[Pkg-xen-devel] Bug#810964: [Xen-devel] [BUG] EDAC infomation partially missing

[Elliott Mitchell]

On Tue, May 16, 2017 at 03:54:37AM -0600, Jan Beulich wrote:
> >>> On 16.05.17 at 05:47, <ehem+debian at m5p.com> 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.


-- 
(\___(\___(\______          --=> 8-) EHM <=--          ______/)___/)___/)
 \BS (    |         EHeM+sigmsg at m5p.com  PGP 87145445         |    )   /
  \_CS\   |  _____  -O #include <stddisclaimer.h> O-   _____  |   /  _/
8A19\___\_|_/58D2 7E3D DDF4 7BA6 <-PGP-> 41D1 B375 37D0 8714\_|_/___/5445