On Wed, Feb 9, 2011 at 4:33 PM, Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx> wrote: > > Prasad Joshi wrote: > >> I was previously seeing a problem with the ROM BIOS, but I could solve >> it by passing a correct BIOS file in function assigned_initfn. For now >> I am using hardcoded file name in the code. > > Did you recheck video bios inside guest? (for example in sysfs) > For GPU cards on my machine, reading from the /sys/bus/pci/devices/<device>/ rom always give error 'Invalid Argument'. I had to extract the BIOS using some utilities. The BIOS seems to be correct as I have been able to pass-through a old Nvidia (NVS 290) and old ATI (RV370 FireGL V3100) card to Ubuntu Guest OS. > > If this is bootstrap vga, guest linux kernel will use bios copy placed at 0xc0000. > But in my setup qemu can only pass first 32k of option-roms, > due to curruption at seabios shadow-copying stage. > (seems like because improper i440fx PAM registers emulation) I am not sure if it is related to the problem you are facing. The current SeaBIOS has very limited pci memory space from 0xf0000000 to 0xfec00000 (236MB). This includes everything, prefectable and non-prefecthable memory. The range is very small for VGA cards to work. I have modified the memory range on my machine for prefectable memory. There is one bug in qemu-kvm code, which acidently detects the prefectable memory as non-prefectable. I had sent a patch to correct this behavior yesterday. Hope it gets accepted. Thanks and Regards, Prasad -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
