Re: [PATCH] acpi: pcihp: make pending delete expire in 5sec

[Michael S. Tsirkin]

On Wed, Apr 05, 2023 at 02:03:32PM +0200, Igor Mammedov wrote:
> On Wed, 5 Apr 2023 05:59:06 -0400
> "Michael S. Tsirkin" <mst@redhat.com> wrote:
> 
> > On Wed, Apr 05, 2023 at 11:24:16AM +0200, Igor Mammedov wrote:
> > > > > PS:
> > > > > See commit message, Windows is not affected as it doesn't
> > > > > clear GPE status bits during ACPI initialization
> > > > > (at least the one version I've tested with, and I won't bet
> > > > > on this with other versions or staying this way)    
> > > > 
> > > > So I am saying linux should match windows. Clearing GPE
> > > > is a bad idea as you then miss events.  
> > > 
> > > I'd say it depends on if guest OS is able to handle hot[un]plug
> > > at boot time when it enables GPE handlers (or any other time).
> > > (My point of view here, it's a guest OS policy and management
> > > layer should know what installed guest is capable of and what
> > > quirks to use with it)
> > > 
> > > I'll try to send a kernel patch to remove GPEx.status clearing,
> > > though it might be more complex than it seems,
> > > hence I'm quite sceptical about it.  
> > 
> > In the world of ACPI, windows is basically the gold standard,
> > whatever it does linux has to do ;)
> I'd say other way around (with their limited acpi interpreter,
> it's getting better though),
> While linux basically is acpica reference code.

For a spec compliant acpi like ours maybe but on real hardware
it is like this because BIOS vendors test their ACPI with windows only.

-- 
MST