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Re: [PATCH 0/2] exclude hyperv synic sections from vhost

From: Vitaly Kuznetsov
Subject: Re: [PATCH 0/2] exclude hyperv synic sections from vhost
Date: Wed, 08 Jan 2020 15:26:53 +0100

"Dr. David Alan Gilbert (git)" <address@hidden> writes:

> From: "Dr. David Alan Gilbert" <address@hidden>
> 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.
> Since they're not normal RAM, and they shouldn't have vhost DMAing
> into them, exclude them from the vhost set.
> I do that by marking them as device-ram and then excluding device-ram
> from vhost.
> bz: https://bugzilla.redhat.com/show_bug.cgi?id=1779041

Cc: Roman who's The Synic Overlord to make sure he doesn't miss this.


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