From 9526f9a2b762af16be94a72aca5d65c677d28f50 Mon Sep 17 00:00:00 2001 From: Eric Auger Date: Tue, 17 Jan 2023 10:15:18 -0500 Subject: vhost/net: Clear the pending messages when the backend is removed 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. As vhost does not have any explicit reset user API, VHOST_NET_SET_BACKEND looks a reasonable point where to clear the pending messages, in case the backend is removed. Export vhost_clear_msg() and call it in vhost_net_set_backend() when fd == -1. Signed-off-by: Eric Auger Suggested-by: Jason Wang Fixes: 6b1e6cc7855b0 ("vhost: new device IOTLB API") Message-Id: <20230117151518.44725-3-eric.auger@redhat.com> Signed-off-by: Michael S. Tsirkin --- drivers/vhost/vhost.h | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/vhost/vhost.h') diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index d9109107af08..790b296271f1 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -181,6 +181,7 @@ long vhost_dev_ioctl(struct vhost_dev *, unsigned int ioctl, void __user *argp); long vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *argp); bool vhost_vq_access_ok(struct vhost_virtqueue *vq); bool vhost_log_access_ok(struct vhost_dev *); +void vhost_clear_msg(struct vhost_dev *dev); int vhost_get_vq_desc(struct vhost_virtqueue *, struct iovec iov[], unsigned int iov_count, -- cgit v1.2.1