Revert "x86/kvm: Set IBPB when switching VM"

CVE-2017-5753 (revert embargoed)
CVE-2017-5715 (revert embargoed)

This reverts commit 30907f82.
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

arch/x86/kvm/vmx.c

@@ -1336,7 +1336,6 @@ static void vmcs_load(struct vmcs *vmcs)
 	if (error)
 		printk(KERN_ERR "kvm: vmptrld %p/%llx failed\n",
 		       vmcs, phys_addr);
-
 }
 
 #ifdef CONFIG_KEXEC_CORE
@@ -2050,8 +2049,6 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 	if (per_cpu(current_vmcs, cpu) != vmx->loaded_vmcs->vmcs) {
 		per_cpu(current_vmcs, cpu) = vmx->loaded_vmcs->vmcs;
 		vmcs_load(vmx->loaded_vmcs->vmcs);
-		if (boot_cpu_has(X86_FEATURE_SPEC_CTRL))
-			native_wrmsrl(MSR_IA32_PRED_CMD, FEATURE_SET_IBPB);
 	}
 
 	if (vmx->loaded_vmcs->cpu != cpu) {