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

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

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.


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