Re: [Xen-devel] [PATCH] x86: machine check exception handling

[Keir Fraser <keir@xxxxxxxxxxxxx>]

On 21/6/07 15:38, "Christoph Egger" <Christoph.Egger@xxxxxxx> wrote:

> That's not possible. The #MC handler and the polling handler (in non-fatal.c)
> (are going to) do something completely different than any OS will ever do.
> See the discussion with the subject "MCA/MCE concept" for more information.

Well, then I guess these files will change wholesale when this new MCE
architecture is ready. That's fine.

> In opposition to the polling handler, #MC interruption is *very* bad.
> A #MC always means, that an uncorrectable ECC error is detected
> by the hw. First you have to figure out, who is impacted: Is it Xen, Dom0 or
> DomU?
> In case of Xen and Dom0 you can only do something using hw correction
> features or crash. In case of DomU, you can kill DomU in the worst case
> and keep the rest running.

If the error is such that it will impact correct execution of a Xen
interrupt handler (which generally do very little indeed) then you are
boned. Your #MC handler is unlikely to work properly either. Game over.

And you already know my opinion of the new "MCA/MCE concept".

 -- Keir


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