Re: [uml-devel] virtual framebuffer device visible on host

[Antoine Martin <antoine@nagafix.co.uk>]

Geert,

Thanks for that, the patch is quite small and still applies without too 
much effort to 2.6.17 (a lot of the rejects are whitespace/no change)
Is there any reason not to merge this? Is it hackish or something?


I've only compile tested it here since it seems I can't run any guests 
kernels since I updated to gcc4.1.1/glibc2.4, but I will certainly 
revisit this code once mainline is fixed.

As I mentioned yesterday, older kernels die with:
"cannot set up thread-local storage: set_thread_area failed when setting 
up thread-local storage"
And newer (~ 2.6.16 onwards) fail even quicker on my desktop:
# ./kernel32-2.6.17.11-x11-fb ubd0=./FedoraCore5-x86-root_fs
Checking that ptrace can change system call numbers...OK
Checking syscall emulation patch for ptrace...missing
Checking for tmpfs mount on /dev/shm...nothing mounted on /dev/shm
Checking PROT_EXEC mmap in /tmp/...OK
Checking for the skas3 patch in the host:
   - /proc/mm...not found
   - PTRACE_FAULTINFO...not found
   - PTRACE_LDT...not found
UML running in SKAS0 mode
remove_umid_dir - actually_do_remove failed with err = -2


Geert Uytterhoeven wrote:
> On Wed, 6 Sep 2006, Antoine Martin wrote:
>> Just a thought, but how hard would it be to have a virtual device in the 
>> guests that mimics a framebuffer device and is in fact an X window on 
>> the host? I think this could almost be a killer-app.
>> Or is there already a way to do this using VFB?
>> Surely an X window is rich enough to provide all the primitives that a 
>> framebuffer device provides?
> 
> It's been done before (but not yet in mainline), cfr.
> http://www.gatago.com/linux/kernel/6105868.html.
> 
> Gr{oetje,eeting}s,
> 
> 						Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> 							    -- Linus Torvalds
> 


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