netdev - Re: [PATCH 1/2] vhost: remove the possible fruitless search on iotlb prefetch

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Message-ID: <3e8361c3-8a1b-6f30-80a1-1d45dabfdc39@redhat.com>
Date:   Mon, 21 Aug 2017 11:09:00 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Koichiro Den <den@...ipeden.com>, mst@...hat.com
Cc:     kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] vhost: remove the possible fruitless search on iotlb
 prefetch



On 2017年08月19日 14:41, Koichiro Den wrote:
> Signed-off-by: Koichiro Den <den@...ipeden.com>
> ---
>   drivers/vhost/vhost.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
> index e4613a3c362d..93e909afc1c3 100644
> --- a/drivers/vhost/vhost.c
> +++ b/drivers/vhost/vhost.c
> @@ -1184,7 +1184,7 @@ static int iotlb_access_ok(struct vhost_virtqueue *vq,
>   	while (len > s) {
>   		node = vhost_umem_interval_tree_iter_first(&umem->umem_tree,
>   							   addr,
> -							   addr + len - 1);
> +							   addr + len - s - 1);
>   		if (node == NULL || node->start > addr) {
>   			vhost_iotlb_miss(vq, addr, access);
>   			return false;

Acked-by: Jason Wang <jasowang@...hat.com>