RE: [Xen-devel] RE: Question about Xen S3 and resume code - Linux dom0 never exits the xen_safe_halt hypercall after resume

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@xxxxxxxxxx]
> Sent: Friday, July 01, 2011 12:31 AM
> 
> On Thu, Jun 30, 2011 at 01:34:27PM +0800, Tian, Kevin wrote:
> > Hi, Konrad,
> >
> > any update on this S3 problem you're seeing?
> 
> I removed the i915, the USB, and didn't have any WARN or such in the
> bootup. But it still would not get back to the Linux dom0 after a resume.
> 
> (http://darnok.org/xen/devel-acpi-s1-no-i915-no-usb.log)

S3 is a very fragile feature which highly depends on the platform 
implementation.
I'd more think there's a driver related resume issue which is incompatible with
Xen in the resume path. I can't tell why w/ ACPI processor driver it can forward
progress... perhaps due to more timer activity e.g. from cpufreq timer which
kicks some hanging point...

> 
> >
> > I just got a chance to give a try on my Dell core-i7 platform with a Ubuntu
> 10.10
> > system.
> >
> > Xen version is:
> > changeset:   23632:33717472f37e
> > tag:         tip
> > user:        Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> > date:        Tue Jun 28 18:15:44 2011 +0100
> > summary:     libxc: Squash xc_e820.h (and delete) into xenctrl.h
> >
> > for dom0 I use origin/master plus ACPI patches queued on your
> origin/devel/acpi-s3.v0:
> 
> <nods> OK, so the working branch.
> 
> > commit 4aa69dc48e031276b4d771dcb227d553fd3def0b
> > Merge: df5b2b6 9f90a3b
> > Author: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> > Date:   Tue Jun 21 09:34:31 2011 -0400
> >
> >     Merge branch '3.0-rc1-rem_pg_reserve-4' of
> git://xenbits.xen.org/people/sstabellini/linux-pvhvm
> >
> > w/ or w/o ACPI processor patches on my box ACPI S3 just works well.
> 
> And without the ACPI proccessor. What 'Dell Core i7' box is this? Let me try 
> to
> get the
> OptiPlex 780 I've here and see how it fares. Did you use any fancy patches for
> the AMT?

Have to say I lose the actual name for this box. It's a "studio xps" model, with
cpu as "core i7 870 (2.93G)"

there's no AMT related BIOS option on this box, and thus I don't use any other
patches aside. :-)

Thanks
Kevin

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