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Re: [PATCH v2 0/3] exclude hyperv synic sections from vhost

From: Paolo Bonzini
Subject: Re: [PATCH v2 0/3] exclude hyperv synic sections from vhost
Date: Mon, 13 Jan 2020 19:13:10 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1

On 13/01/20 18:36, Dr. David Alan Gilbert (git) wrote:
> Hyperv's synic (that we emulate) is a feature that allows the guest
> to place some magic (4k) pages of RAM anywhere it likes in GPA.
> This confuses vhost's RAM section merging when these pages
> land over the top of hugepages.

Can you explain what is the confusion like?  The memory API should just
tell vhost to treat it as three sections (RAM before synIC, synIC
region, RAM after synIC) and it's not clear to me why postcopy breaks


> Since they're not normal RAM, and they shouldn't have vhost DMAing
> into them, exclude them from the vhost set.

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