x86/spec-ctrl: Honour spec-ctrl=0 for unpriv-mmio sub-option

This was an oversight from when unpriv-mmio was introduced.

Fixes: 8c24b70fedcb ("x86/spec-ctrl: Add spec-ctrl=unpriv-mmio")
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
(cherry picked from commit 4cdb519d797c19ebb8fadc5938cdb47479d5a21b)

diff --git a/xen/arch/x86/spec_ctrl.c b/xen/arch/x86/spec_ctrl.c
index 83b856fa9158955b3b1fe81dffb7f0c554f479de..58a2797dfea13da39ca7fa806c419f5ef6712fa1 100644 (file)
--- a/xen/arch/x86/spec_ctrl.c
+++ b/xen/arch/x86/spec_ctrl.c
@@ -118,6 +118,7 @@ static int __init parse_spec_ctrl(const char *s)
             opt_l1d_flush = 0;
             opt_branch_harden = false;
             opt_srb_lock = 0;
+            opt_unpriv_mmio = false;
         }
         else if ( val > 0 )
             rc = -EINVAL;