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s390x/pci: only limit DMA aperture if vfio DMA limit reported

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If the host kernel lacks vfio DMA limit reporting, do not attempt
to shrink the guest DMA aperture.

Fixes: df202e3ff3 ("s390x/pci: shrink DMA aperture to be bound by vfio DMA limit")
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Message-ID: <20231110175108.465851-3-mjrosato@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
(cherry picked from commit 8011b508cf)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Matthew Rosato 2023-11-10 12:51:08 -05:00 committed by Michael Tokarev
parent 150ebd076e
commit 25f55508fc
1 changed files with 1 additions and 1 deletions
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hw/s390x/s390-pci-vfio.c
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@ -132,7 +132,7 @@ static void s390_pci_read_base(S390PCIBusDevice *pbdev,
* to the guest based upon the vfio DMA limit.
*/
vfio_size = pbdev->iommu->max_dma_limit << TARGET_PAGE_BITS;
if (vfio_size < (cap->end_dma - cap->start_dma + 1)) {
if (vfio_size > 0 && vfio_size < cap->end_dma - cap->start_dma + 1) {
pbdev->zpci_fn.edma = cap->start_dma + vfio_size - 1;
}
}