Re: [dpdk-dev] [PATCH 2/2] Patch to allow live migration of a VM with US-VHost.

["Gray, Mark D" <mark.d.gray@intel.com>]

> Subject: [dpdk-dev] [PATCH 2/2] Patch to allow live migration of a VM with
> US-VHost.
> 
> 
> Signed-off-by: Claire Murphy <claire.k.murphy@intel.com>
> ---
>  examples/vhost/vhost-net-cdev.c |   18 ++++++++++++++++++
>  examples/vhost/virtio-net.c     |    8 +++++++-
>  2 files changed, 25 insertions(+), 1 deletions(-)
> 
> diff --git a/examples/vhost/vhost-net-cdev.c b/examples/vhost/vhost-net-
> cdev.c index ef42e88..e942df0 100644
> --- a/examples/vhost/vhost-net-cdev.c
> +++ b/examples/vhost/vhost-net-cdev.c
> @@ -275,6 +275,24 @@ vhost_net_ioctl(fuse_req_t req, int cmd, void *arg,
>  			VHOST_IOCTL_R(struct vhost_vring_file, file, ops-
> >set_vring_call);
>  			break;
> 
> +		case VHOST_SET_VRING_ERR:
> +			RTE_LOG(ERR, CONFIG, "(%"PRIu64") IOCTL:
> VHOST_SET_VRING_ERR cmd=%d Un-Supported\n", ctx.fh,cmd);
> +			result = -1;
> +			fuse_reply_ioctl(req, result, NULL, 0);
> +			break;
> +
> +		case VHOST_SET_LOG_BASE:
> +			RTE_LOG(ERR, CONFIG, "(%"PRIu64") IOCTL:
> VHOST_SET_LOG_BASE cmd=%d Un-Supported\n", ctx.fh,cmd);
> +			result = 0;
> +			fuse_reply_ioctl(req, result, NULL, 0);
> +			break;
> +
> +		case VHOST_SET_LOG_FD:
> +			RTE_LOG(ERR, CONFIG, "(%"PRIu64") IOCTL:
> VHOST_SET_LOG_FD cmd=%d Un-Supported \n", ctx.fh,cmd);
> +			result = -1;
> +			fuse_reply_ioctl(req, result, NULL, 0);
> +			break;
> +
>  		default:
>  			RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") IOCTL:
> DOESN NOT EXIST\n", ctx.fh);
>  			result = -1;
> diff --git a/examples/vhost/virtio-net.c b/examples/vhost/virtio-net.c index
> 9be959f..3cf650d 100644
> --- a/examples/vhost/virtio-net.c
> +++ b/examples/vhost/virtio-net.c
> @@ -573,7 +573,13 @@ set_features(struct vhost_device_ctx ctx, uint64_t
> *pu)
>  	dev = get_device(ctx);
>  	if (dev == NULL)
>  		return -1;
> -	if (*pu & ~VHOST_FEATURES)
> +
> +	/*
> +	 * We mask the VHOST_F_LOG_ALL feature bit here as it is enabled
> by default
> +	 * during migration in QEMU even if we have it disabled as a feature
> in
> +	 * userspace vhost.
> +	 */
> +	if (*pu & ~(VHOST_FEATURES | (1ULL << VHOST_F_LOG_ALL)))
>  		return -1;
> 
>  	/* Store the negotiated feature list for the device. */
> --
> 1.7.0.7

+1. This patch enables live migration for us on Intel DPDK vSwitch.