[Qemu-devel] Re: qemu svn r5281 on FreeBSD - slow usb, vmwarevga, screen updates... (now updated to r5313)

[Anthony Liguori]

Juergen Lock wrote:
> On Fri, Sep 26, 2008 at 10:04:28AM -0500, Anthony Liguori wrote:
>   
>> Matt wrote:
>>     
>>>>  Here is another experimental update that forces -lthr on 6.x, and
>>>> also updates to qemu svn r5313:
>>>>        http://people.freebsd.org/~nox/qemu/qemu-devel-20080924.patch
>>>>     
>>>>         
>>> I just built this update and it seems to have fixed the issue.  Host
>>> CPU usage again tracks with guest CPU usage and all seems well.  I'll
>>> continue to use this build to see if anything else crops up.
>>>
>>> Please let me know if there is anything other information I can provide.
>>>   
>>>       
>> If ya'll have patches to make QEMU work on FreeBSD, please submit them.  
>> I'm about to commit a patch that's what it took for me to get SVN working 
>> on FreeBSD.
>>
>> The one thing that really tripped me up with the whole aio kld-module 
>> thing.  Perhaps we should detect the presence of the module at run time and 
>> disable aio?  I assume kldload can only be run as root?
>>     
>
> Yes.  Atm the ports print a warning when aio is not loaded:
>   

Yeah, I don't think this is enough.  I'd rather see AIO be disabled when 
modfind("aio") is not available (printing a warning along with that 
would be fine).  A non-privileged user cannot load the aio module so 
it's not very useful to tell them to load it.

>  And here is another patch thats needed on amd64 hosts for tcg (which
> I had posted before:)
>
> Index: qemu/exec.c
> @@ -405,6 +405,28 @@
>              exit(1);
>          }
>      }
> +#elif defined(__FreeBSD__)
> +    {
> +        int flags;
> +        void *addr = NULL;
> +        flags = MAP_PRIVATE | MAP_ANONYMOUS;
> +#if defined(__x86_64__)
> +        /* FreeBSD doesn't have MAP_32BIT, use MAP_FIXED and assume
> +         * 0x40000000 is free */
> +        flags |= MAP_FIXED;
> +        addr = (void *)0x40000000;
> +        /* Cannot map more than that */
> +        if (code_gen_buffer_size > (800 * 1024 * 1024))
> +            code_gen_buffer_size = (800 * 1024 * 1024);
> +#endif
> +        code_gen_buffer = mmap(addr, code_gen_buffer_size,
> +                               PROT_WRITE | PROT_READ | PROT_EXEC, 
> +                               flags, -1, 0);
> +        if (code_gen_buffer == MAP_FAILED) {
> +            fprintf(stderr, "Could not allocate dynamic translator buffer\n");
> +            exit(1);
> +        }
> +    }
>  #else
>      code_gen_buffer = qemu_malloc(code_gen_buffer_size);
>      if (!code_gen_buffer) {
>
> Signed-off-by: Juergen Lock <nox at jelal.kn-bremen.de>
>   

Applied.  Thanks.

>  I'll see if I can prepare another update over the weekend and then go
> thru more of the patches that have accumulated in the port...
>   

That would be great!

Regards,

Anthony Liguori

>  Thanx,
> 	Juergen
>