Re: [PATCH v2 3/4] kvm tools: Use ioeventfd in virtio-net

[Ingo Molnar <mingo@elte.hu>]

* Sasha Levin <levinsasha928@gmail.com> wrote:

> Use ioeventfds to receive notifications of IO events in virtio-net.
> Doing so prevents an exit every time we receive/send a packet.
> 
> Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
> ---
>  tools/kvm/virtio/net.c |   22 ++++++++++++++++++++++
>  1 files changed, 22 insertions(+), 0 deletions(-)

This needs the fix below to build on 32-bit.

Thanks,

	Ingo

Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/tools/kvm/virtio/net.c b/tools/kvm/virtio/net.c
index 5c39c43..6916af6 100644
--- a/tools/kvm/virtio/net.c
+++ b/tools/kvm/virtio/net.c
@@ -283,7 +283,7 @@ static bool virtio_net_pci_io_out(struct ioport *ioport, struct kvm *kvm, u16 po
 
 static void ioevent_callback(struct kvm *kvm, void *param)
 {
-	virtio_net_handle_callback(kvm, (u64)param);
+	virtio_net_handle_callback(kvm, (u64)(long)param);
 }
 
 static struct ioport_operations virtio_net_io_ops = {
@@ -416,7 +416,7 @@ void virtio_net__init(const struct virtio_net_parameters *params)
 				.io_len			= sizeof(u16),
 				.fn			= ioevent_callback,
 				.datamatch		= i,
-				.fn_ptr			= (void *)i,
+				.fn_ptr			= (void *)(long)i,
 				.fn_kvm			= params->kvm,
 				.fd			= eventfd(0, 0),
 			};