linux-kernel - Re: [PATCH] virtio/test: fix up after IOTLB changes

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Date:   Thu, 2 Apr 2020 12:01:56 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>, linux-kernel@...r.kernel.org
Cc:     Eugenio Pérez <eperezma@...hat.com>,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH] virtio/test: fix up after IOTLB changes


On 2020/4/2 上午12:51, Michael S. Tsirkin wrote:
> Allow building vringh without IOTLB (that's the case for userspace
> builds, will be useful for CAIF/VOD down the road too).
> Update for API tweaks.
> Don't include vringh with kernel builds.


I'm not quite sure we need this.

E.g the userspace accessor is not used by CAIF/VOP.


>
> Cc: Jason Wang <jasowang@...hat.com>
> Cc: Eugenio Pérez <eperezma@...hat.com>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>   drivers/vhost/test.c   | 4 ++--
>   drivers/vhost/vringh.c | 5 +++++
>   include/linux/vringh.h | 2 ++
>   tools/virtio/Makefile  | 3 ++-
>   4 files changed, 11 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/vhost/test.c b/drivers/vhost/test.c
> index 394e2e5c772d..9a3a09005e03 100644
> --- a/drivers/vhost/test.c
> +++ b/drivers/vhost/test.c
> @@ -120,7 +120,7 @@ static int vhost_test_open(struct inode *inode, struct file *f)
>   	vqs[VHOST_TEST_VQ] = &n->vqs[VHOST_TEST_VQ];
>   	n->vqs[VHOST_TEST_VQ].handle_kick = handle_vq_kick;
>   	vhost_dev_init(dev, vqs, VHOST_TEST_VQ_MAX, UIO_MAXIOV,
> -		       VHOST_TEST_PKT_WEIGHT, VHOST_TEST_WEIGHT);
> +		       VHOST_TEST_PKT_WEIGHT, VHOST_TEST_WEIGHT, NULL);
>   
>   	f->private_data = n;
>   
> @@ -225,7 +225,7 @@ static long vhost_test_reset_owner(struct vhost_test *n)
>   {
>   	void *priv = NULL;
>   	long err;
> -	struct vhost_umem *umem;
> +	struct vhost_iotlb *umem;
>   
>   	mutex_lock(&n->dev.mutex);
>   	err = vhost_dev_check_owner(&n->dev);
> diff --git a/drivers/vhost/vringh.c b/drivers/vhost/vringh.c
> index ee0491f579ac..878e565dfffe 100644
> --- a/drivers/vhost/vringh.c
> +++ b/drivers/vhost/vringh.c
> @@ -13,9 +13,11 @@
>   #include <linux/uaccess.h>
>   #include <linux/slab.h>
>   #include <linux/export.h>
> +#ifdef VHOST_IOTLB


Kbuild bot reports build issues with this.

It looks to me we should use #if IS_ENABLED(CONFIG_VHOST_IOTLB) here and 
following checks.

Thanks


>   #include <linux/bvec.h>
>   #include <linux/highmem.h>
>   #include <linux/vhost_iotlb.h>
> +#endif
>   #include <uapi/linux/virtio_config.h>
>   
>   static __printf(1,2) __cold void vringh_bad(const char *fmt, ...)
> @@ -1059,6 +1061,8 @@ int vringh_need_notify_kern(struct vringh *vrh)
>   }
>   EXPORT_SYMBOL(vringh_need_notify_kern);
>   
> +#ifdef VHOST_IOTLB
> +
>   static int iotlb_translate(const struct vringh *vrh,
>   			   u64 addr, u64 len, struct bio_vec iov[],
>   			   int iov_size, u32 perm)
> @@ -1416,5 +1420,6 @@ int vringh_need_notify_iotlb(struct vringh *vrh)
>   }
>   EXPORT_SYMBOL(vringh_need_notify_iotlb);
>   
> +#endif
>   
>   MODULE_LICENSE("GPL");
> diff --git a/include/linux/vringh.h b/include/linux/vringh.h
> index bd0503ca6f8f..ebff121c0b02 100644
> --- a/include/linux/vringh.h
> +++ b/include/linux/vringh.h
> @@ -14,8 +14,10 @@
>   #include <linux/virtio_byteorder.h>
>   #include <linux/uio.h>
>   #include <linux/slab.h>
> +#ifdef VHOST_IOTLB
>   #include <linux/dma-direction.h>
>   #include <linux/vhost_iotlb.h>
> +#endif
>   #include <asm/barrier.h>
>   
>   /* virtio_ring with information needed for host access. */
> diff --git a/tools/virtio/Makefile b/tools/virtio/Makefile
> index f33f32f1d208..d3f152f4660b 100644
> --- a/tools/virtio/Makefile
> +++ b/tools/virtio/Makefile
> @@ -22,7 +22,8 @@ OOT_CONFIGS=\
>   	CONFIG_VHOST=m \
>   	CONFIG_VHOST_NET=n \
>   	CONFIG_VHOST_SCSI=n \
> -	CONFIG_VHOST_VSOCK=n
> +	CONFIG_VHOST_VSOCK=n \
> +	CONFIG_VHOST_RING=n
>   OOT_BUILD=KCFLAGS="-I "${OOT_VHOST} ${MAKE} -C ${OOT_KSRC} V=${V}
>   oot-build:
>   	echo "UNSUPPORTED! Don't use the resulting modules in production!"