[xen stable-4.13] x86/spec-ctrl: Honour spec-ctrl=0 for unpriv-mmio sub-option

[patchbot@xxxxxxx]

commit 14c5e0c134228438e56ab956254742aef775b3dd
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Fri Jul 8 16:11:40 2022 +0100
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Tue Jul 12 16:33:19 2022 +0100

    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@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
    (cherry picked from commit 4cdb519d797c19ebb8fadc5938cdb47479d5a21b)
---
 xen/arch/x86/spec_ctrl.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/arch/x86/spec_ctrl.c b/xen/arch/x86/spec_ctrl.c
index d4ba941206..3b34ca705c 100644
--- 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;
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.13