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Re: [RFC PATCH 0/1] Removing RAMBlocks during migration

From: Michael S. Tsirkin
Subject: Re: [RFC PATCH 0/1] Removing RAMBlocks during migration
Date: Tue, 7 Jan 2020 15:02:10 -0500

On Mon, Dec 09, 2019 at 10:41:01AM +0300, Yury Kotov wrote:
> Hi,
> I found that it's possible to remove a RAMBlock during migration.
> E.g. device hot-unplugging initiated by a guest (how to reproduce is below).
> And I want to clarify whether RAMBlock removing (or even adding) during
> migration is valid operation or it's a bug.

There's a very basic problem though: list of RAMBlock's on source and
destination must match otherwise destination will be confused.

It is probably fixable: keep a fake RAMBlock around until migration is
complete, and send some kind of "RAMBlock removed" message to
destination so it knows to remove it there as well.


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