Re: [Qemu-devel] Question about default floppy and stdvga memory

[Fabio Fantoni]

Il 04/02/2013 10:41, Fabio Fantoni ha scritto:
> I tried to disable "default floppy" without use -nodefaults option 
> that disable other things.
> I didn't found other parameters to do that in docs and code for now.
> Can someone tell me if there is another way to disable default floppy 
> only?
>
> About stdvga, I found that memory is configurable from 
> docs/spec/standard-vga:
> >    Framebuffer memory, 16 MB in size (by default).
> >    Size is tunable via vga_mem_mb property.
>
> vga_mem_mb seems wrong in doc, I didn't found it in the code with grep 
> so I tried to use -global vga.vram_size_mb, that (looking at code) 
> seems the correct one.
> By default xen reserve 8 mb of videoram but stdvga default is 16 mb.
> Tried out a domU with Xen, if the memory required from vga is more 
> than memory reserved by xen it should give an error (like qxl and 
> cirrus), but with stdvga I cannot get any error at all.
> I know that in xen there are changes and/or bugfix (probably in 
> hvmloader) to have the emulated vgas full working with qemu upstream 
> but probably stdvga has something to fix and/or improve also on qemu 
> part.
>
> Can someone tell me if memory setting of stdvga is working?
> Is correct to have no errors from xen even if it reserves only 8 mb by 
> default and this size is not setted on qemu with -global?
I tried stdvga on qemu 1.4 with xen and now the default memory of 16 mb 
is effectively working, It seems it was a qemu 1.3 bug.
vga.vram_size_mb still seems to be not working, I don't know if it is a 
qemu problem or just xen (probably about hvmloader, the same problem as 
with qxl).

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