Use ioeventfds to receive notifications of IO events in virtio-net.
Doing so prevents an exit every time we receive/send a packet.
Signed-off-by: Sasha Levin <levinsasha928@xxxxxxxxx>
---
tools/kvm/virtio/net.c | 22 ++++++++++++++++++++++
1 files changed, 22 insertions(+), 0 deletions(-)
diff --git a/tools/kvm/virtio/net.c b/tools/kvm/virtio/net.c
index 3064da6..0e47be5 100644
--- a/tools/kvm/virtio/net.c
+++ b/tools/kvm/virtio/net.c
@@ -8,6 +8,7 @@
#include "kvm/kvm.h"
#include "kvm/pci.h"
#include "kvm/irq.h"
+#include "kvm/ioeventfd.h"
#include <linux/virtio_net.h>
#include <linux/if_tun.h>
@@ -280,6 +281,11 @@ static bool virtio_net_pci_io_out(struct ioport *ioport, struct kvm *kvm, u16 po
return ret;
}
+static void ioevent_callback(struct kvm *kvm, void *param)
+{
+ virtio_net_handle_callback(kvm, (u64)param);
+}
+
static struct ioport_operations virtio_net_io_ops = {
.io_in = virtio_net_pci_io_in,
.io_out = virtio_net_pci_io_out,
@@ -388,6 +394,8 @@ void virtio_net__init(const struct virtio_net_parameters *params)
if (virtio_net__tap_init(params)) {
u8 dev, line, pin;
u16 net_base_addr;
+ u64 i;
+ struct ioevent ioevent;
if (irq__register_device(VIRTIO_ID_NET, &dev, &pin, &line) < 0)
return;
@@ -401,5 +409,19 @@ void virtio_net__init(const struct virtio_net_parameters *params)
pci__register(&pci_header, dev);
virtio_net__io_thread_init(params->kvm);
+
+ for (i = 0; i < VIRTIO_NET_NUM_QUEUES; i++) {
+ ioevent = (struct ioevent) {
+ .start = net_base_addr + VIRTIO_PCI_QUEUE_NOTIFY,
+ .len = sizeof(u16),
+ .ioevent_callback_fn = ioevent_callback,
+ .datamatch = i,
+ .ptr = (void *)i,
+ .kvm = params->kvm,
+ .event_fd = eventfd(0, 0),
+ };
+
+ ioeventfd__add_event(params->kvm, &ioevent);
+ }
}
}
--
1.7.5.rc3
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