Re: [Xen-devel] [PATCH v3] x86/boot: Make alternative patching NMI-safe

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 06.02.18 at 12:09, <andrew.cooper3@xxxxxxxxxx> wrote:
> During patching, there is a very slim risk that an NMI or MCE interrupt in the
> middle of altering the code in the NMI/MCE paths, in which case bad things
> will happen.
> 
> The NMI risk can be eliminated by running the patching loop in NMI context, at
> which point the CPU will defer further NMIs until patching is complete.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

While I'm not overly happy with this approach, I can live with it,
at least for the time being, so
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>

Jan


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