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virtio-pci: fill in notifier support

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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>
This commit is contained in:
Michael S. Tsirkin 2010-03-17 13:08:13 +02:00 committed by Anthony Liguori
parent 2be24aaafe
commit ade80dc845
1 changed files with 63 additions and 0 deletions
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63
hw/virtio-pci.c
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@ -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,