[PATCH v2 2/8] x86/hvm: Only populate info->cr2 for #PF in hvm_get_pending_event()

[Jinoh Kang <jinoh.kang.kr@xxxxxxxxx>]

Prepare for an upcoming patch that overloads the 'cr2' field for #DB.

Signed-off-by: Jinoh Kang <jinoh.kang.kr@xxxxxxxxx>
---
CC: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CC: Jan Beulich <JBeulich@xxxxxxxx>
CC: Wei Liu <wl@xxxxxxx>
CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
CC: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
CC: Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx>
CC: Petre Pircalabu <ppircalabu@xxxxxxxxxxxxxxx>
---
 xen/arch/x86/hvm/hvm.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 66ead0b878..c726947ccb 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -503,9 +503,14 @@ void hvm_migrate_pirqs(struct vcpu *v)
 
 static bool hvm_get_pending_event(struct vcpu *v, struct x86_event *info)
 {
-    info->cr2 = v->arch.hvm.guest_cr[2];
+    if ( !alternative_call(hvm_funcs.get_pending_event, v, info) )
+        return false;
+
+    if ( info->type == X86_EVENTTYPE_HW_EXCEPTION &&
+         info->vector == X86_EXC_PF )
+        info->cr2 = v->arch.hvm.guest_cr[2];
 
-    return alternative_call(hvm_funcs.get_pending_event, v, info);
+    return true;
 }
 
 void hvm_do_resume(struct vcpu *v)
-- 
2.41.0