K 10
svn:author
V 6
emaste
K 8
svn:date
V 27
2018-02-28T14:57:45.393814Z
K 7
svn:log
V 466
Add kernel retpoline option for amd64

Retpoline is a compiler-based mitigation for CVE-2017-5715, also known
as Spectre V2, that protects against speculative execution branch target
injection attacks.

In this commit it is disabled by default, but will be changed in a
followup commit.

Reviewed by:	bdrewery (previous version)
MFC after:	3 days
Security:	CVE-2017-5715
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D14242

END