diff options
| author | Matthew Rosato <mjrosato@linux.ibm.com> | 2023-11-10 12:51:08 -0500 |
|---|---|---|
| committer | Michael Tokarev <mjt@tls.msk.ru> | 2023-11-19 21:15:06 +0300 |
| commit | 25f55508fc53ed5b0ca90a0b1b158e7d6accb487 (patch) | |
| tree | eda9a0fd51eb7d431cd1d00d1f7fde9fcc2033ac | |
| parent | 150ebd076e4aff712a7e098ff59fc962dc218697 (diff) | |
s390x/pci: only limit DMA aperture if vfio DMA limit reported
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 8011b508cf0ddbdbda03820f4fa6cd484a6d9aed)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
| -rw-r--r-- | hw/s390x/s390-pci-vfio.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/hw/s390x/s390-pci-vfio.c b/hw/s390x/s390-pci-vfio.c index 59a2e03873..4f6f61f02e 100644 --- a/hw/s390x/s390-pci-vfio.c +++ b/hw/s390x/s390-pci-vfio.c @@ -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; } } |