Re: [Xen-devel] [PATCH] libacpi: report PCI slots as enabled only for hotpluggable devices

[Ian Jackson <ian.jackson@xxxxxxxxxx>]

Jan Beulich writes ("Re: [PATCH] libacpi: report PCI slots as enabled only for 
hotpluggable devices"):
> >>> On 23.05.19 at 17:20, <wei.liu2@xxxxxxxxxx> wrote:
> > On Thu, May 23, 2019 at 02:57:49AM -0600, Jan Beulich wrote:
> >> >>> On 22.05.19 at 20:10, <igor.druzhinin@xxxxxxxxxx> wrote:
> >> > DSDT for qemu-xen lacks _STA method of PCI slot object. If _STA method
> >> > doesn't exist then the slot is assumed to be always present and active
> >> > which in conjunction with _EJ0 method makes every device ejectable for
> >> > an OS even if it's not the case.
> >> > 
> >> > qemu-kvm is able to dynamically add _EJ0 method only to those slots
> >> > that either have hotpluggable devices or free for PCI passthrough.
> >> > As Xen lacks this capability we cannot use their way.
> >> > 
> >> > qemu-xen-traditional DSDT has _STA method which only reports that
> >> > the slot is present if there is a PCI devices hotplugged there.
> >> > This is done through querying of its PCI hotplug controller.
> >> > qemu-xen has similar capability that reports if device is "hotpluggable
> >> > or absent" which we can use to achieve the same result.
> >> > 
> >> > Signed-off-by: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>
> >> 
> >> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
> >> 
> > 
> > Jan, FAOD since you're the maintainer I'm expecting you to push this
> > patch yourself.
> 
> Sure, I have it on my list of things to push.

Is this a backport candidate ?  It sounds like it might be a bugfix
but I don't understand the risks/implications.

Thanks,
Ian.

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