Re: [Xen-devel] [PATCH 4/5] x86/alternative: Implement NMI/#MC-safe patching

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 31/01/18 06:07, Juergen Gross wrote:
> On 30/01/18 20:26, Andrew Cooper wrote:
>> However, there is literally nothing we can do to prevent #MC from
>> arriving.  We can stop servicing #MC by disabling CR4.MCE, but then the
>> processor will shut down.
> Hmm, there is a way to avoid #MC on other processors, but this
> requires the really big hammer: stop all other cpus and restart
> them after patching.

I think that firmly goes on the pile of "worse than doing nothing" :)

Also, it doesn't solve the problem of #MC arriving on the current processor.

~Andrew

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