Paolo Bonzini wrote:
> On 11/25/2009 04:00 PM, Jiang, Yunhong wrote:
>> So with your patch, even if host has no ECC support, you will still
>> tell guest that the memory has ECC?
>
> Yes, but I don't think it's of great importance. I'm just pleasing a
> test with the simplest possible 1-line fix. Do you know of anything
> that actually cares (i.e. not just "shows it to the user") about that
> particular DMI field, and does something different if it reads "ECC"?
One possible situation is, considering a host without ECC. When the host
detected 1 bit memory error, it may raises #MCE. If we try to inject this #MCE
to guest, guest will be confused, since DMI have report ECC support already.
Of course, I don't know if any host system will raise #MCE for such error, so
it's more about a feeling that present guest with more capability than what
host can provide is something tricky.
>
> For that matter, hvmloader is already saying that the host is
> running at
> some number of megahertz, which does not make sense for virtualization
> because the host may be loaded and slow down the guest.
Yes, but timer virtualization (especially the TSC virtualization) has taken a
lot of effort on this so that it make sense to guest, although sometime is
relaxed with different timer mode.
--jyh
>
> Paolo
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