Hi,
>Hi all,
>
>I've tried to filter out parts of XCI that are relevant to VGA
>passthrough (most, if not all, are Jean Guyader's work) and apply them
>to Xen unstable. The patch doesn't work with changeset 19597. I'm not
>sure why. But I've gotten DomU to boot up showing only the physical gfx
>on previous changesets. I didn't have a chance to test the gfx
>functionalities though. I made a lot of simplifications, such as
>excluding user options, and ignoring HID passthrough for now. The patch
>is hardcoded for VGA passthrough on HVM guests. The reason is really to
>study which are the parts really affect VGA passthrough, and of course
>ultimately getting VGA passthrough to work.
>
>This may seem like taking a step backwards, but I think there are many
>people out there who are new, like me, and are really interested to
>understand and get VGA passthrough to work correctly. I'm hoping that
>experts out there can provide constructive criticism on this patch, and
>of course provide suggestions on how to make this patch work for the
>latest changeset.
>
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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