From: Cindy Lu Date: Thu, 20 Apr 2023 15:17:34 +0000 (+0800) Subject: vhost_vdpa: fix unmap process in no-batch mode X-Git-Tag: v6.1.63~5608 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2f5aa54e40514b34ea3b43afea206c44fd9d1fb4;p=sdk%2Femulator%2Femulator-kernel.git vhost_vdpa: fix unmap process in no-batch mode commit c82729e06644f4e087f5ff0f91b8fb15e03b8890 upstream. While using the vdpa device with vIOMMU enabled in the guest VM, when the vdpa device bind to vfio-pci and run testpmd then system will fail to unmap. The test process is Load guest VM --> attach to virtio driver--> bind to vfio-pci driver So the mapping process is 1)batched mode map to normal MR 2)batched mode unmapped the normal MR 3)unmapped all the memory 4)mapped to iommu MR This error happened in step 3). The iotlb was freed in step 2) and the function vhost_vdpa_process_iotlb_msg will return fail Which causes failure. To fix this, we will not remove the AS while the iotlb->nmaps is 0. This will free in the vhost_vdpa_clean Cc: stable@vger.kernel.org Fixes: aaca8373c4b1 ("vhost-vdpa: support ASID based IOTLB API") Signed-off-by: Cindy Lu Message-Id: <20230420151734.860168-1-lulu@redhat.com> Signed-off-by: Michael S. Tsirkin Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index b7657984dd8d..6f532da59e08 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -819,11 +819,7 @@ static void vhost_vdpa_unmap(struct vhost_vdpa *v, if (!v->in_batch) ops->set_map(vdpa, asid, iotlb); } - /* If we are in the middle of batch processing, delay the free - * of AS until BATCH_END. - */ - if (!v->in_batch && !iotlb->nmaps) - vhost_vdpa_remove_as(v, asid); + } static int vhost_vdpa_va_map(struct vhost_vdpa *v, @@ -1080,8 +1076,6 @@ static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev, u32 asid, if (v->in_batch && ops->set_map) ops->set_map(vdpa, asid, iotlb); v->in_batch = false; - if (!iotlb->nmaps) - vhost_vdpa_remove_as(v, asid); break; default: r = -EINVAL;