On Tue, Mar 22, 2022 at 04:05:15PM +0100, Michal Privoznik wrote:
The prealloc-threads is property of memory-backend class which is
parent to the other three classes memory-backend-{ram,file,memfd}.
Therefore the property is present for all, or none if QEMU is
older than v5.0.0-rc0~75^2~1^2~3 which introduced the property.

Anyway, the .reserve property is the same story, and we chose
memory-backend-file to detect it, so stick with our earlier
decision and use the same backend to detect this new property.

Signed-off-by: Michal Privoznik <mpriv...@redhat.com>

Reviewed-by: Martin Kletzander <mklet...@redhat.com>

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