Re: [PATCH 01/16] x86/traps: Drop last_extable_addr

[Jan Beulich <jbeulich@xxxxxxxx>]

On 02.05.2020 00:58, Andrew Cooper wrote:
> The only user of this facility is dom_crash_sync_extable() by passing 0 into
> asm_domain_crash_synchronous().  The common error cases are already covered
> with show_page_walk(), leaving only %ss/%fs selector/segment errors in the
> compat case.
> 
> Point at dom_crash_sync_extable in the error message, which is about as good
> as the error hints from other users of asm_domain_crash_synchronous(), and
> drop last_extable_addr.

While I'm not entirely opposed, I'd like you to clarify that you indeed
mean to (mostly) revert your own improvement from 6 or 7 years back
(commit 8e0da8c07f4f). I'm also surprised to find this as part of the
series it's in - in what way does this logic get in the way of CET-SS?

Jan