Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?

[Gleb Natapov]

On Wed, Aug 04, 2010 at 08:04:09AM -0500, Anthony Liguori wrote:
> On 08/04/2010 03:17 AM, Avi Kivity wrote:
> >For playing games, there are three options:
> >- existing fwcfg
> >- fwcfg+dma
> >- put roms in 4GB-2MB (or whatever we decide the flash size is)
> >and have the BIOS copy them
> >
> >Existing fwcfg is the least amount of work and probably
> >satisfactory for isapc.  fwcfg+dma is IMO going off a tangent.
> >High memory flash is the most hardware-like solution, pretty easy
> >from a qemu point of view but requires more work.
> 
> The only trouble I see is that high memory isn't always available.
> If it's a 32-bit PC and you've exhausted RAM space, then you're only
> left with the PCI hole and it's not clear to me if you can really
> pull out 100mb of space there as an option ROM without breaking
> something.
> 
We can map it on demand. Guest tells qemu to map rom "A" to address X by
writing into some io port. Guest copies rom. Guest tells qemu to unmap
it. Better then DMA interface IMHO.

--
                        Gleb.