Re: [Xen-devel] Xen 4.12 panic on Thinkpad W540 with UEFI mutiboot2, efi=no-rs workarounds it

[Jan Beulich <jbeulich@xxxxxxxx>]

On 07.08.2019 17:51, Marek Marczykowski-Górecki  wrote:
> On Wed, Aug 07, 2019 at 05:33:05PM +0200, Jan Beulich wrote:
> > On 07.08.2019 17:17, Marek Marczykowski-Górecki  wrote:
> > > Actually, I've already tried, but every other build I try, I get even
> > > less useful call trace, for example debug unstable build:
> > >
> > >       Xen call trace:
> > >          [<000000007b751c09>] 000000007b751c09
> > >          [<8c2b0398e0000daa>] 8c2b0398e0000daa
> > > ...
> > >       GENERAL PROTECTION FAULT
> > >       [error_code=0000]
> > But this makes reasonable sense: The faulting insn is "call *0x18(%rax)"
> > and %rax is 6954b2b0, which points into a block of type
> > EfiBootServicesData (and hence likely reused by the time of the crash
> > for other purposes). Hence the "/mapbs" option of xen.efi might help
> > here too, but iirc there's no equivalent for it in the MB2 case.
> Oh, yes, indeed in Qubes we have /mapbs enabled by default with xen.efi.
> I'd like to add it to MB2 case too. Is command line parsed at this point
> (efi_exit_boot()) already?
I'm struggling a little how to reply, considering that I've already
said "iirc there's no equivalent for it in the MB2 case". So I guess
I'm simply not understanding your question, or more specifically
where you want to get with it.

Jan

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