在 2021/5/26 上午9:06, Jason Wang 写道:
在 2021/5/20 上午12:28, Eugenio Pérez 写道:
So the guest can stop and start net device. It implements the RFC
https://lists.oasis-open.org/archives/virtio-comment/202012/msg00027.html
To stop (as "pause") the device is required to migrate status and vring
addresses between device and SVQ.
This is a WIP commit: as with VIRTIO_F_QUEUE_STATE, is introduced in
virtio_config.h before of even proposing for the kernel, with no feature
flag, and, with no checking in the device. It also needs a modified
vp_vdpa driver that supports to set and retrieve status.
Signed-off-by: Eugenio Pérez <eperezma@xxxxxxxxxx>
---
include/standard-headers/linux/virtio_config.h | 2 ++
hw/net/virtio-net.c | 4 +++-
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/include/standard-headers/linux/virtio_config.h
b/include/standard-headers/linux/virtio_config.h
index 59fad3eb45..b3f6b1365d 100644
--- a/include/standard-headers/linux/virtio_config.h
+++ b/include/standard-headers/linux/virtio_config.h
@@ -40,6 +40,8 @@
#define VIRTIO_CONFIG_S_DRIVER_OK 4
/* Driver has finished configuring features */
#define VIRTIO_CONFIG_S_FEATURES_OK 8
+/* Device is stopped */
+#define VIRTIO_CONFIG_S_DEVICE_STOPPED 32
/* Device entered invalid state, driver must reset it */
#define VIRTIO_CONFIG_S_NEEDS_RESET 0x40
/* We've given up on this device. */
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 96a3cc8357..2d3caea289 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -198,7 +198,9 @@ static bool virtio_net_started(VirtIONet *n,
uint8_t status)
{
VirtIODevice *vdev = VIRTIO_DEVICE(n);
return (status & VIRTIO_CONFIG_S_DRIVER_OK) &&
- (n->status & VIRTIO_NET_S_LINK_UP) && vdev->vm_running;
+ (!(n->status & VIRTIO_CONFIG_S_DEVICE_STOPPED)) &&
+ (n->status & VIRTIO_NET_S_LINK_UP) &&
+ vdev->vm_running;
}
static void virtio_net_announce_notify(VirtIONet *net)
It looks to me this is only the part of pause.
And even for pause, I don't see anything that prevents rx/tx from being
executed? (E.g virtio_net_handle_tx_bh or virtio_net_handle_rx).
Thanks
We still need the resume?
Thanks
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