Re: [Xen-devel] [BUG] EDAC infomation partially missing

[Elliott Mitchell <ehem+debian@xxxxxxx>]

On Tue, May 16, 2017 at 03:54:37AM -0600, Jan Beulich wrote:
> >>> On 16.05.17 at 05:47, <ehem+debian@xxxxxxx> wrote:
> >  I suspect the only paravirtualization needed is to
> > map the physical address of the soft|hard errors to which VM's memory
> > range was effected.  What this effects is which VM should panic in case
> > of hard errors.
> 
> Which in turn obviously requires hypervisor interaction. It's not really
> clear to me whether perhaps the driver would better live in the
> hypervisor in the first place for that reason.
> 
> And there's a second piece of paravirtualization needed: The driver
> doesn't distinguish physical and machine address spaces, yet the
> addresses reported by hardware are machine ones and hence would
> generally need translation to physical ones in order to assign Dom0-
> local meaning to them (or to determine that the address belongs to
> another VM or the hypervisor).

Merely reporting the machine address to Dom0 is already high value since
it lets you attribute the failure to a memory module.  Without that you
may have a VM or whole machine randomly crash for a completely unknown
reason.


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