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| author | Akihiko Odaki <akihiko.odaki@daynix.com> | 2024-07-15 14:19:08 +0900 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2024-07-22 20:15:41 -0400 |
| commit | ca6dd3aef8a103138c99788bcba8195d4905ddc5 (patch) | |
| tree | d1303adf63df951547bb73ae9f5b1dfa665107cf | |
| parent | 99d7c1b99a3fdb69213c09da6b7614243f877bee (diff) | |
| download | qemu-ca6dd3aef8a103138c99788bcba8195d4905ddc5.zip qemu-ca6dd3aef8a103138c99788bcba8195d4905ddc5.tar.gz qemu-ca6dd3aef8a103138c99788bcba8195d4905ddc5.tar.bz2 | |
hw/pci: Fix SR-IOV VF number calculation
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: <20240715-sriov-v5-2-3f5539093ffc@daynix.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
| -rw-r--r-- | hw/pci/pci.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/hw/pci/pci.c b/hw/pci/pci.c index 4c7be52..cf27948 100644 --- a/hw/pci/pci.c +++ b/hw/pci/pci.c @@ -1437,7 +1437,11 @@ 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); |