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

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 04/05/2020 13:44, Jan Beulich wrote:
> 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?

It was part of the exception_fixup() cleanup.  The first 4 patches not
specifically related to CET-SS.

~Andrew