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The purpose of vhost_section is to identify RAM regions that need to be made available to a vhost client. However when running under TCG all RAM sections have DIRTY_MEMORY_CODE set which leads to problems down the line. Re-factor the code so: - steps are clearer to follow - reason for rejection is recorded in the trace point - we allow DIRTY_MEMORY_CODE We expand the comment to explain that kernel based vhost has specific support for migration tracking. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Tested-by: Fabiano Rosas <farosas@linux.ibm.com> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Dr. David Alan Gilbert <dgilbert@redhat.com> Cc: Stefan Hajnoczi <stefanha@redhat.com> Message-Id: <20200605154929.26910-11-alex.bennee@linaro.org>