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

[Jan Beulich <jbeulich@xxxxxxxx>]

On 09.10.2019 14:21, Marek Marczykowski-Górecki  wrote:
> On Wed, Oct 09, 2019 at 02:07:05PM +0200, Jan Beulich wrote:
>> On 09.10.2019 13:52, Marek Marczykowski-Górecki  wrote:
>>> I'm talking about Xen->Xen transition here. How system table pointer is
>>> passed from old Xen to new Xen instance? And how the new Xen instance
>>> deals with boot services being not available anymore?
>>
>> It doesn't. I should better have said "* -> Xen transitions" in
>> my earlier reply. I simply can't see how this can all work with
>> EFI underneath without some extra conveying of data from the old
>> to the new instance.
> 
> Does it mean the whole discussion about SetVirtualAddressMap() being
> incompatible with kexec is moot, because runtime services (including
> SetVirtualAddressMap()) are not used by Xen after kexec anyway? If I
> understand correctly, you just said the Xen after kexec don't have
> runtime services pointer.

The concern is about kexec-ing to Linux (based on what I recall
from when I wrote this code; as said the situation may have
changed for modern Linux).

Jan

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