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However, that assumption only holds in an environment where VF BAR size can't be modified. Add an additional check that verifies that VF BAR for all enabled VFs fits within the underlying reservation resource. Signed-off-by: Michał Winiarski --- drivers/pci/iov.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index 79143c1bc7bb4..5de828e5a26ea 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -645,10 +645,14 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn) nres = 0; for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { + int vf_bar_sz = pci_iov_resource_size(dev, + pci_resource_to_iov(i)); bars |= (1 << pci_resource_to_iov(i)); res = &dev->resource[pci_resource_to_iov(i)]; - if (res->parent) - nres++; + if (!res->parent || vf_bar_sz * nr_virtfn > resource_size(res)) + continue; + + nres++; } if (nres != iov->nres) { pci_err(dev, "not enough MMIO resources for SR-IOV\n");