x86, KVM: remove unnecessary argument to x86_virt_spec_ctrl and callers

x86_virt_spec_ctrl only deals with the paravirtualized
MSR_IA32_VIRT_SPEC_CTRL now and does not handle MSR_IA32_SPEC_CTRL
anymore; remove the corresponding, unused argument.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/include/asm/spec-ctrl.h

@@ -13,7 +13,7 @@
  * Takes the guest view of SPEC_CTRL MSR as a parameter and also
  * the guest's version of VIRT_SPEC_CTRL, if emulated.
  */
-extern void x86_virt_spec_ctrl(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl, bool guest);
+extern void x86_virt_spec_ctrl(u64 guest_virt_spec_ctrl, bool guest);
 
 /**
  * x86_spec_ctrl_set_guest - Set speculation control registers for the guest
@@ -24,9 +24,9 @@ extern void x86_virt_spec_ctrl(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl, bo
  * Avoids writing to the MSR if the content/bits are the same
  */
 static inline
-void x86_spec_ctrl_set_guest(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl)
+void x86_spec_ctrl_set_guest(u64 guest_virt_spec_ctrl)
 {
-	x86_virt_spec_ctrl(guest_spec_ctrl, guest_virt_spec_ctrl, true);
+	x86_virt_spec_ctrl(guest_virt_spec_ctrl, true);
 }
 
 /**
@@ -38,9 +38,9 @@ void x86_spec_ctrl_set_guest(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl)
  * Avoids writing to the MSR if the content/bits are the same
  */
 static inline
-void x86_spec_ctrl_restore_host(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl)
+void x86_spec_ctrl_restore_host(u64 guest_virt_spec_ctrl)
 {
-	x86_virt_spec_ctrl(guest_spec_ctrl, guest_virt_spec_ctrl, false);
+	x86_virt_spec_ctrl(guest_virt_spec_ctrl, false);
 }
 
 /* AMD specific Speculative Store Bypass MSR data */

arch/x86/kernel/cpu/bugs.c

@@ -200,7 +200,7 @@ void __init check_bugs(void)
  * MSR_IA32_SPEC_CTRL for SSBD.
  */
 void
-x86_virt_spec_ctrl(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl, bool setguest)
+x86_virt_spec_ctrl(u64 guest_virt_spec_ctrl, bool setguest)
 {
 	u64 guestval, hostval;
 	struct thread_info *ti = current_thread_info();

arch/x86/kvm/svm/svm.c

@@ -3984,7 +3984,7 @@ static __no_kcsan fastpath_t svm_vcpu_run(struct kvm_vcpu *vcpu)
 	 * being speculatively taken.
 	 */
 	if (!static_cpu_has(X86_FEATURE_V_SPEC_CTRL))
-		x86_spec_ctrl_set_guest(svm->spec_ctrl, svm->virt_spec_ctrl);
+		x86_spec_ctrl_set_guest(svm->virt_spec_ctrl);
 
 	svm_vcpu_enter_exit(vcpu, spec_ctrl_intercepted);
 
@@ -3992,7 +3992,7 @@ static __no_kcsan fastpath_t svm_vcpu_run(struct kvm_vcpu *vcpu)
 		reload_tss(vcpu);
 
 	if (!static_cpu_has(X86_FEATURE_V_SPEC_CTRL))
-		x86_spec_ctrl_restore_host(svm->spec_ctrl, svm->virt_spec_ctrl);
+		x86_spec_ctrl_restore_host(svm->virt_spec_ctrl);
 
 	if (!sev_es_guest(vcpu->kvm)) {
 		vcpu->arch.cr2 = svm->vmcb->save.cr2;