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Re: [Qemu-devel] [RFC PATCH 0/3] Balloon inhibit enhancements

From: Michael S. Tsirkin
Subject: Re: [Qemu-devel] [RFC PATCH 0/3] Balloon inhibit enhancements
Date: Mon, 30 Jul 2018 17:51:28 +0300

On Mon, Jul 30, 2018 at 08:39:39AM -0600, Alex Williamson wrote:
> This is more
> compatible with the IOMMU mappings,

Precisely. These are at page granularity.

> but I don't think it can be done
> atomically with respect to inflight DMA of a physical device where we
> cannot halt the device without interfering with its state.

Guests never add pages to the balloon if they are under DMA,
so that's fine - there's never an in-flight DMA, if
there is guest is buggy and it's ok to crash it.


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