From: Andrew Cooper <andrew.cooper3@citrix.com>
Date: Thu, 4 Nov 2021 19:36:23 +0000 (+0000)
Subject: xsm: Use __initconst_cf_clobber for xsm_ops
X-Git-Tag: archive/raspbian/4.17.0-1+rpi1^2~33^2~922
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=7a7b2be4132d3b96833690ccdb637e339aea6d2e;p=xen.git

xsm: Use __initconst_cf_clobber for xsm_ops

All calls through xsm_ops are fully altcall'd.  Harden all function pointer
targets.

This yields:

  (XEN) altcall: Optimised away 197 endbr64 instructions

of 1655 on an everything-enabled build of Xen, which is ~12%.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Daniel P. Smith <dpsmith@apertussolutions.com>
---

diff --git a/xen/xsm/dummy.c b/xen/xsm/dummy.c
index 4d29a9aa5b..8c044ef615 100644
--- a/xen/xsm/dummy.c
+++ b/xen/xsm/dummy.c
@@ -13,7 +13,7 @@
 #define XSM_NO_WRAPPERS
 #include <xsm/dummy.h>
 
-static const struct xsm_ops __initconstrel dummy_ops = {
+static const struct xsm_ops __initconst_cf_clobber dummy_ops = {
     .security_domaininfo           = xsm_security_domaininfo,
     .domain_create                 = xsm_domain_create,
     .getdomaininfo                 = xsm_getdomaininfo,
diff --git a/xen/xsm/flask/hooks.c b/xen/xsm/flask/hooks.c
index 63484e323c..0bf63ffa84 100644
--- a/xen/xsm/flask/hooks.c
+++ b/xen/xsm/flask/hooks.c
@@ -1765,7 +1765,7 @@ static int cf_check flask_argo_send(
 
 #endif
 
-static const struct xsm_ops __initconstrel flask_ops = {
+static const struct xsm_ops __initconst_cf_clobber flask_ops = {
     .security_domaininfo = flask_security_domaininfo,
     .domain_create = flask_domain_create,
     .getdomaininfo = flask_getdomaininfo,
diff --git a/xen/xsm/silo.c b/xen/xsm/silo.c
index 4d5fc98e7e..b89b364287 100644
--- a/xen/xsm/silo.c
+++ b/xen/xsm/silo.c
@@ -102,7 +102,7 @@ static int cf_check silo_argo_send(
 
 #endif
 
-static const struct xsm_ops __initconstrel silo_xsm_ops = {
+static const struct xsm_ops __initconst_cf_clobber silo_xsm_ops = {
     .evtchn_unbound = silo_evtchn_unbound,
     .evtchn_interdomain = silo_evtchn_interdomain,
     .grant_mapref = silo_grant_mapref,