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

From: Liu, Jing2
Subject: Re: [Qemu-devel] [Issues] PCI hotplug does not work well on pc platform?
Date: Mon, 18 Feb 2019 12:24:02 +0800
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.5.0

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.

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
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.


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