On Wed, Sep 12, 2007 at 12:20:23PM -0600, Alex Williamson wrote:
> On Wed, 2007-09-12 at 17:08 +0900, Simon Horman wrote:
> > The following series is the Xen patches that comprise
> > the lastest release of kexec for ia64 Xen. Patches
> > for Linux-Xen, Linux and kexec-tools are posted separately.
> >
> > All the patches and some documentation on building
> > and running kexec can be found at:
>
> Hi Simon,
>
> Thanks for your continued work on kexec. I share Tristan's concern
> of mapping EFI into an HVM guest accessible space. If we can prove that
> can't happen or can find a way to prevent it, I'm reasonable happy with
> this series (a few comments to follow separately). If we can't get the
> EFI mapping resolved right away, lets figure out what patches are
> independent of that so you don't have to continue to manage all of these
> out of the tree. Thanks,
Hi Alex,
thanks so much to you and others for your comments. I'll work my
way through them and comment on each in turn.
With regards to the EFI mapping problem, I think that it is fair to
say that this is the most difficult problem facing the code. I am of
the opinion that the current solution is the best one available.
The previous solution was to not map EFI and always make SAL
calls in physical mode. But this is problematic for a number of reasons
including:
- I'm not sure that it'll work on SN because it allows kernel-supplied
EFI routines - I haven't worked through the details of this.
- Its a pain to configure. If you think you may ever want to Kexec or
Kdump from Xen to Linux or Linux to Xen then you need to turn
the phys_efi option on. Else its optional.
That said, while I think that the current approach is the best
one so far, I'm not entirely convinced that there isn't a better idea.
If people could scratch their heads a bit, that would be great.
Lastly, on a slightly more personal note, I'm going to be travelling
quite a bit over the next month, which may affect my email
responsiveness. Apologies in advance for any bother this may cause.
--
Horms
H: http://www.vergenet.net/~horms/
W: http://www.valinux.co.jp/en/
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