Re: [Xen-ia64-devel] [RFC] MCA handler support for Xen/ia64

[Masaki Kanno <kanno.masaki@xxxxxxxxxxxxxx>]

Hi Alex,

Thanks for your comments.
We noticed there were problems by your comments, 
and they must be solved. Please give us a few days 
for thinking.

Best regards,
 Kan

>Hi Masaki,
>
>   Thanks for the write-up, generally looks like a good approach to me.
>A few comments and questions:
>
>   How do you plan to handle the mismatch between dom0's vCPUs and the
>pCPUs reporting errors.  For instance, will all pCPU's CMCs be injected
>into dom0 vCPU0?  Will all CPE records be returned from all pCPUs when
>dom0 does a SAL_GET_STATE_INFO from vCPU0?  SAL_GET_STATE_INFO_SIZE may
>need to return the platform state info size * number of pCPUs to allow
>dom0 enough space to save the records.  On big SMP systems we need to
>make sure that's not more than can reasonable be allocated in the kernel
>by dom0.
>
>   What about clearing error records?  We need to be careful that error
>records read by Xen and cleared before being passed to dom0 are volatile
>and could be lost if the system crashes or if dom0 doesn't retrieve
>them.  It's best to only clear the log after the error record has been
>received by dom0 and dom0 issues a SAL_CLEAR_STATE_INFO.  This will get
>complicated if we need to clear error records on all pCPUs in response
>to a SAL_CLEAR_STATE_INFO on dom0 vCPU0.
>
>   Do you plan to support CMC and CPE throttling in Xen (ie. switching
>between interrupt driven and polling handlers under load) and dynamic
>polling intervals?
>
>   It may be overly complicated to support CPEI on dom0 (fake MADT
>entries, trapping IOSAPIC write, maybe an entirely virtual IOSAPIC in
>order to describe a valid GSI for the CPEI, etc...).  Probably best to
>start out with just letting dom0 poll for CPE records.  Thanks,
>
>       Alex
>
>-- 
>Alex Williamson                             HP Open Source & Linux Org.



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