linux-kernel - [PATCH 6.6 606/638] vdpa

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Message-ID: <20240324230116.1348576-607-sashal@kernel.org>
Date: Sun, 24 Mar 2024 19:00:43 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Steve Sistare <steven.sistare@...cle.com>,
	Eugenio Pérez <eperezma@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	"Michael S . Tsirkin" <mst@...hat.com>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.6 606/638] vdpa_sim: reset must not run

From: Steve Sistare <steven.sistare@...cle.com>

[ Upstream commit 9588e7fc511f9c55b9835f14916e90ab940061b7 ]

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_DRIVER_OK
is set.

Fixes: 0c89e2a3a9d0 ("vdpa_sim: Implement suspend vdpa op")
Signed-off-by: Steve Sistare <steven.sistare@...cle.com>
Reviewed-by: Eugenio Pérez <eperezma@...hat.com>
Acked-by: Jason Wang <jasowang@...hat.com>
Message-Id: <1707517807-137331-1-git-send-email-steven.sistare@...cle.com>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 76d41058add9a..421ab01ef06ba 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -158,7 +158,7 @@ static void vdpasim_do_reset(struct vdpasim *vdpasim)
 		vdpasim->iommu_pt[i] = true;
 	}
 
-	vdpasim->running = true;
+	vdpasim->running = false;
 	spin_unlock(&vdpasim->iommu_lock);
 
 	vdpasim->features = 0;
@@ -477,6 +477,7 @@ static void vdpasim_set_status(struct vdpa_device *vdpa, u8 status)
 
 	mutex_lock(&vdpasim->mutex);
 	vdpasim->status = status;
+	vdpasim->running = (status & VIRTIO_CONFIG_S_DRIVER_OK) != 0;
 	mutex_unlock(&vdpasim->mutex);
 }
 
-- 
2.43.0