[dpdk-dev] [PATCH] vhost: fix offset while mmaping log base address

[Tan, Jianfeng]

> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Tomasz Kulasek
> Sent: Friday, February 9, 2018 1:00 AM
> To: yliu at fridaylinux.org
> Cc: dev at dpdk.org; yuanhan.liu at linux.intel.com; stable at dpdk.org;
> Wodkowski, PawelX
> Subject: [dpdk-dev] [PATCH] vhost: fix offset while mmaping log base
> address
> 
> QEMU always set offset to 0 but for sanity we should take the offset
> into account.
> 
> Fixes: 54f9e32305d4 ("vhost: handle dirty pages logging request")
> Cc: yuanhan.liu at linux.intel.com
> Cc: stable at dpdk.org
> 
> Signed-off-by: Pawel Wodkowski <pawelx.wodkowski at intel.com>
> Signed-off-by: Tomasz Kulasek <tomaszx.kulasek at intel.com>

Reviewed-by: Jianfeng Tan <jianfeng.tan at intel.com>

Thanks!

> ---
>  lib/librte_vhost/vhost_user.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
> index 65ee33919..674f2ffe8 100644
> --- a/lib/librte_vhost/vhost_user.c
> +++ b/lib/librte_vhost/vhost_user.c
> @@ -991,7 +991,7 @@ vhost_user_set_log_base(struct virtio_net *dev,
> struct VhostUserMsg *msg)
>  	 * mmap from 0 to workaround a hugepage mmap bug: mmap will
>  	 * fail when offset is not page size aligned.
>  	 */
> -	addr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd,
> 0);
> +	addr = mmap(0, size + off, PROT_READ | PROT_WRITE,
> MAP_SHARED, fd, 0);
>  	close(fd);
>  	if (addr == MAP_FAILED) {
>  		RTE_LOG(ERR, VHOST_CONFIG, "mmap log base failed!\n");
> --
> 2.14.1