[PATCH v2 0/8] tools/vhost: Reset virtqueue on tests

[PATCH v2 0/8] tools/vhost: Reset virtqueue on tests

[Eugenio Pérez]

This series add tests used to validate the "vhost: Reset batched
descriptors on SET_VRING_BASE call" series, with a few minor updates of
them.

They are based on the tests sent back them, the ones that were not
included (reasons in that thread). This series changes:

* Delete need to export the ugly function in virtio_ring, now all the
code is added in tools/virtio (except the one line fix).
* Add forgotten uses of vhost_vq_set_backend. Fix bad usage order in
vhost_test_set_backend.
* Drop random reset, not really needed.
* Minor changes.

This patchset commit messages contains references to commits under
"for_linus" tag and references to commits in for_linus..mst/vhost.
They are fixes, so probably it is better just to squash if possible:

("7c48601a3d4d tools/virtio: Add --reset=random"): Already in for_linus
("af3756cfed9a vhost: batching fetches"): Only in vhost branch, not in
for_linus.

Thanks!

Changes from v1:
* Different base, since branch was force-pushed.
* Using new vring_legacy_*, as base uses them now.

This serie is meant to be applied on top of
503b1b3efb47e267001beba8e0759c15fa3e9be7 in
git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git.

Eugenio Pérez (8):
  tools/virtio: fix virtio_test.c indentation
  vhost: Not cleaning batched descs in VHOST_SET_VRING_BASE ioctl
  vhost: Replace vq->private_data access by backend accesors
  vhost: Fix bad order in vhost_test_set_backend at enable
  tools/virtio: Use __vring_new_virtqueue in virtio_test.c
  tools/virtio: Extract virtqueue initialization in vq_reset
  tools/virtio: Reset index in virtio_test --reset.
  tools/virtio: Use tools/include/list.h instead of stubs

 drivers/vhost/test.c        |  8 ++---
 drivers/vhost/vhost.c       |  1 -
 tools/virtio/linux/kernel.h |  7 +----
 tools/virtio/linux/virtio.h |  5 ++--
 tools/virtio/virtio_test.c  | 58 +++++++++++++++++++++++++++----------
 tools/virtio/vringh_test.c  |  2 ++
 6 files changed, 51 insertions(+), 30 deletions(-)

-- 
2.18.1

[PATCH v2 1/8] tools/virtio: fix virtio_test.c indentation

[Eugenio Pérez]

Just removing extra whitespace.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 tools/virtio/virtio_test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
index 25be607d8711..1d5144590df6 100644
--- a/tools/virtio/virtio_test.c
+++ b/tools/virtio/virtio_test.c
@@ -222,7 +222,7 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
 					  &backend);
 				assert(!r);
 
-                                while (completed > next_reset)
+				while (completed > next_reset)
 					next_reset += completed;
 			}
 		} while (r == 0);
-- 
2.18.1

[PATCH v2 2/8] vhost: Not cleaning batched descs in VHOST_SET_VRING_BASE ioctl

[Eugenio Pérez]

They are cleaned in vhost_vq_set_backend, which can be called with an
active backend. To set and remove backends already clean batched
descriptors, so to do it here is completely redundant.

Fixes: ("af3756cfed9a vhost: batching fetches")

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 drivers/vhost/vhost.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 0395229486a9..882d0df57e24 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -1579,7 +1579,6 @@ long vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *arg
 		vq->last_avail_idx = s.num;
 		/* Forget the cached index value. */
 		vq->avail_idx = vq->last_avail_idx;
-		vq->ndescs = vq->first_desc = 0;
 		break;
 	case VHOST_GET_VRING_BASE:
 		s.index = idx;
-- 
2.18.1

[PATCH v2 3/8] vhost: Replace vq->private_data access by backend accesors

[Eugenio Pérez]

This function still places backend directly in private_data, instead of
use the accesors created on ("cbfc8f21b49a vhost: Create accessors for
virtqueues private_data"). Using accesor.

Fixes: ("7ce8cc28ce48 tools/virtio: Add --reset=random")

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 drivers/vhost/test.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/vhost/test.c b/drivers/vhost/test.c
index 251ca723ac3f..789c096e454b 100644
--- a/drivers/vhost/test.c
+++ b/drivers/vhost/test.c
@@ -265,7 +265,7 @@ static int vhost_test_set_features(struct vhost_test *n, u64 features)
 
 static long vhost_test_set_backend(struct vhost_test *n, unsigned index, int fd)
 {
-	static void *private_data;
+	static void *backend;
 
 	const bool enable = fd != -1;
 	struct vhost_virtqueue *vq;
@@ -290,11 +290,11 @@ static long vhost_test_set_backend(struct vhost_test *n, unsigned index, int fd)
 	}
 	if (!enable) {
 		vhost_poll_stop(&vq->poll);
-		private_data = vq->private_data;
-		vq->private_data = NULL;
+		backend = vhost_vq_get_backend(vq);
+		vhost_vq_set_backend(vq, NULL);
 	} else {
 		r = vhost_vq_init_access(vq);
-		vq->private_data = private_data;
+		vhost_vq_set_backend(vq, backend);
 		if (r == 0)
 			r = vhost_poll_start(&vq->poll, vq->kick);
 	}
-- 
2.18.1

[PATCH v2 4/8] vhost: Fix bad order in vhost_test_set_backend at enable

[Eugenio Pérez]

The reset was not done properly: A init call was given with no active
backend. This solves that.

Fixes: ("7c48601a3d4d tools/virtio: Add --reset=random")

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 drivers/vhost/test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vhost/test.c b/drivers/vhost/test.c
index 789c096e454b..6aed0cab8b17 100644
--- a/drivers/vhost/test.c
+++ b/drivers/vhost/test.c
@@ -293,8 +293,8 @@ static long vhost_test_set_backend(struct vhost_test *n, unsigned index, int fd)
 		backend = vhost_vq_get_backend(vq);
 		vhost_vq_set_backend(vq, NULL);
 	} else {
-		r = vhost_vq_init_access(vq);
 		vhost_vq_set_backend(vq, backend);
+		r = vhost_vq_init_access(vq);
 		if (r == 0)
 			r = vhost_poll_start(&vq->poll, vq->kick);
 	}
-- 
2.18.1

[PATCH v2 5/8] tools/virtio: Use __vring_new_virtqueue in virtio_test.c

[Eugenio Pérez]

As updated in ("2a2d1382fe9d virtio: Add improved queue allocation API")

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 tools/virtio/virtio_test.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
index 1d5144590df6..d9827b640c21 100644
--- a/tools/virtio/virtio_test.c
+++ b/tools/virtio/virtio_test.c
@@ -106,10 +106,9 @@ static void vq_info_add(struct vdev_info *dev, int num)
 	assert(r >= 0);
 	memset(info->ring, 0, vring_legacy_size(num, 4096));
 	vring_legacy_init(&info->vring, num, info->ring, 4096);
-	info->vq = vring_new_virtqueue(info->idx,
-				       info->vring.num, 4096, &dev->vdev,
-				       true, false, info->ring,
-				       vq_notify, vq_callback, "test");
+	info->vq =
+		__vring_new_virtqueue(info->idx, info->vring, &dev->vdev, true,
+				      false, vq_notify, vq_callback, "test");
 	assert(info->vq);
 	info->vq->priv = info;
 	vhost_vq_setup(dev, info);
-- 
2.18.1

[PATCH v2 6/8] tools/virtio: Extract virtqueue initialization in vq_reset

[Eugenio Pérez]

So we can reset after that in the main loop.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 tools/virtio/virtio_test.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
index d9827b640c21..18d5347003eb 100644
--- a/tools/virtio/virtio_test.c
+++ b/tools/virtio/virtio_test.c
@@ -95,6 +95,19 @@ void vhost_vq_setup(struct vdev_info *dev, struct vq_info *info)
 	assert(r >= 0);
 }
 
+static void vq_reset(struct vq_info *info, int num, struct virtio_device *vdev)
+{
+	if (info->vq)
+		vring_del_virtqueue(info->vq);
+
+	memset(info->ring, 0, vring_legacy_size(num, 4096));
+	vring_legacy_init(&info->vring, num, info->ring, 4096);
+	info->vq = __vring_new_virtqueue(info->idx, info->vring, vdev, true,
+					 false, vq_notify, vq_callback, "test");
+	assert(info->vq);
+	info->vq->priv = info;
+}
+
 static void vq_info_add(struct vdev_info *dev, int num)
 {
 	struct vq_info *info = &dev->vqs[dev->nvqs];
@@ -104,13 +117,7 @@ static void vq_info_add(struct vdev_info *dev, int num)
 	info->call = eventfd(0, EFD_NONBLOCK);
 	r = posix_memalign(&info->ring, 4096, vring_legacy_size(num, 4096));
 	assert(r >= 0);
-	memset(info->ring, 0, vring_legacy_size(num, 4096));
-	vring_legacy_init(&info->vring, num, info->ring, 4096);
-	info->vq =
-		__vring_new_virtqueue(info->idx, info->vring, &dev->vdev, true,
-				      false, vq_notify, vq_callback, "test");
-	assert(info->vq);
-	info->vq->priv = info;
+	vq_reset(info, num, &dev->vdev);
 	vhost_vq_setup(dev, info);
 	dev->fds[info->idx].fd = info->call;
 	dev->fds[info->idx].events = POLLIN;
-- 
2.18.1

[PATCH v2 7/8] tools/virtio: Reset index in virtio_test --reset.

[Eugenio Pérez]

This way behavior for vhost is more like a VM.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 tools/virtio/virtio_test.c | 33 ++++++++++++++++++++++++++-------
 1 file changed, 26 insertions(+), 7 deletions(-)

diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
index 18d5347003eb..dca64d36a882 100644
--- a/tools/virtio/virtio_test.c
+++ b/tools/virtio/virtio_test.c
@@ -20,7 +20,6 @@
 #include "../../drivers/vhost/test.h"
 
 #define RANDOM_BATCH -1
-#define RANDOM_RESET -1
 
 /* Unused */
 void *__kmalloc_fake, *__kfree_ignore_start, *__kfree_ignore_end;
@@ -49,6 +48,7 @@ struct vdev_info {
 
 static const struct vhost_vring_file no_backend = { .fd = -1 },
 				     backend = { .fd = 1 };
+static const struct vhost_vring_state null_state = {};
 
 bool vq_notify(struct virtqueue *vq)
 {
@@ -174,14 +174,19 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
 	unsigned len;
 	long long spurious = 0;
 	const bool random_batch = batch == RANDOM_BATCH;
+
 	r = ioctl(dev->control, VHOST_TEST_RUN, &test);
 	assert(r >= 0);
+	if (!reset_n) {
+		next_reset = INT_MAX;
+	}
+
 	for (;;) {
 		virtqueue_disable_cb(vq->vq);
 		completed_before = completed;
 		started_before = started;
 		do {
-			const bool reset = reset_n && completed > next_reset;
+			const bool reset = completed > next_reset;
 			if (random_batch)
 				batch = (random() % vq->vring.num) + 1;
 
@@ -224,10 +229,24 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
 			}
 
 			if (reset) {
+				struct vhost_vring_state s = { .index = 0 };
+
+				vq_reset(vq, vq->vring.num, &dev->vdev);
+
+				r = ioctl(dev->control, VHOST_GET_VRING_BASE,
+					  &s);
+				assert(!r);
+
+				s.num = 0;
+				r = ioctl(dev->control, VHOST_SET_VRING_BASE,
+					  &null_state);
+				assert(!r);
+
 				r = ioctl(dev->control, VHOST_TEST_SET_BACKEND,
 					  &backend);
 				assert(!r);
 
+				started = completed;
 				while (completed > next_reset)
 					next_reset += completed;
 			}
@@ -249,7 +268,9 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
 	test = 0;
 	r = ioctl(dev->control, VHOST_TEST_RUN, &test);
 	assert(r >= 0);
-	fprintf(stderr, "spurious wakeups: 0x%llx\n", spurious);
+	fprintf(stderr,
+		"spurious wakeups: 0x%llx started=0x%lx completed=0x%lx\n",
+		spurious, started, completed);
 }
 
 const char optstring[] = "h";
@@ -312,7 +333,7 @@ static void help(void)
 		" [--no-virtio-1]"
 		" [--delayed-interrupt]"
 		" [--batch=random/N]"
-		" [--reset=random/N]"
+		" [--reset=N]"
 		"\n");
 }
 
@@ -360,11 +381,9 @@ int main(int argc, char **argv)
 		case 'r':
 			if (!optarg) {
 				reset = 1;
-			} else if (0 == strcmp(optarg, "random")) {
-				reset = RANDOM_RESET;
 			} else {
 				reset = strtol(optarg, NULL, 10);
-				assert(reset >= 0);
+				assert(reset > 0);
 				assert(reset < (long)INT_MAX + 1);
 			}
 			break;
-- 
2.18.1

[PATCH v2 8/8] tools/virtio: Use tools/include/list.h instead of stubs

[Eugenio Pérez]

It should not make any significant difference but reduce stub code.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 tools/virtio/linux/kernel.h | 7 +------
 tools/virtio/linux/virtio.h | 5 ++---
 tools/virtio/virtio_test.c  | 1 +
 tools/virtio/vringh_test.c  | 2 ++
 4 files changed, 6 insertions(+), 9 deletions(-)

diff --git a/tools/virtio/linux/kernel.h b/tools/virtio/linux/kernel.h
index 6683b4a70b05..caab980211a6 100644
--- a/tools/virtio/linux/kernel.h
+++ b/tools/virtio/linux/kernel.h
@@ -11,6 +11,7 @@
 
 #include <linux/compiler.h>
 #include <linux/types.h>
+#include <linux/list.h>
 #include <linux/printk.h>
 #include <linux/bug.h>
 #include <errno.h>
@@ -135,10 +136,4 @@ static inline void free_page(unsigned long addr)
 	(void) (&_min1 == &_min2);		\
 	_min1 < _min2 ? _min1 : _min2; })
 
-/* TODO: empty stubs for now. Broken but enough for virtio_ring.c */
-#define list_add_tail(a, b) do {} while (0)
-#define list_del(a) do {} while (0)
-#define list_for_each_entry(a, b, c) while (0)
-/* end of stubs */
-
 #endif /* KERNEL_H */
diff --git a/tools/virtio/linux/virtio.h b/tools/virtio/linux/virtio.h
index b751350d4ce8..5d90254ddae4 100644
--- a/tools/virtio/linux/virtio.h
+++ b/tools/virtio/linux/virtio.h
@@ -11,12 +11,11 @@ struct device {
 struct virtio_device {
 	struct device dev;
 	u64 features;
+	struct list_head vqs;
 };
 
 struct virtqueue {
-	/* TODO: commented as list macros are empty stubs for now.
-	 * Broken but enough for virtio_ring.c
-	 * struct list_head list; */
+	struct list_head list;
 	void (*callback)(struct virtqueue *vq);
 	const char *name;
 	struct virtio_device *vdev;
diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
index dca64d36a882..c0b924b41a1d 100644
--- a/tools/virtio/virtio_test.c
+++ b/tools/virtio/virtio_test.c
@@ -129,6 +129,7 @@ static void vdev_info_init(struct vdev_info* dev, unsigned long long features)
 	int r;
 	memset(dev, 0, sizeof *dev);
 	dev->vdev.features = features;
+	INIT_LIST_HEAD(&dev->vdev.vqs);
 	dev->buf_size = 1024;
 	dev->buf = malloc(dev->buf_size);
 	assert(dev->buf);
diff --git a/tools/virtio/vringh_test.c b/tools/virtio/vringh_test.c
index 8ee2c9a6ad46..b88b0337fcfd 100644
--- a/tools/virtio/vringh_test.c
+++ b/tools/virtio/vringh_test.c
@@ -307,6 +307,7 @@ static int parallel_test(u64 features,
 		close(to_host[0]);
 
 		gvdev.vdev.features = features;
+		INIT_LIST_HEAD(&gvdev.vdev.vqs);
 		gvdev.to_host_fd = to_host[1];
 		gvdev.notifies = 0;
 
@@ -453,6 +454,7 @@ int main(int argc, char *argv[])
 
 	getrange = getrange_iov;
 	vdev.features = 0;
+	INIT_LIST_HEAD(&vdev.vqs);
 
 	while (argv[1]) {
 		if (strcmp(argv[1], "--indirect") == 0)
-- 
2.18.1

Re: [PATCH v2 5/8] tools/virtio: Use __vring_new_virtqueue in virtio_test.c

[Michael S. Tsirkin]

On Thu, Apr 16, 2020 at 09:56:40AM +0200, Eugenio Pérez wrote:
> As updated in ("2a2d1382fe9d virtio: Add improved queue allocation API")
> 
> Signed-off-by: Eugenio Pérez <eperezma@redhat.com>

Pls add motivation for these changes.

> ---
>  tools/virtio/virtio_test.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
> index 1d5144590df6..d9827b640c21 100644
> --- a/tools/virtio/virtio_test.c
> +++ b/tools/virtio/virtio_test.c
> @@ -106,10 +106,9 @@ static void vq_info_add(struct vdev_info *dev, int num)
>  	assert(r >= 0);
>  	memset(info->ring, 0, vring_legacy_size(num, 4096));
>  	vring_legacy_init(&info->vring, num, info->ring, 4096);
> -	info->vq = vring_new_virtqueue(info->idx,
> -				       info->vring.num, 4096, &dev->vdev,
> -				       true, false, info->ring,
> -				       vq_notify, vq_callback, "test");
> +	info->vq =
> +		__vring_new_virtqueue(info->idx, info->vring, &dev->vdev, true,
> +				      false, vq_notify, vq_callback, "test");
>  	assert(info->vq);
>  	info->vq->priv = info;
>  	vhost_vq_setup(dev, info);
> -- 
> 2.18.1

Re: [PATCH v2 7/8] tools/virtio: Reset index in virtio_test --reset.

[Michael S. Tsirkin]

On Thu, Apr 16, 2020 at 09:56:42AM +0200, Eugenio Pérez wrote:
> This way behavior for vhost is more like a VM.
> 
> Signed-off-by: Eugenio Pérez <eperezma@redhat.com>

I dropped --reset from 5.7 since Linus felt it's unappropriate.
I guess I should squash this in with --reset?

> ---
>  tools/virtio/virtio_test.c | 33 ++++++++++++++++++++++++++-------
>  1 file changed, 26 insertions(+), 7 deletions(-)
> 
> diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
> index 18d5347003eb..dca64d36a882 100644
> --- a/tools/virtio/virtio_test.c
> +++ b/tools/virtio/virtio_test.c
> @@ -20,7 +20,6 @@
>  #include "../../drivers/vhost/test.h"
>  
>  #define RANDOM_BATCH -1
> -#define RANDOM_RESET -1
>  
>  /* Unused */
>  void *__kmalloc_fake, *__kfree_ignore_start, *__kfree_ignore_end;
> @@ -49,6 +48,7 @@ struct vdev_info {
>  
>  static const struct vhost_vring_file no_backend = { .fd = -1 },
>  				     backend = { .fd = 1 };
> +static const struct vhost_vring_state null_state = {};
>  
>  bool vq_notify(struct virtqueue *vq)
>  {
> @@ -174,14 +174,19 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
>  	unsigned len;
>  	long long spurious = 0;
>  	const bool random_batch = batch == RANDOM_BATCH;
> +
>  	r = ioctl(dev->control, VHOST_TEST_RUN, &test);
>  	assert(r >= 0);
> +	if (!reset_n) {
> +		next_reset = INT_MAX;
> +	}
> +
>  	for (;;) {
>  		virtqueue_disable_cb(vq->vq);
>  		completed_before = completed;
>  		started_before = started;
>  		do {
> -			const bool reset = reset_n && completed > next_reset;
> +			const bool reset = completed > next_reset;
>  			if (random_batch)
>  				batch = (random() % vq->vring.num) + 1;
>  
> @@ -224,10 +229,24 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
>  			}
>  
>  			if (reset) {
> +				struct vhost_vring_state s = { .index = 0 };
> +
> +				vq_reset(vq, vq->vring.num, &dev->vdev);
> +
> +				r = ioctl(dev->control, VHOST_GET_VRING_BASE,
> +					  &s);
> +				assert(!r);
> +
> +				s.num = 0;
> +				r = ioctl(dev->control, VHOST_SET_VRING_BASE,
> +					  &null_state);
> +				assert(!r);
> +
>  				r = ioctl(dev->control, VHOST_TEST_SET_BACKEND,
>  					  &backend);
>  				assert(!r);
>  
> +				started = completed;
>  				while (completed > next_reset)
>  					next_reset += completed;
>  			}
> @@ -249,7 +268,9 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
>  	test = 0;
>  	r = ioctl(dev->control, VHOST_TEST_RUN, &test);
>  	assert(r >= 0);
> -	fprintf(stderr, "spurious wakeups: 0x%llx\n", spurious);
> +	fprintf(stderr,
> +		"spurious wakeups: 0x%llx started=0x%lx completed=0x%lx\n",
> +		spurious, started, completed);
>  }
>  
>  const char optstring[] = "h";
> @@ -312,7 +333,7 @@ static void help(void)
>  		" [--no-virtio-1]"
>  		" [--delayed-interrupt]"
>  		" [--batch=random/N]"
> -		" [--reset=random/N]"
> +		" [--reset=N]"
>  		"\n");
>  }
>  
> @@ -360,11 +381,9 @@ int main(int argc, char **argv)
>  		case 'r':
>  			if (!optarg) {
>  				reset = 1;
> -			} else if (0 == strcmp(optarg, "random")) {
> -				reset = RANDOM_RESET;
>  			} else {
>  				reset = strtol(optarg, NULL, 10);
> -				assert(reset >= 0);
> +				assert(reset > 0);
>  				assert(reset < (long)INT_MAX + 1);
>  			}
>  			break;
> -- 
> 2.18.1

Re: [PATCH v2 7/8] tools/virtio: Reset index in virtio_test --reset.

[Eugenio Perez Martin]

On Fri, Apr 17, 2020 at 12:34 AM Michael S. Tsirkin <mst@redhat.com> wrote:
>
> On Thu, Apr 16, 2020 at 09:56:42AM +0200, Eugenio Pérez wrote:
> > This way behavior for vhost is more like a VM.
> >
> > Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
>
> I dropped --reset from 5.7 since Linus felt it's unappropriate.
> I guess I should squash this in with --reset?
>

Yes please.

If you prefer I can do it using the base you want, so all commits
messages are right.

Thanks!

> > ---
> >  tools/virtio/virtio_test.c | 33 ++++++++++++++++++++++++++-------
> >  1 file changed, 26 insertions(+), 7 deletions(-)
> >
> > diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
> > index 18d5347003eb..dca64d36a882 100644
> > --- a/tools/virtio/virtio_test.c
> > +++ b/tools/virtio/virtio_test.c
> > @@ -20,7 +20,6 @@
> >  #include "../../drivers/vhost/test.h"
> >
> >  #define RANDOM_BATCH -1
> > -#define RANDOM_RESET -1
> >
> >  /* Unused */
> >  void *__kmalloc_fake, *__kfree_ignore_start, *__kfree_ignore_end;
> > @@ -49,6 +48,7 @@ struct vdev_info {
> >
> >  static const struct vhost_vring_file no_backend = { .fd = -1 },
> >                                    backend = { .fd = 1 };
> > +static const struct vhost_vring_state null_state = {};
> >
> >  bool vq_notify(struct virtqueue *vq)
> >  {
> > @@ -174,14 +174,19 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
> >       unsigned len;
> >       long long spurious = 0;
> >       const bool random_batch = batch == RANDOM_BATCH;
> > +
> >       r = ioctl(dev->control, VHOST_TEST_RUN, &test);
> >       assert(r >= 0);
> > +     if (!reset_n) {
> > +             next_reset = INT_MAX;
> > +     }
> > +
> >       for (;;) {
> >               virtqueue_disable_cb(vq->vq);
> >               completed_before = completed;
> >               started_before = started;
> >               do {
> > -                     const bool reset = reset_n && completed > next_reset;
> > +                     const bool reset = completed > next_reset;
> >                       if (random_batch)
> >                               batch = (random() % vq->vring.num) + 1;
> >
> > @@ -224,10 +229,24 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
> >                       }
> >
> >                       if (reset) {
> > +                             struct vhost_vring_state s = { .index = 0 };
> > +
> > +                             vq_reset(vq, vq->vring.num, &dev->vdev);
> > +
> > +                             r = ioctl(dev->control, VHOST_GET_VRING_BASE,
> > +                                       &s);
> > +                             assert(!r);
> > +
> > +                             s.num = 0;
> > +                             r = ioctl(dev->control, VHOST_SET_VRING_BASE,
> > +                                       &null_state);
> > +                             assert(!r);
> > +
> >                               r = ioctl(dev->control, VHOST_TEST_SET_BACKEND,
> >                                         &backend);
> >                               assert(!r);
> >
> > +                             started = completed;
> >                               while (completed > next_reset)
> >                                       next_reset += completed;
> >                       }
> > @@ -249,7 +268,9 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
> >       test = 0;
> >       r = ioctl(dev->control, VHOST_TEST_RUN, &test);
> >       assert(r >= 0);
> > -     fprintf(stderr, "spurious wakeups: 0x%llx\n", spurious);
> > +     fprintf(stderr,
> > +             "spurious wakeups: 0x%llx started=0x%lx completed=0x%lx\n",
> > +             spurious, started, completed);
> >  }
> >
> >  const char optstring[] = "h";
> > @@ -312,7 +333,7 @@ static void help(void)
> >               " [--no-virtio-1]"
> >               " [--delayed-interrupt]"
> >               " [--batch=random/N]"
> > -             " [--reset=random/N]"
> > +             " [--reset=N]"
> >               "\n");
> >  }
> >
> > @@ -360,11 +381,9 @@ int main(int argc, char **argv)
> >               case 'r':
> >                       if (!optarg) {
> >                               reset = 1;
> > -                     } else if (0 == strcmp(optarg, "random")) {
> > -                             reset = RANDOM_RESET;
> >                       } else {
> >                               reset = strtol(optarg, NULL, 10);
> > -                             assert(reset >= 0);
> > +                             assert(reset > 0);
> >                               assert(reset < (long)INT_MAX + 1);
> >                       }
> >                       break;
> > --
> > 2.18.1
>

Re: [PATCH v2 7/8] tools/virtio: Reset index in virtio_test --reset.

[Michael S. Tsirkin]

On Fri, Apr 17, 2020 at 09:04:04AM +0200, Eugenio Perez Martin wrote:
> On Fri, Apr 17, 2020 at 12:34 AM Michael S. Tsirkin <mst@redhat.com> wrote:
> >
> > On Thu, Apr 16, 2020 at 09:56:42AM +0200, Eugenio Pérez wrote:
> > > This way behavior for vhost is more like a VM.
> > >
> > > Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
> >
> > I dropped --reset from 5.7 since Linus felt it's unappropriate.
> > I guess I should squash this in with --reset?
> >
> 
> Yes please.
> 
> If you prefer I can do it using the base you want, so all commits
> messages are right.
> 
> Thanks!

OK so I dropped new tests from vhost for now, pls rebased on
top of that.

Thanks!

> > > ---
> > >  tools/virtio/virtio_test.c | 33 ++++++++++++++++++++++++++-------
> > >  1 file changed, 26 insertions(+), 7 deletions(-)
> > >
> > > diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
> > > index 18d5347003eb..dca64d36a882 100644
> > > --- a/tools/virtio/virtio_test.c
> > > +++ b/tools/virtio/virtio_test.c
> > > @@ -20,7 +20,6 @@
> > >  #include "../../drivers/vhost/test.h"
> > >
> > >  #define RANDOM_BATCH -1
> > > -#define RANDOM_RESET -1
> > >
> > >  /* Unused */
> > >  void *__kmalloc_fake, *__kfree_ignore_start, *__kfree_ignore_end;
> > > @@ -49,6 +48,7 @@ struct vdev_info {
> > >
> > >  static const struct vhost_vring_file no_backend = { .fd = -1 },
> > >                                    backend = { .fd = 1 };
> > > +static const struct vhost_vring_state null_state = {};
> > >
> > >  bool vq_notify(struct virtqueue *vq)
> > >  {
> > > @@ -174,14 +174,19 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
> > >       unsigned len;
> > >       long long spurious = 0;
> > >       const bool random_batch = batch == RANDOM_BATCH;
> > > +
> > >       r = ioctl(dev->control, VHOST_TEST_RUN, &test);
> > >       assert(r >= 0);
> > > +     if (!reset_n) {
> > > +             next_reset = INT_MAX;
> > > +     }
> > > +
> > >       for (;;) {
> > >               virtqueue_disable_cb(vq->vq);
> > >               completed_before = completed;
> > >               started_before = started;
> > >               do {
> > > -                     const bool reset = reset_n && completed > next_reset;
> > > +                     const bool reset = completed > next_reset;
> > >                       if (random_batch)
> > >                               batch = (random() % vq->vring.num) + 1;
> > >
> > > @@ -224,10 +229,24 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
> > >                       }
> > >
> > >                       if (reset) {
> > > +                             struct vhost_vring_state s = { .index = 0 };
> > > +
> > > +                             vq_reset(vq, vq->vring.num, &dev->vdev);
> > > +
> > > +                             r = ioctl(dev->control, VHOST_GET_VRING_BASE,
> > > +                                       &s);
> > > +                             assert(!r);
> > > +
> > > +                             s.num = 0;
> > > +                             r = ioctl(dev->control, VHOST_SET_VRING_BASE,
> > > +                                       &null_state);
> > > +                             assert(!r);
> > > +
> > >                               r = ioctl(dev->control, VHOST_TEST_SET_BACKEND,
> > >                                         &backend);
> > >                               assert(!r);
> > >
> > > +                             started = completed;
> > >                               while (completed > next_reset)
> > >                                       next_reset += completed;
> > >                       }
> > > @@ -249,7 +268,9 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
> > >       test = 0;
> > >       r = ioctl(dev->control, VHOST_TEST_RUN, &test);
> > >       assert(r >= 0);
> > > -     fprintf(stderr, "spurious wakeups: 0x%llx\n", spurious);
> > > +     fprintf(stderr,
> > > +             "spurious wakeups: 0x%llx started=0x%lx completed=0x%lx\n",
> > > +             spurious, started, completed);
> > >  }
> > >
> > >  const char optstring[] = "h";
> > > @@ -312,7 +333,7 @@ static void help(void)
> > >               " [--no-virtio-1]"
> > >               " [--delayed-interrupt]"
> > >               " [--batch=random/N]"
> > > -             " [--reset=random/N]"
> > > +             " [--reset=N]"
> > >               "\n");
> > >  }
> > >
> > > @@ -360,11 +381,9 @@ int main(int argc, char **argv)
> > >               case 'r':
> > >                       if (!optarg) {
> > >                               reset = 1;
> > > -                     } else if (0 == strcmp(optarg, "random")) {
> > > -                             reset = RANDOM_RESET;
> > >                       } else {
> > >                               reset = strtol(optarg, NULL, 10);
> > > -                             assert(reset >= 0);
> > > +                             assert(reset > 0);
> > >                               assert(reset < (long)INT_MAX + 1);
> > >                       }
> > >                       break;
> > > --
> > > 2.18.1
> >

Re: [PATCH v2 5/8] tools/virtio: Use __vring_new_virtqueue in virtio_test.c

[Eugenio Perez Martin]

On Fri, Apr 17, 2020 at 12:33 AM Michael S. Tsirkin <mst@redhat.com> wrote:
>
> On Thu, Apr 16, 2020 at 09:56:40AM +0200, Eugenio Pérez wrote:
> > As updated in ("2a2d1382fe9d virtio: Add improved queue allocation API")
> >
> > Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
>
> Pls add motivation for these changes.
>

The original motivation was to make code as close as possible to
virtio_net. Also, it skips a (probably not expensive) initialization
in vring_new_virtqueue.

With the recent events, I think that this could be useful to test when
userspace and kernel use different struct layout, maybe with some
sanitizer. I can drop it if you don't see it the same way (or if I
didn't understand the problem and this does not help).

Thanks!

> > ---
> >  tools/virtio/virtio_test.c | 7 +++----
> >  1 file changed, 3 insertions(+), 4 deletions(-)
> >
> > diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
> > index 1d5144590df6..d9827b640c21 100644
> > --- a/tools/virtio/virtio_test.c
> > +++ b/tools/virtio/virtio_test.c
> > @@ -106,10 +106,9 @@ static void vq_info_add(struct vdev_info *dev, int num)
> >       assert(r >= 0);
> >       memset(info->ring, 0, vring_legacy_size(num, 4096));
> >       vring_legacy_init(&info->vring, num, info->ring, 4096);
> > -     info->vq = vring_new_virtqueue(info->idx,
> > -                                    info->vring.num, 4096, &dev->vdev,
> > -                                    true, false, info->ring,
> > -                                    vq_notify, vq_callback, "test");
> > +     info->vq =
> > +             __vring_new_virtqueue(info->idx, info->vring, &dev->vdev, true,
> > +                                   false, vq_notify, vq_callback, "test");
> >       assert(info->vq);
> >       info->vq->priv = info;
> >       vhost_vq_setup(dev, info);
> > --
> > 2.18.1
>