[v5,6/8] virtio/s390: add indirection to indicators access
diff mbox series

Message ID 20190612111236.99538-7-pasic@linux.ibm.com
State New
Headers show
Series
  • s390: virtio: support protected virtualization
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Commit Message

Halil Pasic June 12, 2019, 11:12 a.m. UTC
This will come in handy soon when we pull out the indicators from
virtio_ccw_device to a memory area that is shared with the hypervisor
(in particular for protected virtualization guests).

Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
---
 drivers/s390/virtio/virtio_ccw.c | 40 ++++++++++++++++++++------------
 1 file changed, 25 insertions(+), 15 deletions(-)

Comments

Michael Mueller June 13, 2019, 8:29 a.m. UTC | #1
On 12.06.19 13:12, Halil Pasic wrote:
> This will come in handy soon when we pull out the indicators from
> virtio_ccw_device to a memory area that is shared with the hypervisor
> (in particular for protected virtualization guests).
> 
> Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
> Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
> Reviewed-by: Cornelia Huck <cohuck@redhat.com>
> ---
>   drivers/s390/virtio/virtio_ccw.c | 40 ++++++++++++++++++++------------
>   1 file changed, 25 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c
> index 1da7430f94c8..e96a8cc56ec2 100644
> --- a/drivers/s390/virtio/virtio_ccw.c
> +++ b/drivers/s390/virtio/virtio_ccw.c
> @@ -68,6 +68,16 @@ struct virtio_ccw_device {
>   	void *airq_info;
>   };
>   
> +static inline unsigned long *indicators(struct virtio_ccw_device *vcdev)
> +{
> +	return &vcdev->indicators;
> +}
> +
> +static inline unsigned long *indicators2(struct virtio_ccw_device *vcdev)
> +{
> +	return &vcdev->indicators2;
> +}
> +
>   struct vq_info_block_legacy {
>   	__u64 queue;
>   	__u32 align;
> @@ -338,17 +348,17 @@ static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev,
>   		ccw->cda = (__u32)(unsigned long) thinint_area;
>   	} else {
>   		/* payload is the address of the indicators */
> -		indicatorp = kmalloc(sizeof(&vcdev->indicators),
> +		indicatorp = kmalloc(sizeof(indicators(vcdev)),
>   				     GFP_DMA | GFP_KERNEL);
>   		if (!indicatorp)
>   			return;
>   		*indicatorp = 0;
>   		ccw->cmd_code = CCW_CMD_SET_IND;
> -		ccw->count = sizeof(&vcdev->indicators);
> +		ccw->count = sizeof(indicators(vcdev));
>   		ccw->cda = (__u32)(unsigned long) indicatorp;
>   	}
>   	/* Deregister indicators from host. */
> -	vcdev->indicators = 0;
> +	*indicators(vcdev) = 0;
>   	ccw->flags = 0;
>   	ret = ccw_io_helper(vcdev, ccw,
>   			    vcdev->is_thinint ?
> @@ -657,10 +667,10 @@ static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
>   	 * We need a data area under 2G to communicate. Our payload is
>   	 * the address of the indicators.
>   	*/
> -	indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL);
> +	indicatorp = kmalloc(sizeof(indicators(vcdev)), GFP_DMA | GFP_KERNEL);
>   	if (!indicatorp)
>   		goto out;
> -	*indicatorp = (unsigned long) &vcdev->indicators;
> +	*indicatorp = (unsigned long) indicators(vcdev);
>   	if (vcdev->is_thinint) {
>   		ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw);
>   		if (ret)
> @@ -669,21 +679,21 @@ static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
>   	}
>   	if (!vcdev->is_thinint) {
>   		/* Register queue indicators with host. */
> -		vcdev->indicators = 0;
> +		*indicators(vcdev) = 0;
>   		ccw->cmd_code = CCW_CMD_SET_IND;
>   		ccw->flags = 0;
> -		ccw->count = sizeof(&vcdev->indicators);
> +		ccw->count = sizeof(indicators(vcdev));
>   		ccw->cda = (__u32)(unsigned long) indicatorp;
>   		ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND);
>   		if (ret)
>   			goto out;
>   	}
>   	/* Register indicators2 with host for config changes */
> -	*indicatorp = (unsigned long) &vcdev->indicators2;
> -	vcdev->indicators2 = 0;
> +	*indicatorp = (unsigned long) indicators2(vcdev);
> +	*indicators2(vcdev) = 0;
>   	ccw->cmd_code = CCW_CMD_SET_CONF_IND;
>   	ccw->flags = 0;
> -	ccw->count = sizeof(&vcdev->indicators2);
> +	ccw->count = sizeof(indicators2(vcdev));
>   	ccw->cda = (__u32)(unsigned long) indicatorp;
>   	ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND);
>   	if (ret)
> @@ -1093,17 +1103,17 @@ static void virtio_ccw_int_handler(struct ccw_device *cdev,
>   			vcdev->err = -EIO;
>   	}
>   	virtio_ccw_check_activity(vcdev, activity);
> -	for_each_set_bit(i, &vcdev->indicators,
> -			 sizeof(vcdev->indicators) * BITS_PER_BYTE) {
> +	for_each_set_bit(i, indicators(vcdev),
> +			 sizeof(*indicators(vcdev)) * BITS_PER_BYTE) {
>   		/* The bit clear must happen before the vring kick. */
> -		clear_bit(i, &vcdev->indicators);
> +		clear_bit(i, indicators(vcdev));
>   		barrier();
>   		vq = virtio_ccw_vq_by_ind(vcdev, i);
>   		vring_interrupt(0, vq);
>   	}
> -	if (test_bit(0, &vcdev->indicators2)) {
> +	if (test_bit(0, indicators2(vcdev))) {
>   		virtio_config_changed(&vcdev->vdev);
> -		clear_bit(0, &vcdev->indicators2);
> +		clear_bit(0, indicators2(vcdev));
>   	}
>   }
>   
> 

Reviewed-by: Michael Mueller <mimu@linux.ibm.com>

Michael

Patch
diff mbox series

diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c
index 1da7430f94c8..e96a8cc56ec2 100644
--- a/drivers/s390/virtio/virtio_ccw.c
+++ b/drivers/s390/virtio/virtio_ccw.c
@@ -68,6 +68,16 @@  struct virtio_ccw_device {
 	void *airq_info;
 };
 
+static inline unsigned long *indicators(struct virtio_ccw_device *vcdev)
+{
+	return &vcdev->indicators;
+}
+
+static inline unsigned long *indicators2(struct virtio_ccw_device *vcdev)
+{
+	return &vcdev->indicators2;
+}
+
 struct vq_info_block_legacy {
 	__u64 queue;
 	__u32 align;
@@ -338,17 +348,17 @@  static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev,
 		ccw->cda = (__u32)(unsigned long) thinint_area;
 	} else {
 		/* payload is the address of the indicators */
-		indicatorp = kmalloc(sizeof(&vcdev->indicators),
+		indicatorp = kmalloc(sizeof(indicators(vcdev)),
 				     GFP_DMA | GFP_KERNEL);
 		if (!indicatorp)
 			return;
 		*indicatorp = 0;
 		ccw->cmd_code = CCW_CMD_SET_IND;
-		ccw->count = sizeof(&vcdev->indicators);
+		ccw->count = sizeof(indicators(vcdev));
 		ccw->cda = (__u32)(unsigned long) indicatorp;
 	}
 	/* Deregister indicators from host. */
-	vcdev->indicators = 0;
+	*indicators(vcdev) = 0;
 	ccw->flags = 0;
 	ret = ccw_io_helper(vcdev, ccw,
 			    vcdev->is_thinint ?
@@ -657,10 +667,10 @@  static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
 	 * We need a data area under 2G to communicate. Our payload is
 	 * the address of the indicators.
 	*/
-	indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL);
+	indicatorp = kmalloc(sizeof(indicators(vcdev)), GFP_DMA | GFP_KERNEL);
 	if (!indicatorp)
 		goto out;
-	*indicatorp = (unsigned long) &vcdev->indicators;
+	*indicatorp = (unsigned long) indicators(vcdev);
 	if (vcdev->is_thinint) {
 		ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw);
 		if (ret)
@@ -669,21 +679,21 @@  static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
 	}
 	if (!vcdev->is_thinint) {
 		/* Register queue indicators with host. */
-		vcdev->indicators = 0;
+		*indicators(vcdev) = 0;
 		ccw->cmd_code = CCW_CMD_SET_IND;
 		ccw->flags = 0;
-		ccw->count = sizeof(&vcdev->indicators);
+		ccw->count = sizeof(indicators(vcdev));
 		ccw->cda = (__u32)(unsigned long) indicatorp;
 		ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND);
 		if (ret)
 			goto out;
 	}
 	/* Register indicators2 with host for config changes */
-	*indicatorp = (unsigned long) &vcdev->indicators2;
-	vcdev->indicators2 = 0;
+	*indicatorp = (unsigned long) indicators2(vcdev);
+	*indicators2(vcdev) = 0;
 	ccw->cmd_code = CCW_CMD_SET_CONF_IND;
 	ccw->flags = 0;
-	ccw->count = sizeof(&vcdev->indicators2);
+	ccw->count = sizeof(indicators2(vcdev));
 	ccw->cda = (__u32)(unsigned long) indicatorp;
 	ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND);
 	if (ret)
@@ -1093,17 +1103,17 @@  static void virtio_ccw_int_handler(struct ccw_device *cdev,
 			vcdev->err = -EIO;
 	}
 	virtio_ccw_check_activity(vcdev, activity);
-	for_each_set_bit(i, &vcdev->indicators,
-			 sizeof(vcdev->indicators) * BITS_PER_BYTE) {
+	for_each_set_bit(i, indicators(vcdev),
+			 sizeof(*indicators(vcdev)) * BITS_PER_BYTE) {
 		/* The bit clear must happen before the vring kick. */
-		clear_bit(i, &vcdev->indicators);
+		clear_bit(i, indicators(vcdev));
 		barrier();
 		vq = virtio_ccw_vq_by_ind(vcdev, i);
 		vring_interrupt(0, vq);
 	}
-	if (test_bit(0, &vcdev->indicators2)) {
+	if (test_bit(0, indicators2(vcdev))) {
 		virtio_config_changed(&vcdev->vdev);
-		clear_bit(0, &vcdev->indicators2);
+		clear_bit(0, indicators2(vcdev));
 	}
 }