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2e83913 |
Support host/guest notifiers in virtio-pci.
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2e83913 |
The last one only with kvm, that's okay
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because vhost relies on kvm anyway.
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2e83913 |
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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---
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hw/virtio-pci.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
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1 files changed, 62 insertions(+), 0 deletions(-)
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diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
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index 05898c8..c454093 100644
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--- a/hw/virtio-pci.c
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+++ b/hw/virtio-pci.c
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@@ -23,6 +23,7 @@
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#include "msix.h"
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#include "net.h"
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#include "loader.h"
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+#include "kvm.h"
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/* from Linux's linux/virtio_pci.h */
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@@ -394,6 +395,65 @@ static unsigned virtio_pci_get_features(void *opaque)
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return proxy->host_features;
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}
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+static void virtio_pci_guest_notifier_read(void *opaque)
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+{
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+ VirtQueue *vq = opaque;
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+ EventNotifier *n = virtio_queue_guest_notifier(vq);
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+ if (event_notifier_test_and_clear(n)) {
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+ virtio_irq(vq);
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+ }
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+}
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+
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+static int virtio_pci_guest_notifier(void *opaque, int n, bool assign)
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+{
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+ VirtIOPCIProxy *proxy = opaque;
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+ VirtQueue *vq = virtio_queue(proxy->vdev, n);
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+ EventNotifier *notifier = virtio_queue_guest_notifier(vq);
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+
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+ if (assign) {
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+ int r = event_notifier_init(notifier, 0);
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+ if (r < 0)
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+ return r;
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+ qemu_set_fd_handler(event_notifier_get_fd(notifier),
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+ virtio_pci_guest_notifier_read, NULL, vq);
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+ } else {
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+ qemu_set_fd_handler(event_notifier_get_fd(notifier),
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+ NULL, NULL, vq);
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+ event_notifier_cleanup(notifier);
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+ }
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+
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+ return 0;
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+}
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+
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+static int virtio_pci_host_notifier(void *opaque, int n, bool assign)
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+{
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+ VirtIOPCIProxy *proxy = opaque;
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+ VirtQueue *vq = virtio_queue(proxy->vdev, n);
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+ EventNotifier *notifier = virtio_queue_host_notifier(vq);
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+ int r;
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+ if (assign) {
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+ r = event_notifier_init(notifier, 1);
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+ if (r < 0) {
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+ return r;
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+ }
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+ r = kvm_set_ioeventfd(proxy->addr + VIRTIO_PCI_QUEUE_NOTIFY,
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+ n, event_notifier_get_fd(notifier),
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+ assign);
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+ if (r < 0) {
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+ event_notifier_cleanup(notifier);
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+ }
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+ } else {
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+ r = kvm_set_ioeventfd(proxy->addr + VIRTIO_PCI_QUEUE_NOTIFY,
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+ n, event_notifier_get_fd(notifier),
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+ assign);
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+ if (r < 0) {
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+ return r;
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+ }
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+ event_notifier_cleanup(notifier);
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+ }
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+ return r;
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+}
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+
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static const VirtIOBindings virtio_pci_bindings = {
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.notify = virtio_pci_notify,
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.save_config = virtio_pci_save_config,
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@@ -401,6 +461,8 @@ static const VirtIOBindings virtio_pci_bindings = {
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.save_queue = virtio_pci_save_queue,
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.load_queue = virtio_pci_load_queue,
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.get_features = virtio_pci_get_features,
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+ .host_notifier = virtio_pci_host_notifier,
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+ .guest_notifier = virtio_pci_guest_notifier,
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};
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static void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev,
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--
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2e83913 |
1.6.6.144.g5c3af
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