Re: [Xen-devel] MCE in pv-domU

[Juergen Gross <jgross@xxxxxxxx>]

On 07/06/17 16:10, Jan Beulich wrote:
>>>> On 07.06.17 at 16:00, <jgross@xxxxxxxx> wrote:
>> Just saw the message:
>>
>> [    0.005227] mce: CPU supports 2 MCE banks
>>
>> in the boot log of a pv domU (Linux 4.11). I really have problems to see
>> the value of MCE handling being active in this case. Shouldn't we switch
>> it off?
> 
> What's wrong with letting a guest decide on its own what to do
> if a memory page assigned to it went bad? From host perspective
> the only "recovery" would be to kill the guest. The guest kernel,
> otoh, may be able to confine damage to just the killing of a single
> process (or if the page is not in use, no damage would result at
> all).

So the MCE related resources are fully virtualized for the guest?


Juergen


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