with max-bytes set to 0, quota is 0 and so device does not work.
block this to avoid user confusion

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/virtio/virtio-rng.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/hw/virtio/virtio-rng.c b/hw/virtio/virtio-rng.c
index f74efffef7..7cf31da071 100644
--- a/hw/virtio/virtio-rng.c
+++ b/hw/virtio/virtio-rng.c
@@ -184,8 +184,9 @@ static void virtio_rng_device_realize(DeviceState *dev, Error **errp)
 
     /* Workaround: Property parsing does not enforce unsigned integers,
      * So this is a hack to reject such numbers. */
-    if (vrng->conf.max_bytes > INT64_MAX) {
-        error_setg(errp, "'max-bytes' parameter must be non-negative, "
+    if (vrng->conf.max_bytes == 0 ||
+        vrng->conf.max_bytes > INT64_MAX) {
+        error_setg(errp, "'max-bytes' parameter must be positive, "
                    "and less than 2^63");
         return;
     }
-- 
MST

On 24/07/2024 12:51, Michael S. Tsirkin wrote:
> with max-bytes set to 0, quota is 0 and so device does not work.
> block this to avoid user confusion
> 
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> ---
>   hw/virtio/virtio-rng.c | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/virtio/virtio-rng.c b/hw/virtio/virtio-rng.c
> index f74efffef7..7cf31da071 100644
> --- a/hw/virtio/virtio-rng.c
> +++ b/hw/virtio/virtio-rng.c
> @@ -184,8 +184,9 @@ static void virtio_rng_device_realize(DeviceState *dev, Error **errp)
>   
>       /* Workaround: Property parsing does not enforce unsigned integers,
>        * So this is a hack to reject such numbers. */
> -    if (vrng->conf.max_bytes > INT64_MAX) {
> -        error_setg(errp, "'max-bytes' parameter must be non-negative, "
> +    if (vrng->conf.max_bytes == 0 ||
> +        vrng->conf.max_bytes > INT64_MAX) {
> +        error_setg(errp, "'max-bytes' parameter must be positive, "
>                      "and less than 2^63");
>           return;
>       }

Michael, do you plan to send the PR yourself? Or perhaps it can go via trivial?

Thanks,
Laurent

On Tue, Jul 30, 2024 at 11:07:11AM +0200, Laurent Vivier wrote:
> On 24/07/2024 12:51, Michael S. Tsirkin wrote:
> > with max-bytes set to 0, quota is 0 and so device does not work.
> > block this to avoid user confusion
> > 
> > Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> > ---
> >   hw/virtio/virtio-rng.c | 5 +++--
> >   1 file changed, 3 insertions(+), 2 deletions(-)
> > 
> > diff --git a/hw/virtio/virtio-rng.c b/hw/virtio/virtio-rng.c
> > index f74efffef7..7cf31da071 100644
> > --- a/hw/virtio/virtio-rng.c
> > +++ b/hw/virtio/virtio-rng.c
> > @@ -184,8 +184,9 @@ static void virtio_rng_device_realize(DeviceState *dev, Error **errp)
> >       /* Workaround: Property parsing does not enforce unsigned integers,
> >        * So this is a hack to reject such numbers. */
> > -    if (vrng->conf.max_bytes > INT64_MAX) {
> > -        error_setg(errp, "'max-bytes' parameter must be non-negative, "
> > +    if (vrng->conf.max_bytes == 0 ||
> > +        vrng->conf.max_bytes > INT64_MAX) {
> > +        error_setg(errp, "'max-bytes' parameter must be positive, "
> >                      "and less than 2^63");
> >           return;
> >       }
> 
> Michael, do you plan to send the PR yourself? Or perhaps it can go via trivial?
> 
> Thanks,
> Laurent

I will pick it up, I do not think this is appropriate for trivial though.

-- 
MST

On 24/7/24 12:51, Michael S. Tsirkin wrote:
> with max-bytes set to 0, quota is 0 and so device does not work.
> block this to avoid user confusion
> 
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> ---
>   hw/virtio/virtio-rng.c | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>

On Wed, 2024-07-24 at 06:51 -0400, Michael S. Tsirkin wrote:
> with max-bytes set to 0, quota is 0 and so device does not work.
> block this to avoid user confusion
> 
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> ---
>  hw/virtio/virtio-rng.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/virtio/virtio-rng.c b/hw/virtio/virtio-rng.c
> index f74efffef7..7cf31da071 100644
> --- a/hw/virtio/virtio-rng.c
> +++ b/hw/virtio/virtio-rng.c
> @@ -184,8 +184,9 @@ static void virtio_rng_device_realize(DeviceState
> *dev, Error **errp)
>  
>      /* Workaround: Property parsing does not enforce unsigned
> integers,
>       * So this is a hack to reject such numbers. */
> -    if (vrng->conf.max_bytes > INT64_MAX) {
> -        error_setg(errp, "'max-bytes' parameter must be non-
> negative, "
> +    if (vrng->conf.max_bytes == 0 ||
> +        vrng->conf.max_bytes > INT64_MAX) {
> +        error_setg(errp, "'max-bytes' parameter must be positive, "
>                     "and less than 2^63");
>          return;
>      }

Reviewed-by: Amit Shah <amit@kernel.org>

On 24/07/2024 12:51, Michael S. Tsirkin wrote:
> with max-bytes set to 0, quota is 0 and so device does not work.
> block this to avoid user confusion
> 
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> ---
>   hw/virtio/virtio-rng.c | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/virtio/virtio-rng.c b/hw/virtio/virtio-rng.c
> index f74efffef7..7cf31da071 100644
> --- a/hw/virtio/virtio-rng.c
> +++ b/hw/virtio/virtio-rng.c
> @@ -184,8 +184,9 @@ static void virtio_rng_device_realize(DeviceState *dev, Error **errp)
>   
>       /* Workaround: Property parsing does not enforce unsigned integers,
>        * So this is a hack to reject such numbers. */
> -    if (vrng->conf.max_bytes > INT64_MAX) {
> -        error_setg(errp, "'max-bytes' parameter must be non-negative, "
> +    if (vrng->conf.max_bytes == 0 ||
> +        vrng->conf.max_bytes > INT64_MAX) {
> +        error_setg(errp, "'max-bytes' parameter must be positive, "
>                      "and less than 2^63");
>           return;
>       }

Reviewed-by: Laurent Vivier <lvivier@redhat.com>