr_t virtio_queue_get_avail_addr(VirtIODevice *vdev, int n);
--
1.7.5.53.gc233e
Reduce the number of exits utilizing the
avail_event feature.
Signed-off-by: Michael S. Tsirkin <mst at redhat.com>
---
hw/vhost_net.c | 6 ++++++
hw/virtio.c | 26 ++++++++++++++++++++++++--
hw/virtio.h | 7 ++++++-
3 files changed, 36 insertions(+), 3 deletions(-)
diff --git a/hw/vhost_net.c b/hw/vhost_net.c
index 18e4653..aeb5a84 100644
--- a/hw/vhost_net.c
+++ b/hw/vhost_net.c
@@ -53,6 +53,9 @@ uint64_t vhost_net_get_features(struct vhost_net *net,
uint64_t features)
if (!(net->dev.features & (1ULL <<
VIRTIO_RING_F_USED_EVENT_IDX))) {
features &= ~(1ULL << VIRTIO_RING_F_USED_EVENT_IDX);
}
+ if (!(net->dev.features & (1ULL <<
VIRTIO_RING_F_AVAIL_EVENT_IDX))) {
+ features &= ~(1ULL << VIRTIO_RING_F_AVAIL_EVENT_IDX);
+ }
if (!(net->dev.features & (1 << VIRTIO_NET_F_MRG_RXBUF))) {
features &= ~(1 << VIRTIO_NET_F_MRG_RXBUF);
}
@@ -71,6 +74,9 @@ void vhost_net_ack_features(struct vhost_net *net, uint64_t
features)
if (features & (1ULL << VIRTIO_RING_F_USED_EVENT_IDX)) {
net->dev.acked_features |= (1ULL <<
VIRTIO_RING_F_USED_EVENT_IDX);
}
+ if (features & (1ULL << VIRTIO_RING_F_AVAIL_EVENT_IDX)) {
+ net->dev.acked_features |= (1ULL <<
VIRTIO_RING_F_AVAIL_EVENT_IDX);
+ }
if (features & (1 << VIRTIO_NET_F_MRG_RXBUF)) {
net->dev.acked_features |= (1 << VIRTIO_NET_F_MRG_RXBUF);
}
diff --git a/hw/virtio.c b/hw/virtio.c
index e459093..6ae5542 100644
--- a/hw/virtio.c
+++ b/hw/virtio.c
@@ -78,6 +78,9 @@ struct VirtQueue
/* Last used index value we have signalled on */
bool signalled_used_valid;
+ /* Notification enabled? */
+ bool notification;
+
int inuse;
uint16_t vector;
@@ -195,12 +198,26 @@ static inline void vring_used_flags_unset_bit(VirtQueue
*vq, int mask)
stw_phys(pa, lduw_phys(pa) & ~mask);
}
+static inline void vring_avail_event(VirtQueue *vq, uint16_t val)
+{
+ target_phys_addr_t pa;
+ if (!vq->notification) {
+ return;
+ }
+ pa = vq->vring.used + offsetof(VRingUsed, ring[vq->vring.num]);
+ stw_phys(pa, val);
+}
+
void virtio_queue_set_notification(VirtQueue *vq, int enable)
{
- if (enable)
+ vq->notification = enable;
+ if (vq->vdev->guest_features & (1ULL <<
VIRTIO_RING_F_AVAIL_EVENT_IDX)) {
+ vring_avail_event(vq, vq->last_avail_idx);
+ } else if (enable) {
vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY);
- else
+ } else {
vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY);
+ }
}
int virtio_queue_ready(VirtQueue *vq)
@@ -412,6 +429,9 @@ int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem)
max = vq->vring.num;
i = head = virtqueue_get_head(vq, vq->last_avail_idx++);
+ if (vq->vdev->guest_features & (1ULL <<
VIRTIO_RING_F_AVAIL_EVENT_IDX)) {
+ vring_avail_event(vq, vq->last_avail_idx);
+ }
if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_INDIRECT) {
if (vring_desc_len(desc_pa, i) % sizeof(VRingDesc)) {
@@ -497,6 +517,7 @@ void virtio_reset(void *opaque)
vdev->vq[i].vector = VIRTIO_NO_VECTOR;
vdev->vq[i].signalled_used = 0;
vdev->vq[i].signalled_used_valid = false;
+ vdev->vq[i].notification = true;
}
}
@@ -784,6 +805,7 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f)
vdev->vq[i].pa = qemu_get_be64(f);
qemu_get_be16s(f, &vdev->vq[i].last_avail_idx);
vdev->vq[i].signalled_used_valid = false;
+ vdev->vq[i].notification = true;
if (vdev->vq[i].pa) {
uint16_t nheads;
diff --git a/hw/virtio.h b/hw/virtio.h
index d765946..8c0923a 100644
--- a/hw/virtio.h
+++ b/hw/virtio.h
@@ -54,6 +54,9 @@
/* Enables feature bits 32 to 63 (only really required for virtio_pci). */
#define VIRTIO_F_FEATURES_HI 31
+/* The Host publishes the avail index for which it expects a kick
+ * at the end of the used ring. Guest should ignore the used->flags field.
*/
+#define VIRTIO_RING_F_AVAIL_EVENT_IDX 32
/* from Linux's linux/virtio_ring.h */
@@ -218,7 +221,9 @@ void virtio_serial_exit(VirtIODevice *vdev);
DEFINE_PROP_BIT64("indirect_desc", _state, _field, \
VIRTIO_RING_F_INDIRECT_DESC, true), \
DEFINE_PROP_BIT64("used_event", _state, _field, \
- VIRTIO_RING_F_USED_EVENT_IDX, true)
+ VIRTIO_RING_F_USED_EVENT_IDX, true), \
+ DEFINE_PROP_BIT64("avail_event", _state, _field, \
+ VIRTIO_RING_F_AVAIL_EVENT_IDX, true)
target_phys_addr_t virtio_queue_get_desc_addr(VirtIODevice *vdev, int n);
target_phys_addr_t virtio_queue_get_avail_addr(VirtIODevice *vdev, int n);
--
1.7.5.53.gc233e
Michael S. Tsirkin
2011-May-04 21:20 UTC
[PATCH 0/3] virtio-net: 64 bit features, event index
On Thu, May 05, 2011 at 12:01:48AM +0300, Michael S. Tsirkin wrote:> OK, here's a patch that implements the virtio spec update that I > sent earlier. It supercedes the PUBLISH_USED_IDX patches > I sent out earlier.Sorry, forgot to mention this is on top of qemu-kvm d16e0f0 . Copy is here: git://git.kernel.org/pub/scm/linux/kernel/git/mst/qemu-kvm.git virtio-net-event-idx-v1 Relevant kernel bits are here: git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git vhost-net-next-event-idx-v1 -- MST
Apparently Analagous Threads
- [PATCH 0/3] virtio-net: 64 bit features, event index
- [PATCHv2 0/2] virtio-net: 64 bit features, event index
- [PATCHv2 0/2] virtio-net: 64 bit features, event index
- [PATCH RFC v5 00/19] qemu: towards virtio-1 host support
- [PATCH RFC v5 00/19] qemu: towards virtio-1 host support