On 2020/4/2 下午8:53, Michael S. Tsirkin wrote:
On Thu, Apr 02, 2020 at 12:01:56PM +0800, Jason Wang wrote:
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.
Well any exported symbols are always compiled in, right?
So we can save some kernel memory by not building unused stuff ...
Yes, just want to mention that the there's no user for userspace
accessors now.
Cc: Jason Wang <jasowang@xxxxxxxxxx>
Cc: Eugenio Pérez <eperezma@xxxxxxxxxx>
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
---
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.
Yes.
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!"
