On Mon, 2021-09-20 at 18:25 +0100, Andrew Cooper wrote:
> Four TRC_MEM_* records supply custom structures with tail padding,
> leaking
> stack rubble into the trace buffer.  Three of the records were fine
> in 32-bit
> builds of Xen, due to the relaxed alignment of 64-bit integers, but
> POD_SUPERPAGE_SPLITER was broken right from the outset.
> 
> We could pack the datastructures to remove the padding, but
> xentrace_format
> has no way of rendering the upper half of a 16-bit field.  Instead,
> expand all
> 16-bit fields to 32-bit.
> 
> For POD_SUPERPAGE_SPLINTER, introduce an order field as it is
> relevant
> information, and to match DECREASE_RESERVATION, and so it doesn't
> require a
> __packed attribute to drop tail padding.
> 
> Update xenalyze's structures to match, and introduce xentrace_format
> rendering
> which was absent previously.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
> Reviewed-by: Jan Beulich <jbeulich@suse.com>
>
Reviewed-by: Dario Faggioli <dfaggioli@suse.com>

Thanks and Regards
-- 
Dario Faggioli, Ph.D
http://about.me/dario.faggioli
Virtualization Software Engineer
SUSE Labs, SUSE https://www.suse.com/
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