Re: [Qemu-devel] [Issues] PCI hotplug does not work well on pc platform?

[Marcel Apfelbaum]

On 2/14/19 4:15 PM, Igor Mammedov wrote:
> On Thu, 14 Feb 2019 15:12:35 +0200
> Marcel Apfelbaum <address@hidden> wrote:
>
> > Hi Igor, Jing
> >
> > On 2/14/19 1:31 PM, Igor Mammedov wrote:
> > > On Wed, 13 Feb 2019 15:40:57 +0800
> > > "Liu, Jing2" <address@hidden> wrote:
> > >   
> > > > Hi Igor,
> > > >
> > > > Thanks for your reply!
> > > >
> > > > On 2/5/2019 11:47 PM, Igor Mammedov wrote:
> > > > > On Wed, 30 Jan 2019 21:02:10 +0800
> > > > > "Liu, Jing2" <address@hidden> wrote:
> > > > >       
> > > > > > Hi everyone,
> > > > > >
> > > > > > I have two questions.
> > > > > > 1. PCI hotplug on pci.0 must manually rescan in guest. The ACPI hotplug
> > > > > > handler sends the GPE event to guest but it seems guest doesn't receive
> > > > > > it? I tried to open ACPI debug level/layer to 0xffffffff, in order to
> > > > > > see if there is any message after device_add in monitor, but no message
> > > > > > comes out until I manually rescan. Also tried printk in
> > > > > > acpi_ev_gpe_xrupt_handler() and acpi_ev_sci_xrupt_handler(). No output
> > > > > > in dmesg.
> > > > > > (I'm sure that CONFIG_HOTPLUG_PCI_PCIE=y, CONFIG_HOTPLUG_PCI_CPCI=y,
> > > > > > CONFIG_HOTPLUG_PCI=y, CONFIG_HOTPLUG_PCI_ACPI=y)
> > What about |CONFIG_HOTPLUG_PCI_SHPC=y ?
> >
> > |
> > > > > > Whether this is a kind of design or a known issue? Does guest receive
> > > > > > the request, where can I find the
> > > > > does it work with known to work kernels (RHEL7)?
> > > > >
> > > > > Also sharing used QEMU version and command line could help.
> > > > >       
> > > > Is there any key config of kernel in guest, besides those I listed above?
> > > Maybe Marcel knows something about it
> > > (CCed)
> > May I ask why do you need SHPC hotplug and not the ACPI based hotplug?
> I'd say SHPC one is preferred one, ACPI hotplug is rather complicated
> QEMU hack to make legacy Windows guest support hotplug of PCI devices.

I can understand and agree, but is much less tested; anyway I distinctly
remember I fix all the problems with PCI SHPC hotplug, it should work.

Thanks,
Marcel

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