Signed-off-by: Ying-Shiuan Pan <[email protected]>
Signed-off-by: Li Liu <[email protected]>
Signed-off-by: Shannon Zhao <[email protected]>
---
hw/virtio/virtio-mmio.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 45 insertions(+), 0 deletions(-)
diff --git a/hw/virtio/virtio-mmio.c b/hw/virtio/virtio-mmio.c
index b741f50..c543e71 100644
--- a/hw/virtio/virtio-mmio.c
+++ b/hw/virtio/virtio-mmio.c
@@ -119,6 +119,42 @@ static int
virtio_mmio_set_host_notifier_internal(VirtIOMMIOProxy *proxy,
return r;
}
+static void virtio_mmio_start_ioeventfd(VirtIOMMIOProxy *proxy)
+{
+ VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
+ int n, r;
+
+ if (proxy->ioeventfd_disabled ||
+ proxy->ioeventfd_started) {
+ return;
+ }
+
+ for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
+ if (!virtio_queue_get_num(vdev, n)) {
+ continue;
+ }
+
+ r = virtio_mmio_set_host_notifier_internal(proxy, n, true, true);
+ if (r < 0) {
+ goto assign_error;
+ }
+ }
+ proxy->ioeventfd_started = true;
+ return;
+
+assign_error:
+ while (--n >= 0) {
+ if (!virtio_queue_get_num(vdev, n)) {
+ continue;
+ }
+
+ r = virtio_mmio_set_host_notifier_internal(proxy, n, false, false);
+ assert(r >= 0);
+ }
+ proxy->ioeventfd_started = false;
+ error_report("%s: failed. Fallback to a userspace (slower).", __func__);
+}
+
static void virtio_mmio_stop_ioeventfd(VirtIOMMIOProxy *proxy)
{
int r;
@@ -317,7 +353,16 @@ static void virtio_mmio_write(void *opaque, hwaddr offset,
uint64_t value,
virtio_update_irq(vdev);
break;
case VIRTIO_MMIO_STATUS:
+ if (!(value & VIRTIO_CONFIG_S_DRIVER_OK)) {
+ virtio_mmio_stop_ioeventfd(proxy);
+ }
+
virtio_set_status(vdev, value & 0xff);
+
+ if (value & VIRTIO_CONFIG_S_DRIVER_OK) {
+ virtio_mmio_start_ioeventfd(proxy);
+ }
+
if (vdev->status == 0) {
virtio_reset(vdev);
}
--
1.7.1
