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Re: [Qemu-discuss] Longer time to detach device in q35

From: Maxim Levitsky
Subject: Re: [Qemu-discuss] Longer time to detach device in q35
Date: Sun, 28 Apr 2019 14:20:44 +0300

I 'think' that this is due to the fact that Q35 uses the PCIe hotplug, which was
done for real life PCIe hotplug which involves operator pressing a button, and
then waiting for confirmation. 

The spec allows the operator to change his mind during 5 second timeout (or
something similiar).

Now what qemu does on hot unplug, is that it presses that button logically, but
then the guest waits the 5 seconds before it acts upon it as written in the

The 'pc' machine either uses acpi or older 'standard pci hotplug controller'
whic might lack this 'feature'

I am adding Michael here, as I remember that he mentioned this once.

Best regards,
        Maxim Levitsky

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