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Re: [Qemu-devel] [PATCH v3 1/2] s390x/pci: Introduce unplug requests and

From: Cornelia Huck
Subject: Re: [Qemu-devel] [PATCH v3 1/2] s390x/pci: Introduce unplug requests and split unplug handler
Date: Wed, 23 Jan 2019 12:03:37 +0100

On Mon, 21 Jan 2019 14:42:48 +0100
David Hildenbrand <address@hidden> wrote:

> PCI on s390x is really weird and how it was modeled in QEMU might not have
> been the right choice. Anyhow, right now it is the case that:
> - Hotplugging a PCI device will silently create a zPCI device
>   (if none is provided)
> - Hotunplugging a zPCI device will unplug the PCI device (if any)
> - Hotunplugging a PCI device will unplug also the zPCI device
> As far as I can see, we can no longer change this behavior. But we
> should fix it.
> Both device types are handled via a single hotplug handler call. This
> is problematic for various reasons:
> 1. Unplugging via the zPCI device allows to unplug PCI bridges as
>    checks are not performed - bad.

Maybe I'm confused here, but how can a zPCI device couple with a bridge?

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