summaryrefslogtreecommitdiff
path: root/hw/virtio-pci.c
diff options
context:
space:
mode:
authorMichael S. Tsirkin <mst@redhat.com>2010-03-17 13:08:13 +0200
committerAnthony Liguori <aliguori@us.ibm.com>2010-04-01 13:56:43 -0500
commitade80dc84527ae7418e9fcaf33e09574da0d2b29 (patch)
tree175f39beec59b3253ae0fcc9ad0abbc048ca1a1d /hw/virtio-pci.c
parent2be24aaafe1a5da1cd78b4ef8442af29dd0083a7 (diff)
virtio-pci: fill in notifier support
Support host/guest notifiers in virtio-pci. The last one only with kvm, that's okay because vhost relies on kvm anyway. Note on kvm usage: kvm ioeventfd API is implemented on non-kvm systems as well, this is the reason we don't need if (kvm_enabled()) around it. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'hw/virtio-pci.c')
-rw-r--r--hw/virtio-pci.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index a8b15bd464..7ce526f42c 100644
--- a/hw/virtio-pci.c
+++ b/hw/virtio-pci.c
@@ -24,6 +24,7 @@
#include "net.h"
#include "block_int.h"
#include "loader.h"
+#include "kvm.h"
/* from Linux's linux/virtio_pci.h */
@@ -415,6 +416,66 @@ static unsigned virtio_pci_get_features(void *opaque)
return proxy->host_features;
}
+static void virtio_pci_guest_notifier_read(void *opaque)
+{
+ VirtQueue *vq = opaque;
+ EventNotifier *n = virtio_queue_get_guest_notifier(vq);
+ if (event_notifier_test_and_clear(n)) {
+ virtio_irq(vq);
+ }
+}
+
+static int virtio_pci_set_guest_notifier(void *opaque, int n, bool assign)
+{
+ VirtIOPCIProxy *proxy = opaque;
+ VirtQueue *vq = virtio_get_queue(proxy->vdev, n);
+ EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
+
+ if (assign) {
+ int r = event_notifier_init(notifier, 0);
+ if (r < 0) {
+ return r;
+ }
+ qemu_set_fd_handler(event_notifier_get_fd(notifier),
+ virtio_pci_guest_notifier_read, NULL, vq);
+ } else {
+ qemu_set_fd_handler(event_notifier_get_fd(notifier),
+ NULL, NULL, NULL);
+ event_notifier_cleanup(notifier);
+ }
+
+ return 0;
+}
+
+static int virtio_pci_set_host_notifier(void *opaque, int n, bool assign)
+{
+ VirtIOPCIProxy *proxy = opaque;
+ VirtQueue *vq = virtio_get_queue(proxy->vdev, n);
+ EventNotifier *notifier = virtio_queue_get_host_notifier(vq);
+ int r;
+ if (assign) {
+ r = event_notifier_init(notifier, 1);
+ if (r < 0) {
+ return r;
+ }
+ r = kvm_set_ioeventfd_pio_word(event_notifier_get_fd(notifier),
+ proxy->addr + VIRTIO_PCI_QUEUE_NOTIFY,
+ n, assign);
+ if (r < 0) {
+ event_notifier_cleanup(notifier);
+ }
+ } else {
+ r = kvm_set_ioeventfd_pio_word(event_notifier_get_fd(notifier),
+ proxy->addr + VIRTIO_PCI_QUEUE_NOTIFY,
+ n, assign);
+ if (r < 0) {
+ return r;
+ }
+ event_notifier_cleanup(notifier);
+ }
+ return r;
+}
+
static const VirtIOBindings virtio_pci_bindings = {
.notify = virtio_pci_notify,
.save_config = virtio_pci_save_config,
@@ -422,6 +483,8 @@ static const VirtIOBindings virtio_pci_bindings = {
.save_queue = virtio_pci_save_queue,
.load_queue = virtio_pci_load_queue,
.get_features = virtio_pci_get_features,
+ .set_host_notifier = virtio_pci_set_host_notifier,
+ .set_guest_notifier = virtio_pci_set_guest_notifier,
};
static void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev,