[RFC Patch v3 18/18] x86/hvm: Always set pending event injection when loading VMC[BS] state.

[Wen Congyang <wency@cn.fujitsu.com>]

In colo mode, secondary vm is running, so VM_ENTRY_INTR_INFO may
valid before restoring vmcs. If there is no pending event after
restoring vm, we should clear it.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>

Also clear pending software exceptions.
Copy the fix to SVM as well.

Signed-off-by: Tim Deegan <tim@xen.org>

vmx part:
Cc: Jun Nakajima <jun.nakajima@intel.com>
Acked-by: Kevin Tian <kevin.tian@intel.com>

svm part:
Cc: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
 xen/arch/x86/hvm/svm/svm.c | 15 ++++++++-------
 xen/arch/x86/hvm/vmx/vmx.c | 25 ++++++++++++-------------
 2 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/xen/arch/x86/hvm/svm/svm.c b/xen/arch/x86/hvm/svm/svm.c
index b5188e6..053e511 100644
--- a/xen/arch/x86/hvm/svm/svm.c
+++ b/xen/arch/x86/hvm/svm/svm.c
@@ -321,16 +321,17 @@ static int svm_vmcb_restore(struct vcpu *v, struct hvm_hw_cpu *c)
         vmcb_set_h_cr3(vmcb, pagetable_get_paddr(p2m_get_pagetable(p2m)));
     }
 
-    if ( c->pending_valid ) 
+    if ( c->pending_valid &&
+         hvm_event_needs_reinjection(c->pending_type, c->pending_vector) )
     {
         gdprintk(XENLOG_INFO, "Re-injecting %#"PRIx32", %#"PRIx32"\n",
                  c->pending_event, c->error_code);
-
-        if ( hvm_event_needs_reinjection(c->pending_type, c->pending_vector) )
-        {
-            vmcb->eventinj.bytes = c->pending_event;
-            vmcb->eventinj.fields.errorcode = c->error_code;
-        }
+        vmcb->eventinj.bytes = c->pending_event;
+        vmcb->eventinj.fields.errorcode = c->error_code;
+    }
+    else
+    {
+        vmcb->eventinj.bytes = 0;
     }
 
     vmcb->cleanbits.bytes = 0;
diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index 26b1ad5..6ebc945 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -510,23 +510,22 @@ static int vmx_vmcs_restore(struct vcpu *v, struct hvm_hw_cpu *c)
 
     __vmwrite(GUEST_DR7, c->dr7);
 
-    vmx_vmcs_exit(v);
-
-    paging_update_paging_modes(v);
-
-    if ( c->pending_valid )
+    if ( c->pending_valid &&
+         hvm_event_needs_reinjection(c->pending_type, c->pending_vector) )
     {
         gdprintk(XENLOG_INFO, "Re-injecting %#"PRIx32", %#"PRIx32"\n",
                  c->pending_event, c->error_code);
-
-        if ( hvm_event_needs_reinjection(c->pending_type, c->pending_vector) )
-        {
-            vmx_vmcs_enter(v);
-            __vmwrite(VM_ENTRY_INTR_INFO, c->pending_event);
-            __vmwrite(VM_ENTRY_EXCEPTION_ERROR_CODE, c->error_code);
-            vmx_vmcs_exit(v);
-        }
+        __vmwrite(VM_ENTRY_INTR_INFO, c->pending_event);
+        __vmwrite(VM_ENTRY_EXCEPTION_ERROR_CODE, c->error_code);
+    }
+    else
+    {
+        __vmwrite(VM_ENTRY_INTR_INFO, 0);
+        __vmwrite(VM_ENTRY_EXCEPTION_ERROR_CODE, 0);
     }
+    vmx_vmcs_exit(v);
+
+    paging_update_paging_modes(v);
 
     return 0;
 }
-- 
1.9.3