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Re: [Qemu-devel] [PATCH v2 23/25] console: make screendump async

From: Gerd Hoffmann
Subject: Re: [Qemu-devel] [PATCH v2 23/25] console: make screendump async
Date: Mon, 23 Jan 2017 13:04:28 +0100

> If you only ref, you could have the image being modified while it is
> being saved asynchronously, this could result in tearing artefacts,
> no?

Yes, but you have that problem _anyway_.  screendump qmp command can run
in parallel to guest vcpu, so it can race with guest display updates
today.  Assuming they happen as simple framebuffer writes and therefore
don't involve vmexit + grabbing big qemu lock.


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