[Xen-devel] [PATCH v4 17/31] xen/x86: allow disabling the emulated IO APIC

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Signed-off-by: Roger Pau Monnà <roger.pau@xxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/hvm/vioapic.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/xen/arch/x86/hvm/vioapic.c b/xen/arch/x86/hvm/vioapic.c
index d348235..30a4a0f 100644
--- a/xen/arch/x86/hvm/vioapic.c
+++ b/xen/arch/x86/hvm/vioapic.c
@@ -424,12 +424,20 @@ void vioapic_update_EOI(struct domain *d, u8 vector)
 static int ioapic_save(struct domain *d, hvm_domain_context_t *h)
 {
     struct hvm_hw_vioapic *s = domain_vioapic(d);
+
+    if ( !has_vioapic(d) )
+        return 0;
+
     return hvm_save_entry(IOAPIC, 0, h, s);
 }
 
 static int ioapic_load(struct domain *d, hvm_domain_context_t *h)
 {
     struct hvm_hw_vioapic *s = domain_vioapic(d);
+
+    if ( !has_vioapic(d) )
+        return 0;
+
     return hvm_load_entry(IOAPIC, h, s);
 }
 
@@ -448,6 +456,9 @@ void vioapic_reset(struct domain *d)
 
 int vioapic_init(struct domain *d)
 {
+    if ( !has_vioapic(d) )
+        return 0;
+
     if ( (d->arch.hvm_domain.vioapic == NULL) &&
          ((d->arch.hvm_domain.vioapic = xmalloc(struct hvm_vioapic)) == NULL) )
         return -ENOMEM;
@@ -462,6 +473,9 @@ int vioapic_init(struct domain *d)
 
 void vioapic_deinit(struct domain *d)
 {
+    if ( !has_vioapic(d) )
+        return;
+
     xfree(d->arch.hvm_domain.vioapic);
     d->arch.hvm_domain.vioapic = NULL;
 }
-- 
1.9.5 (Apple Git-50.3)


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