x86/dpci: EOI interrupt regardless of its masking status

Modify hvm_pirq_eoi to always EOI the interrupt if required, instead
of not doing such EOI if the interrupt is routed through the vIO-APIC
and the entry is masked at the time the EOI is performed.

Further unmask of the vIO-APIC pin won't EOI the interrupt, and thus
the guest OS has to wait for the timeout to expire and the automatic
EOI to be performed.

This allows to simplify the helpers and drop the vioapic_redir_entry
parameter from all of them.

Fixes: ccfe4e08455 ('Intel vt-d specific changes in arch/x86/hvm/vmx/vtd.')
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>

diff --git a/xen/arch/x86/hvm/vioapic.c b/xen/arch/x86/hvm/vioapic.c
index 7c462a44d42648d9f44ceb4f25fc89c33e9db2a7..eb6c143f743ac888c4846dd68c3947bc3ff09727 100644 (file)
--- a/xen/arch/x86/hvm/vioapic.c
+++ b/xen/arch/x86/hvm/vioapic.c
@@ -521,7 +521,7 @@ void vioapic_update_EOI(struct domain *d, u8 vector)
             if ( is_iommu_enabled(d) )
             {
                 spin_unlock(&d->arch.hvm.irq_lock);
-                hvm_dpci_eoi(d, vioapic->base_gsi + pin, ent);
+                hvm_dpci_eoi(d, vioapic->base_gsi + pin);
                 spin_lock(&d->arch.hvm.irq_lock);
             }
 

diff --git a/xen/arch/x86/hvm/vpic.c b/xen/arch/x86/hvm/vpic.c
index 3cf12581e94836d40d1bc6f45c66666c90dab8e1..c1c1de7fd0021ae1ec5696a3e7b1e98745c11e1d 100644 (file)
--- a/xen/arch/x86/hvm/vpic.c
+++ b/xen/arch/x86/hvm/vpic.c
@@ -263,8 +263,7 @@ static void vpic_ioport_write(
                 vpic_update_int_output(vpic);
                 vpic_unlock(vpic);
                 hvm_dpci_eoi(current->domain,
-                             hvm_isa_irq_to_gsi((addr >> 7) ? (pin | 8) : pin),
-                             NULL);
+                             hvm_isa_irq_to_gsi((addr >> 7) ? (pin | 8) : pin));
                 return; /* bail immediately */
             case 6: /* Set Priority                */
                 vpic->priority_add = (val + 1) & 7;

diff --git a/xen/drivers/passthrough/x86/hvm.c b/xen/drivers/passthrough/x86/hvm.c
index 41cfa2e2002915c3b8c2d0615fd1b4cf1254a278..edc8059518a5d2b6f07aa1a2ca3c0fd3e8fe60eb 100644 (file)
--- a/xen/drivers/passthrough/x86/hvm.c
+++ b/xen/drivers/passthrough/x86/hvm.c
@@ -950,8 +950,7 @@ static void hvm_dirq_assist(struct domain *d, struct hvm_pirq_dpci *pirq_dpci)
     spin_unlock(&d->event_lock);
 }
 
-static void hvm_pirq_eoi(struct pirq *pirq,
-                         const union vioapic_redir_entry *ent)
+static void hvm_pirq_eoi(struct pirq *pirq)
 {
     struct hvm_pirq_dpci *pirq_dpci;
 
@@ -968,7 +967,6 @@ static void hvm_pirq_eoi(struct pirq *pirq,
      * since interrupt is still not EOIed
      */
     if ( --pirq_dpci->pending ||
-         (ent && ent->fields.mask) ||
          !pt_irq_need_timer(pirq_dpci->flags) )
         return;
 
@@ -977,19 +975,17 @@ static void hvm_pirq_eoi(struct pirq *pirq,
 }
 
 static void __hvm_dpci_eoi(struct domain *d,
-                           const struct hvm_girq_dpci_mapping *girq,
-                           const union vioapic_redir_entry *ent)
+                           const struct hvm_girq_dpci_mapping *girq)
 {
     struct pirq *pirq = pirq_info(d, girq->machine_gsi);
 
     if ( !hvm_domain_use_pirq(d, pirq) )
         hvm_pci_intx_deassert(d, girq->device, girq->intx);
 
-    hvm_pirq_eoi(pirq, ent);
+    hvm_pirq_eoi(pirq);
 }
 
-static void hvm_gsi_eoi(struct domain *d, unsigned int gsi,
-                        const union vioapic_redir_entry *ent)
+static void hvm_gsi_eoi(struct domain *d, unsigned int gsi)
 {
     struct pirq *pirq = pirq_info(d, gsi);
 
@@ -998,11 +994,10 @@ static void hvm_gsi_eoi(struct domain *d, unsigned int gsi,
         return;
 
     hvm_gsi_deassert(d, gsi);
-    hvm_pirq_eoi(pirq, ent);
+    hvm_pirq_eoi(pirq);
 }
 
-void hvm_dpci_eoi(struct domain *d, unsigned int guest_gsi,
-                  const union vioapic_redir_entry *ent)
+void hvm_dpci_eoi(struct domain *d, unsigned int guest_gsi)
 {
     const struct hvm_irq_dpci *hvm_irq_dpci;
     const struct hvm_girq_dpci_mapping *girq;
@@ -1013,7 +1008,7 @@ void hvm_dpci_eoi(struct domain *d, unsigned int guest_gsi,
     if ( is_hardware_domain(d) )
     {
         spin_lock(&d->event_lock);
-        hvm_gsi_eoi(d, guest_gsi, ent);
+        hvm_gsi_eoi(d, guest_gsi);
         goto unlock;
     }
 
@@ -1030,7 +1025,7 @@ void hvm_dpci_eoi(struct domain *d, unsigned int guest_gsi,
         goto unlock;
 
     list_for_each_entry ( girq, &hvm_irq_dpci->girq[guest_gsi], list )
-        __hvm_dpci_eoi(d, girq, ent);
+        __hvm_dpci_eoi(d, girq);
 
 unlock:
     spin_unlock(&d->event_lock);

diff --git a/xen/include/asm-x86/hvm/io.h b/xen/include/asm-x86/hvm/io.h
index 558426b772599a9a920c750831f01b231671c395..9453b9b2b7f36e896843279fbc7210d916895a9e 100644 (file)
--- a/xen/include/asm-x86/hvm/io.h
+++ b/xen/include/asm-x86/hvm/io.h
@@ -118,8 +118,7 @@ bool handle_mmio_with_translation(unsigned long gla, unsigned long gpfn,
                                   struct npfec);
 bool handle_pio(uint16_t port, unsigned int size, int dir);
 void hvm_interrupt_post(struct vcpu *v, int vector, int type);
-void hvm_dpci_eoi(struct domain *d, unsigned int guest_irq,
-                  const union vioapic_redir_entry *ent);
+void hvm_dpci_eoi(struct domain *d, unsigned int guest_irq);
 void msix_write_completion(struct vcpu *);
 
 #ifdef CONFIG_HVM