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hw/pci: Fix SR-IOV VF number calculation

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pci_config_get_bar_addr() had a division by vf_stride. vf_stride needs
to be non-zero when there are multiple VFs, but the specification does
not prohibit to make it zero when there is only one VF.

Do not perform the division for the first VF to avoid division by zero.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-Id: <20250314-sriov-v9-2-57dae8ae3ab5@daynix.com>
Tested-by: Yui Washizu <yui.washidu@gmail.com>
Tested-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Akihiko Odaki 2025-03-14 15:14:51 +09:00 • committed by Michael S. Tsirkin
parent 3a031e395d
commit a5745ac183
1 changed files with 5 additions and 1 deletions
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6
hw/pci/pci.c
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@ -1594,7 +1594,11 @@ static pcibus_t pci_config_get_bar_addr(PCIDevice *d, int reg,
pci_get_word(pf->config + sriov_cap + PCI_SRIOV_VF_OFFSET);
uint16_t vf_stride =
pci_get_word(pf->config + sriov_cap + PCI_SRIOV_VF_STRIDE);
uint32_t vf_num = (d->devfn - (pf->devfn + vf_offset)) / vf_stride;
uint32_t vf_num = d->devfn - (pf->devfn + vf_offset);
if (vf_num) {
vf_num /= vf_stride;
}
if (type & PCI_BASE_ADDRESS_MEM_TYPE_64) {
new_addr = pci_get_quad(pf->config + bar);