Re: [Xen-devel] fyi, Xen's EFI workarounds (/mapbs & efi=no-rs) on SuperMicro hardware; fixes solve 1/2 problems & SM responds that can't/won't fix their firmware

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Mon, Dec 07, 2015 at 09:20:12AM -0500, Konrad Rzeszutek Wilk wrote:
> On Sat, Dec 05, 2015 at 12:54:56PM -0800, PGNet Dev wrote:
> > On 12/05/2015 11:44 AM, Konrad Rzeszutek Wilk wrote:
> > >>Two issues exist with the SuperMicro EFI
> > >>
> > >>  (1) firmware EFI mis-mapping causing Xen PANIC on restart
> > >
> > >Can you try 'reboot=acpi' ?
> > >
> > ...
> > >>I.e., what combination of
> > >>
> > >>/mapbs
> > >>efi=no-rs
> > >>reboot=acpi
> > >>
> > >All? It should be on the Xen command line.
> > 
> > with /mapbs on the EFI exec line,
> > 
> >     grep mapbs /boot/grub2/grub.cfg
> >             chainloader $cmdpath/xen-4.6.0_04-398.efi xen-4.6.0_04-398.efi 
> > config.1
> > /mapbs
> > 
> > and on the Xen Cmd Line,
> > 
> >     grep efi= /boot/efi/EFI/opensuse/xen-4.6.0_04-398.cfg
> >             options= dom0_mem=3072M,max:3072M ... loglvl=all 
> > guest_loglvl=all
> > efi=no-rs reboot=acpi
> 
> > 
> > not clear to me what effect, if any, the addition of 'reboot=acpi' and
> > '/mapbs' has, relative to just 'efi=no-rs' has.
> 
> 
> Are you by chance an lawyer? :-)
> 
> Try without /mapbs, efi=nr-rs and with reboot=acpi. That should use EFI 
> routines
> for everything (including reboot). Doing the 'reboot=acpi' will override
> the reboot routine to only use the ACPI method.
> 
> Granted if you did 'efi=nr-rs' we bypass EFI altogether and use 'acpi' method.
> 
> My theory was that if use some EFI routines it inits the firmware enough
> that ACPI reboot should work. But it may be that it is just not happy.
> 
> There is an extra patch you can try to determine if the failure is
> due to us doing ExitBootServices and not using virtual addresses (which
> for example is the reason that under Lenovo it goes haywire).
> 
> See attached patch (against staging). With that you would do:

Now attached.
> 
> xen.efi /noexitboot /mapbs
> 
> And you can try without 'efi=no-rs'.
> 
> However I am wondering - why are you using '/mapbs' ? What did it
> help? (The combination of 'efi=no-rs' means you are in effect not
> using _any_ EFI operations - so doing /mapbs is not needed).

Attachment: 0001-EFI-early-Implement-GetNextVariableName-and-query-an.patch
Description: Text document

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