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

[Liu, Jing2]

Hi Marcel and Igor,

Thanks very much for your help!

On 2/14/2019 10:42 PM, Marcel Apfelbaum wrote:
>
[...]
> > > > > > > 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 ?

Thanks and I finally found it is because I set hardware reduced acpi 
before and now it is correct.

> > > |
> > > > > > > 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?
Oh, it is some customer's requests. And the method to set PIIX4_PM 
property works.


Thanks!
Jing