thr3ads.net - Linux Virtualization - [PATCH] virtio/test: fix up after IOTLB changes [Apr 2020]

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Michael S. Tsirkin

2020-Apr-01 16:51 UTC

[PATCH] virtio/test: fix up after IOTLB changes

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.

Cc: Jason Wang <jasowang at redhat.com>
Cc: Eugenio P?rez <eperezma at redhat.com>
Signed-off-by: Michael S. Tsirkin <mst at redhat.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
 #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!"
-- 
MST

Jason Wang

2020-Apr-02 04:01 UTC

head link

[PATCH] virtio/test: fix up after IOTLB changes

On 2020/4/2 ??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 at redhat.com>
> Cc: Eugenio P?rez <eperezma at redhat.com>
> Signed-off-by: Michael S. Tsirkin <mst at redhat.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!"

Michael S. Tsirkin

2020-Apr-02 12:53 UTC

head link

[PATCH] virtio/test: fix up after IOTLB changes

On Thu, Apr 02, 2020 at 12:01:56PM +0800, Jason Wang
wrote:> 
> On 2020/4/2 ??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.
Well any exported symbols are always compiled in, right?
So we can save some kernel memory by not building unused stuff ...

> > 
> > Cc: Jason Wang <jasowang at redhat.com>
> > Cc: Eugenio P?rez <eperezma at redhat.com>
> > Signed-off-by: Michael S. Tsirkin <mst at redhat.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
> 
In fact IS_REACHEABLE is probably the right thing to do.

> 
> >   #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!"

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