From: Jan Beulich <jbeulich@suse.com>
Date: Fri, 23 Nov 2018 10:54:35 +0000 (+0100)
Subject: VMX: allow migration of guests with SSBD enabled
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=710cc096971019bc2e5a9aabb9af1acca0b5b9e7;p=xen.git

VMX: allow migration of guests with SSBD enabled

The backport of cd53023df9 ("x86/msr: Virtualise MSR_SPEC_CTRL.SSBD for
guests to use") did not mirror the PV side change into the HVM (VMX-
specific) code path.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
---

diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index a9e87b5a9a..82e3c2ceca 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -905,7 +905,8 @@ static int vmx_load_msr(struct vcpu *v, struct hvm_msr *ctxt)
              * ignored) when STIBP isn't enumerated in hardware.
              */
             else if ( ctxt->msr[i].val &
-                      ~(SPEC_CTRL_IBRS | SPEC_CTRL_STIBP) )
+                      ~(SPEC_CTRL_IBRS | SPEC_CTRL_STIBP |
+                        (boot_cpu_has(X86_FEATURE_SSBD) ? SPEC_CTRL_SSBD : 0)) )
                 err = -ENXIO;
             else
                 v->arch.spec_ctrl = ctxt->msr[i].val;