qemu/qemu-virtio-pci-fill-in-notifier-support.patch
2010-02-09 17:10:07 +00:00

99 lines
2.9 KiB
Diff

Support host/guest notifiers in virtio-pci.
The last one only with kvm, that's okay
because vhost relies on kvm anyway.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
hw/virtio-pci.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 62 insertions(+), 0 deletions(-)
diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index 05898c8..c454093 100644
--- a/hw/virtio-pci.c
+++ b/hw/virtio-pci.c
@@ -23,6 +23,7 @@
#include "msix.h"
#include "net.h"
#include "loader.h"
+#include "kvm.h"
/* from Linux's linux/virtio_pci.h */
@@ -394,6 +395,65 @@ 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_guest_notifier(vq);
+ if (event_notifier_test_and_clear(n)) {
+ virtio_irq(vq);
+ }
+}
+
+static int virtio_pci_guest_notifier(void *opaque, int n, bool assign)
+{
+ VirtIOPCIProxy *proxy = opaque;
+ VirtQueue *vq = virtio_queue(proxy->vdev, n);
+ EventNotifier *notifier = virtio_queue_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, vq);
+ event_notifier_cleanup(notifier);
+ }
+
+ return 0;
+}
+
+static int virtio_pci_host_notifier(void *opaque, int n, bool assign)
+{
+ VirtIOPCIProxy *proxy = opaque;
+ VirtQueue *vq = virtio_queue(proxy->vdev, n);
+ EventNotifier *notifier = virtio_queue_host_notifier(vq);
+ int r;
+ if (assign) {
+ r = event_notifier_init(notifier, 1);
+ if (r < 0) {
+ return r;
+ }
+ r = kvm_set_ioeventfd(proxy->addr + VIRTIO_PCI_QUEUE_NOTIFY,
+ n, event_notifier_get_fd(notifier),
+ assign);
+ if (r < 0) {
+ event_notifier_cleanup(notifier);
+ }
+ } else {
+ r = kvm_set_ioeventfd(proxy->addr + VIRTIO_PCI_QUEUE_NOTIFY,
+ n, event_notifier_get_fd(notifier),
+ 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,
@@ -401,6 +461,8 @@ static const VirtIOBindings virtio_pci_bindings = {
.save_queue = virtio_pci_save_queue,
.load_queue = virtio_pci_load_queue,
.get_features = virtio_pci_get_features,
+ .host_notifier = virtio_pci_host_notifier,
+ .guest_notifier = virtio_pci_guest_notifier,
};
static void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev,
--
1.6.6.144.g5c3af