Re: [Xen-devel] Getting VGA Passthrough to work on Xen Unstable

["Beng Heng, Ng" <bengheng@xxxxxxxxxxxxxx>]

Hi Akio,

Thanks for the reply. I didn't make any changes to pci_load_option_roms.
Did you mean pci_setup? :)

- Beng Heng

Akio Takebe wrote:
> Hi,
> 
> I suspect the VGA rom doesn't be loaded.
> pci_load_option_roms() loads only mass stroage devices and serial bus 
> controller.
> You need to remove the ckeck.
> 
> @tools/firmware/hvmloader/hvmloader.c
>  476 static int pci_load_option_roms(uint32_t rom_base_addr)
>  477 {
>  478     uint32_t option_rom_addr, rom_phys_addr = rom_base_addr;
>  479     uint16_t vendor_id, device_id;
>  480     uint8_t devfn, class;
>  481 
>  482     for ( devfn = 0; devfn < 128; devfn++ )
>  483     {
>  484         class     = pci_readb(devfn, PCI_CLASS_DEVICE + 1);
>  485         vendor_id = pci_readw(devfn, PCI_VENDOR_ID);
>  486         device_id = pci_readw(devfn, PCI_DEVICE_ID);
>  487 
>  488         if ( (vendor_id == 0xffff) && (device_id == 0xffff) )
>  489             continue;
>  490 
>  491         /*
>  492          * Currently only scan options from mass storage devices and 
> serial
>  493          * bus controller (Fibre Channel included).
>  494          */
>  495         if ( (class != 0x1) && (class != 0xc) )
>  496             continue;
>  497 
>  498         option_rom_addr = pci_readl(devfn, PCI_ROM_ADDRESS);
>  499         if ( !option_rom_addr )
>  500             continue;
>  501 
>  502         /* Ensure Expansion Bar is enabled before copying */
>  503         pci_writel(devfn, PCI_ROM_ADDRESS, option_rom_addr | 0x1);
>  504 
>  505         rom_phys_addr += scan_option_rom(
>  506             devfn, vendor_id, device_id,
>  507             (void *)(option_rom_addr & ~2047), rom_phys_addr);
>  508 
>  509         /* Restore the default original value of Expansion Bar */
>  510         pci_writel(devfn, PCI_ROM_ADDRESS, option_rom_addr);
>  511     }
>  512 
>  513     return rom_phys_addr - rom_base_addr;
>  514 }
>  
> Best Regards,
> 
> Akio Takebe

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