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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> 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).

Jan


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