[Xen-devel] [PATCH v5 17/28] xen/x86: allow disabling the emulated PIC

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

Signed-off-by: Roger Pau Monnà <roger.pau@xxxxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
Changes since v4:
 - Add Andrew Cooper Acked-by.
---
 xen/arch/x86/hvm/vpic.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/hvm/vpic.c b/xen/arch/x86/hvm/vpic.c
index 7c2edc8..5938f40 100644
--- a/xen/arch/x86/hvm/vpic.c
+++ b/xen/arch/x86/hvm/vpic.c
@@ -377,6 +377,9 @@ static int vpic_save(struct domain *d, hvm_domain_context_t 
*h)
     struct hvm_hw_vpic *s;
     int i;
 
+    if ( !has_vpic(d) )
+        return 0;
+
     /* Save the state of both PICs */
     for ( i = 0; i < 2 ; i++ )
     {
@@ -392,7 +395,10 @@ static int vpic_load(struct domain *d, 
hvm_domain_context_t *h)
 {
     struct hvm_hw_vpic *s;
     uint16_t inst;
-    
+
+    if ( !has_vpic(d) )
+        return 0;
+
     /* Which PIC is this? */
     inst = hvm_load_instance(h);
     if ( inst > 1 )
@@ -425,6 +431,9 @@ void vpic_reset(struct domain *d)
 
 void vpic_init(struct domain *d)
 {
+    if ( !has_vpic(d) )
+        return;
+
     vpic_reset(d);
 
     register_portio_handler(d, 0x20, 2, vpic_intercept_pic_io);
-- 
1.9.5 (Apple Git-50.3)


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