Re: [Qemu-devel] [PATCH 3/3] Get system state configuration from QEMU and patch DSDT with it.

[Gleb Natapov]

On Sun, May 20, 2012 at 12:39:13PM -0400, Kevin O'Connor wrote:
> On Sun, May 20, 2012 at 07:25:40PM +0300, Avi Kivity wrote:
> > On 05/20/2012 07:16 PM, Kevin O'Connor wrote:
> > > > Here we in agreement, and I was against patching till it was 
> > > > unavoidable,
> > > > but than pci hotplug started using it, and afterwards processor
> > > > definitions, so no point in avoiding it now by using inferior methods.
> > >
> > > I agree as well.
> > >
> > > What's the background to needing to have dynamic S3/S4 definitions?
> > > (Why will some qemu instances be able to sleep and not others?)
> > >
> > 
> > Backwards compatibility.  qemu has a -M machine-type option that expose
> > an old qemu's guest-visible attributes.  If an old qemu didn't support
> > S3, then -M old shouldn't either.
> 
> The DSDT has claimed S3, S4, and S5 support since SeaBIOS has
> supported ACPI.  What's the background to the requirement to stop
> claiming support for it?
> 
Not all guests have working S3/S4 implementation. We want management to
be able to disable S3/S4 for such guests. S4 value changes since we want
to distinguish between S4 and S5 in qemu.

--
                        Gleb.