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Re: [PATCH 2/3] xen/sched: fix theoretical races accessing vcpu->dirty_cpu

On 30.04.20 17:15, Juergen Gross wrote:
The dirty_cpu field of struct vcpu denotes which cpu still holds data
of a vcpu. All accesses to this field should be atomic in case the
vcpu could just be running, as it is accessed without any lock held
in most cases.

There are some instances where accesses are not atomically done, and
even worse where multiple accesses are done when a single one would
be mandated.

Correct that in order to avoid potential problems.

Add some assertions to verify dirty_cpu is handled properly.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>

Please ignore this one, just realized it doesn't build for ARM.




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