Re: [Qemu-devel] [PATCH v5 0/5] Support for S3 ACPI state (suspend to memory) in BIOS

[Gleb Natapov]

On Thu, Nov 27, 2008 at 01:17:16PM +0100, Carl-Daniel Hailfinger wrote:
> Hi,
> 
> On 27.11.2008 12:02, Gleb Natapov wrote:
> > This patch series adds S3 (suspend to RAM) ACPI state to BIOS. Most
> > changes concern themselves with preventing BIOS from using memory
> > locations available to a guest OS.
> >   
> 
> I see the problem you're facing with the overwrite and it looks there
> might be a cleaner solution: If you can lock the CPU cache so that
> writes don't get passed through to RAM, you're free to use any area
> (with a few contraints) for stack without having to worry about
> clobbering memory contents there.
> 
> That method is called Cache-as-RAM and I'm currently trying to implement
> it in Qemu. I haven't looked into Bochs yet, but it should be doable
> there as well.
> 
It would be nice to not worry about stack location. We may try to use it
when you changes will work in Qemu and BOCHS.

--
                        Gleb.