2024-01-10 20:43:46

by Steven Sistare

Subject: [RFC V1 09/13] vdpa_sim: reset must not run

vdpasim_do_reset sets running to true, which is wrong, as it allows
vdpasim_kick_vq to post work requests before the device has been
configured. To fix, do not set running until VIRTIO_CONFIG_S_FEATURES_OK
is set.

Signed-off-by: Steve Sistare <[email protected]>
---
drivers/vdpa/vdpa_sim/vdpa_sim.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
index be2925d0d283..6304cb0b4770 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -160,7 +160,7 @@ static void vdpasim_do_reset(struct vdpasim *vdpasim, u32 flags)
}
}

- vdpasim->running = true;
+ vdpasim->running = false;
spin_unlock(&vdpasim->iommu_lock);

vdpasim->features = 0;
@@ -483,6 +483,7 @@ static void vdpasim_set_status(struct vdpa_device *vdpa, u8 status)

mutex_lock(&vdpasim->mutex);
vdpasim->status = status;
+ vdpasim->running = (status & VIRTIO_CONFIG_S_FEATURES_OK) != 0;
mutex_unlock(&vdpasim->mutex);
}

--
2.39.3

2024-01-16 18:33:57

by Eugenio Perez Martin

Subject: Re: [RFC V1 09/13] vdpa_sim: reset must not run

On Wed, Jan 10, 2024 at 9:40 PM Steve Sistare <[email protected]> wrote:
>
> vdpasim_do_reset sets running to true, which is wrong, as it allows
> vdpasim_kick_vq to post work requests before the device has been
> configured. To fix, do not set running until VIRTIO_CONFIG_S_FEATURES_OK
> is set.
>
> Signed-off-by: Steve Sistare <[email protected]>

Good catch, thanks! Please send this separately so it can be merged
independently.

Also, the Fixes tag is missing, isn't it?

Fixes: 0c89e2a3a9d0 ("vdpa_sim: Implement suspend vdpa op")

Reviewed-by: Eugenio Pérez <[email protected]>

> ---
> drivers/vdpa/vdpa_sim/vdpa_sim.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> index be2925d0d283..6304cb0b4770 100644
> --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
> +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> @@ -160,7 +160,7 @@ static void vdpasim_do_reset(struct vdpasim *vdpasim, u32 flags)
> }
> }
>
> - vdpasim->running = true;
> + vdpasim->running = false;
> spin_unlock(&vdpasim->iommu_lock);
>
> vdpasim->features = 0;
> @@ -483,6 +483,7 @@ static void vdpasim_set_status(struct vdpa_device *vdpa, u8 status)
>
> mutex_lock(&vdpasim->mutex);
> vdpasim->status = status;
> + vdpasim->running = (status & VIRTIO_CONFIG_S_FEATURES_OK) != 0;
> mutex_unlock(&vdpasim->mutex);
> }
>
> --
> 2.39.3
>