[PATCH v2 1/2] s390x/pci: bypass vfio DMA counting when using cdev

[Matthew Rosato <mjrosato@linux.ibm.com>]

The current code assumes that there is always a vfio group, but
that's no longer guaranteed with the iommufd backend when using
cdev.  In this case, we don't need to track the vfio dma limit
anyway.

Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
---
 hw/s390x/s390-pci-vfio.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/s390x/s390-pci-vfio.c b/hw/s390x/s390-pci-vfio.c
index 59a2e03873..e28573b593 100644
--- a/hw/s390x/s390-pci-vfio.c
+++ b/hw/s390x/s390-pci-vfio.c
@@ -66,6 +66,10 @@ S390PCIDMACount *s390_pci_start_dma_count(S390pciState *s,
 
     assert(vpdev);
 
+    if (!vpdev->vbasedev.group) {
+        return NULL;
+    }
+
     id = vpdev->vbasedev.group->container->fd;
 
     if (!s390_pci_update_dma_avail(id, &avail)) {
-- 
2.41.0