Re: [Xen-devel] Likely regression in efi=no-rs option

[Roman Shaposhnik <roman@xxxxxxxxxx>]

Ok, to sum up -- there's definitely a pretty major regression on all
this hardware with Xen 4.13 RC2:
     
https://www.dell.com/en-us/work/shop/gateways-embedded-computing/sc/gateways-embedded-pcs/edge-gateway?~ck=bt

Without efi=no-rs option Xen panics on boot (sorry for attaching the
screenshot -- I know it is not super helpful but it gets the point
across)

With efi=no-rs Xen boots fine, but Dom0 can't come up.

And, once again, this is clearly a regression from RC1 (just verified).

Thanks,
Roman.

On Sat, Nov 16, 2019 at 12:47 PM Rich Persaud <persaur@xxxxxxxxx> wrote:
>
> I don't know if there's a change in efi=no-rs behavior, but some EFI fixes 
> were merged on 10/25, which (on some machines) have reduced the need to 
> disable UEFI runtime services to work around non-spec UEFI firmware.  This 
> should increase hardware compatibility with Xen.  Of course, there could 
> still be other reasons to disable UEFI runtime services.
>
> Could you try booting the affected systems with efi=rs?
>
> Rich
>
> > On Nov 16, 2019, at 00:27, Roman Shaposhnik <roman@xxxxxxxxxx> wrote:
> >
> > Hi!
> >
> > as I've reported earlier -- part of my testing of Xen 4.13 RC2 failed
> > in a massive way with Dom0 never coming up. I've traced that problem
> > to the option that we're using to boot Xen:
> >    efi=no-rs
> > We've been using this option for quite sometime and Xen 4.13 RC2
> > is the first one that seems to make Dom0 boot fail with this option
> > present (note that RC1 was fine).
> >
> > I was wondering whether there were any changes in the areas related
> > to UEFI in Xen that may have triggered this.
> >
> > Here's the boot line that works with RC2:
> >    dom0_mem=1024M,max:1024M dom0_max_vcpus=1 dom0_vcpus_pin smt=false
> > adding efi=no-rs make Dom0 boot process fail:
> >    efi=no-rs dom0_mem=1024M,max:1024M dom0_max_vcpus=1 dom0_vcpus_pin 
> > smt=false
> >
> > Attaching xl info and dmesg just in case
> >
> > Thanks,
> > Roman.
> > <dmesg.txt>
> > <info.txt>
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxxx
> > https://lists.xenproject.org/mailman/listinfo/xen-devel

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