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Re: [Qemu-devel] [PATCH 3/3] Get system state configuration from QEMU an

From: Gleb Natapov
Subject: Re: [Qemu-devel] [PATCH 3/3] Get system state configuration from QEMU and patch DSDT with it.
Date: Sun, 20 May 2012 15:15:39 +0300

On Sun, May 20, 2012 at 02:44:51PM +0300, Avi Kivity wrote:
> On 05/20/2012 12:03 PM, Gleb Natapov wrote:
> > QEMU may want to disable guest's S3/S4 support and it wants to distinguish
> > between regular powerdown and S4 powerdown. To support that new fw_cfg
> > option was added that passes supported system states and what value should
> > guest use to enter each state. States are passed in 6 byte array. Each
> > byte represents one system state. If byte at offset X has its MSB set
> > it means that system state X is supported and to enter it guest should
> > use the value from lowest 7 bits. Patch also detects old QEMU and uses
> > values that work in backwards compatible way there.
> >
> Do we actually have to patch the DSDT?  Or can _S3 etc be made into
> functions instead? (and talk to the bios, or even to fwcfg directly?)
We better not talk to fwcfg after OSPM is started since this is firmware
confing interface. Regardless, presence of _S3 name or method is all
that needed for OS enabling S3 option. If _S3 is defined as a method it
has to return Package() otherwise iasl refuses to compile it.


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