Re: [Xen-devel] [PATCH 00/18] xen/arm64: Suspend to RAM support for Xen

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Mon, 12 Nov 2018, Julien Grall wrote:
> Hi Mirela,
> 
> Thank you for posting the series. Could you provide a branch with the patch
> applied?
> 
> On 11/12/18 11:30 AM, Mirela Simonovic wrote:
> > 
> > --------------------------------------------------------------------------------
> > The series does not include:
> > a) UART driver-specific suspend/resume that gets called when console
> > suspends
> 
> I feel it will be difficult to test this series without UART driver support.
> Would it be possible to integrate them in that series?

Actually, you can test this series simply using upstream Linux and
upstream Xen + this series. You can use echo mem > /sys/power/state in
dom0 to go into suspend, and for example setup an RTC wakeup event to
wakeup after a certain amount of time. For instance echo +30 >
/sys/class/rtc/rtc0/wakealarm.

For the Xilinx MPSoC, Linux 4.19 works fine with defconfig. Linux 4.20
(current master) gained EEMI support, but I tested it and it seems to
suspend successfully even if Xen doesn't know how to handle the EEMI
calls that Linux makes when suspending. 

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