Re: [Qemu-block] null-co undefined read behavior

[Stefan Hajnoczi]

On Mon, Jun 12, 2017 at 05:20:55PM -0400, John Snow wrote:
> (3) Edit any tests to always use the zero option when using the null
> driver, and then periodically keep updating this option in a losing
> battle over time.

read-zeroes=on would have been a nicer default value because changing it
could cause problems.

We can do the following:

Print a warning when null-* is instantiated with read-zeroes=off.  This
will alert humans and it will make the missing option obvious in test
output (hopefully we don't filter the warning out!).

Stefan

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