netdev - [RFC] vhost: Clear the pending messages on vhost_init_device

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Date:   Mon,  7 Nov 2022 21:34:31 +0100
From:   Eric Auger <eric.auger@...hat.com>
To:     eric.auger.pro@...il.com, eric.auger@...hat.com, mst@...hat.com,
        jasowang@...hat.com, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     peterx@...hat.com
Subject: [RFC] vhost: Clear the pending messages on vhost_init_device_iotlb()

When the vhost iotlb is used along with a guest virtual iommu
and the guest gets rebooted, some MISS messages may have been
recorded just before the reboot and spuriously executed by
the virtual iommu after the reboot. Despite the device iotlb gets
re-initialized, the messages are not cleared. Fix that by calling
vhost_clear_msg() at the end of vhost_init_device_iotlb().

Signed-off-by: Eric Auger <eric.auger@...hat.com>
---
 drivers/vhost/vhost.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 40097826cff0..422a1fdee0ca 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -1751,6 +1751,7 @@ int vhost_init_device_iotlb(struct vhost_dev *d, bool enabled)
 	}

 	vhost_iotlb_free(oiotlb);
+	vhost_clear_msg(d);

 	return 0;
 }
-- 
2.37.3