why assume the bar0 is 32bit in gpuSetupVirtualGuestOwnedHW()

[Cordius]

In the following code snippet in gpuSetupVirtualGuestOwnedHW, driver assume the bar0 is a 32-bit bar and then read the NV_CONFIG_PCI_NV_5 to determine whether the bar1 is a 64-bit bar or not.

But I know some gpu like H20/H100/GB200 have a 64-bit bar0, is it a bug for the implementation ?

if (!IS_VIRTUAL_WITH_SRIOV(pGpu) && !IS_VIRTUAL(pGpu))
    {
 
        cfgBaseAddressLow = osPciReadDword(handle, NV_CONFIG_PCI_NV_5);

        if (!IS_BAR_64(cfgBaseAddressLow))
        {
            if (osPciReadDword(handle, NV_CONFIG_PCI_NV_6) != 0)
            {
                // We can access the BAR2 from 0x18, so the BAR2 is moved by host.
                pGpu->bBar2MovedByVtd = NV_TRUE;
                NV_PRINTF(LEVEL_WARNING, "VT-d moved BAR2 to 0x18!\n");
            }
            else
            {
                NV_PRINTF(LEVEL_WARNING, "VT-d still keeps BAR2 at 0x1C!\n");
            }
        }
        else
        {
            pGpu->bBar1Is64Bit = NV_TRUE;
            NV_PRINTF(LEVEL_WARNING, "VT-d is using a 64bit BAR1!\n");
        }

        pGpu->bIsPassthru = NV_TRUE;

        NV_PRINTF(LEVEL_WARNING,
                  "GPU at domain: %d bus: %d, device: %d is virtual (HW passthrough mode).\n",
                  domain, bus, device);
    }