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s390x/pci: bypass vfio DMA counting when using cdev 

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>
Message-ID: <20231110175108.465851-2-mjrosato@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Matthew Rosato 2023-11-10 12:51:07 -05:00 committed by Thomas Huth
parent 34aee9c946
commit 0ab3565840
1 changed files with 4 additions and 0 deletions
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4
hw/s390x/s390-pci-vfio.c
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@ -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)) {