Re: [Xen-devel] [PATCH] Pass-through a graphic card

[Samuel Thibault <samuel.thibault@xxxxxxxxxxxxx>]

Jean Guyader, le Fri 09 May 2008 12:11:44 +0100, a écrit :
>   - Then we start qemu with the new option -enable-dom0 to have the 
> dom0's keyboard and the mouse redirected into the guest.

I would suggest to a more expressive name, like -dom0-input

> Be careful, vnc must be at 0.

Can't you have the dom0 option override the vnc option?

> +    if (!(mem = fopen("/dev/mem", "r")))
> +        return 0;
> +
> +    fseek(mem, start, SEEK_SET);
> +    fread(buf, 1, size, mem);
> +    fclose(mem);

Mmm, no need for f functionnalities, you can just replace it with
open/lseek/read/close.

> +    bios_size = linux_get_vgabios(xc_handle, bios, 128 * 1024);
> +
> +    if (bios_size <= 0)
> +    {
> +        free(bios);
> +        return -1;
> +    }
> +    
> +    va_bios = xc_map_foreign_range(xc_handle, dom, 16 * XC_PAGE_SIZE,

use bios_size here instead?

> +                                   PROT_READ | PROT_WRITE, pfn);
> +
> +    memcpy(va_bios, bios, bios_size);
> +    hvm_info->vga_bios_paddr = pfn << XC_PAGE_SHIFT; 
> +    hvm_info->vga_bios_size = bios_size;
> +    munmap(va_bios, 16 * XC_PAGE_SIZE);
> +    free(bios);
> +
> +    rc |= xc_domain_memory_mapping(xc_handle, dom,
> +                                   0xa0000 >> XC_PAGE_SHIFT,
> +                                   0xa0000 >> XC_PAGE_SHIFT,
> +                                   2 * 16, 1);

use (0xc0000 - 0xa0000) >> XC_PAGE_SHIFT instead?

> @@ -190,7 +303,7 @@ static int setup_guest(int xc_handle,
>          goto error_out;
>      }
>  
> -    IPRINTF("VIRTUAL MEMORY ARRANGEMENT:\n"
> +    fprintf(stderr, "VIRTUAL MEMORY ARRANGEMENT:\n"
>              "  Loader:        %016"PRIx64"->%016"PRIx64"\n"
>              "  TOTAL:         %016"PRIx64"->%016"PRIx64"\n"

Mmm, I guess you should not change that :)

Samuel

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