x86/HVM: drop vector parameter from .pi_update_irte() hook

It's redundant with the struct pirq * being passed, and the vector field
in struct msi_desc wanting to be cleared can be derived from v (and hence
pi_desc) being NULL.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Roger Pau Monné <roger@xenproject.org>

xen/arch/x86/hvm/vmx/vmx.c

@@ -395,7 +395,7 @@ void vmx_pi_hooks_deassign(struct domain *d)
  * when guest changes MSI/MSI-X information.
  */
 static int cf_check vmx_pi_update_irte(const struct vcpu *v,
-                                       const struct pirq *pirq, uint8_t gvec)
+                                       const struct pirq *pirq)
 {
     const struct pi_desc *pi_desc = v ? &v->arch.hvm.vmx.pi_desc : NULL;
     struct irq_desc *desc;
@@ -414,7 +414,7 @@ static int cf_check vmx_pi_update_irte(const struct vcpu *v,
         goto unlock_out;
     }
     msi_desc->pi_desc = pi_desc;
-    msi_desc->gvec = gvec;
+    msi_desc->gvec = pi_desc ? pirq_dpci(pirq)->gmsi.gvec : 0;
     msg = msi_desc->msg;
 
     spin_unlock_irq(&desc->lock);

xen/arch/x86/include/asm/hvm/hvm.h

@@ -220,8 +220,7 @@ struct hvm_function_table {
     void (*sync_pir_to_irr)(struct vcpu *v);
     bool (*test_pir)(const struct vcpu *v, uint8_t vector);
     void (*handle_eoi)(uint8_t vector, int isr);
-    int (*pi_update_irte)(const struct vcpu *v, const struct pirq *pirq,
-                          uint8_t gvec);
+    int (*pi_update_irte)(const struct vcpu *v, const struct pirq *pirq);
     void (*update_vlapic_mode)(struct vcpu *v);
 
     /*Walk nested p2m  */
@@ -835,9 +834,9 @@ static inline void hvm_set_nonreg_state(struct vcpu *v,
 }
 
 static inline int hvm_pi_update_irte(const struct vcpu *v,
-                                     const struct pirq *pirq, uint8_t gvec)
+                                     const struct pirq *pirq)
 {
-    return alternative_call(hvm_funcs.pi_update_irte, v, pirq, gvec);
+    return alternative_call(hvm_funcs.pi_update_irte, v, pirq);
 }
 
 static inline void hvm_update_vlapic_mode(struct vcpu *v)

xen/drivers/passthrough/x86/hvm.c

@@ -388,7 +388,7 @@ int pt_irq_create_bind(
         /* Use interrupt posting if it is supported. */
         if ( iommu_intpost )
         {
-            rc = hvm_pi_update_irte(vcpu, info, pirq_dpci->gmsi.gvec);
+            rc = hvm_pi_update_irte(vcpu, info);
 
             if ( rc )
             {
@@ -689,7 +689,7 @@ int pt_irq_destroy_bind(
             what = "bogus";
     }
     else if ( pirq_dpci && pirq_dpci->gmsi.posted )
-        hvm_pi_update_irte(NULL, pirq, 0);
+        hvm_pi_update_irte(NULL, pirq);
 
     if ( pirq_dpci && (pirq_dpci->flags & HVM_IRQ_DPCI_MAPPED) &&
          list_empty(&pirq_dpci->digl_list) )