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

[Stanislav]

In Bochs CPU doesn't have a cache memory emulated to use it as RAM but it is
still possible to emulate cache-as-ram mode.
The problem that cache-as-ram mode is very very very processor specific and
implementation of it might be different between Intel and AMD for example.
Which one to pick up ?
Or might be better to invent some other mode especially for emulation
reasons ?

Stanislav

-----Original Message-----
From: Gleb Natapov [mailto:address@hidden 
Sent: Thursday, November 27, 2008 2:36 PM
To: address@hidden
Cc: address@hidden
Subject: Re: [Bochs-developers] [Qemu-devel] [PATCH v5 0/5] Support for S3
ACPI state (suspend to memory) in BIOS

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.

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