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Re: [qemu-s390x] [Qemu-devel] [PATCH RFCv2 0/9] qdev: Hotplug handler ch

From: David Hildenbrand
Subject: Re: [qemu-s390x] [Qemu-devel] [PATCH RFCv2 0/9] qdev: Hotplug handler chaining + virtio-pmem
Date: Wed, 6 Feb 2019 14:26:39 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0

On 06.02.19 14:18, Igor Mammedov wrote:
> On Thu, 31 Jan 2019 15:52:25 +0100
> David Hildenbrand <address@hidden> wrote:
>> On 28.01.19 15:18, Igor Mammedov wrote:
>>> On Wed, 23 Jan 2019 20:55:18 +0100
>>> David Hildenbrand <address@hidden> wrote:
>>>> This series implements supprt for hotplug handler chaining (proposed
>>>> by Igor), something that is necessary to turn selected virtio devices into
>>>> memory devices. Planned devices inlude virtio-mem and virtio-pmem. The
>>>> current prototype of virtio-pmem is included.
>>>> The machine hotplug handler can intercept hotplug handler calls
>>>> to properly prepare/teardown the memory device part of a device. Control
>>>> is then passed on to the actual bus hotplug handler. So the default hotplug
>>>> handler is effectively overwritten to make interception possible.
>>>> It is based on the following patches/series
>>>> - [PATCH v1] pc: Use hotplug_handler_(plug|unplug|unplug_request)
>>>> -- Queued by Paolo
>>>> - [PATCH v3 0/2] s390x/pci: hotplug handler fixes and reworks
>>>> Patch 1-3 are the preparations for hotplug handler chaining.
>>> we probably should merge this ones even without pmem patches.
>> Just to verify, does the general approach on how to hotplug virtio based
>> memory devices now looks okay to you?
> it looks fine (minor comments aside)

Thanks a lot for taking your time to look into this Igor, highly

> rant: beside a little bit complex dance with nowadays virtio type names
> but that's not related to your series. It just makes understanding virtio
> code more difficult not saying it's wasn't already complicated to begin with.

Entropy of an isolated system can never decrease over time :D



David / dhildenb

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