Reference:https://bugzilla.tianocore.org/show_bug.cgi?id=3804
When calculating SR-IOV reserve bus in function CreatePciIoDevice(), there are two points may have problem. LastVF = PFRid + FirstVFOffset + (PciIoDevice->InitialVFs - 1) * VFStride; PciIoDevice->ReservedBusNum = (UINT16)(EFI_PCI_BUS_OF_RID (LastVF) - Bus + 1); The first is that if the value of PciIoDevice->InitialVFs is 0, it will cause overflow, it's better to check InitialVFs before used. The second is that if number of bus is not enough for all PF and still allocate bus for VF, it will lead to PCI enumerating failure. Cc: Jian J Wang <jian.j.w...@intel.com> Cc: Liming Gao <gaolim...@byosoft.com.cn> Cc: Hao A Wu <hao.a...@intel.com> Cc: Ray Ni <ray...@intel.com> Signed-off-by: Wenyi Xie <xiewen...@huawei.com> --- MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c index 9251388bc268..a4d1db534276 100644 --- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c +++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c @@ -2402,12 +2402,12 @@ CreatePciIoDevice ( // Calculate LastVF // PFRid = EFI_PCI_RID (Bus, Device, Func); - LastVF = PFRid + FirstVFOffset + (PciIoDevice->InitialVFs - 1) * VFStride; + LastVF = PFRid + FirstVFOffset + (PciIoDevice->InitialVFs == 0 ? 0 : PciIoDevice->InitialVFs - 1) * VFStride; // // Calculate ReservedBusNum for this PF // - PciIoDevice->ReservedBusNum = (UINT16)(EFI_PCI_BUS_OF_RID (LastVF) - Bus + 1); + PciIoDevice->ReservedBusNum = (UINT16)(EFI_PCI_BUS_OF_RID (LastVF) - Bus); DEBUG (( DEBUG_INFO, -- 2.20.1.windows.1 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#85712): https://edk2.groups.io/g/devel/message/85712 Mute This Topic: https://groups.io/mt/88417561/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-