[Xen-devel] [PATCH 14/16] vmx: nest: CR0.TS and #NM

[Qing He <qing.he@xxxxxxxxx>]

1. #NM exits from L2 should be handled by L0 if it wants.
2. HOST_CR0.TS may need to be updated after L1<->L2 switch

Signed-off-by: Qing He <qing.he@xxxxxxxxx>
Signed-off-by: Eddie Dong <eddie.dong@xxxxxxxxx>

---

diff -r a5f6653f4c5a xen/arch/x86/hvm/vmx/nest.c
--- a/xen/arch/x86/hvm/vmx/nest.c       Thu Apr 22 21:47:57 2010 +0800
+++ b/xen/arch/x86/hvm/vmx/nest.c       Thu Apr 22 21:49:08 2010 +0800
@@ -791,6 +791,9 @@
     regs->rsp = __get_vvmcs(nest->vvmcs, GUEST_RSP);
     regs->rflags = __get_vvmcs(nest->vvmcs, GUEST_RFLAGS);
 
+    /* updating host cr0 to sync TS bit */
+    __vmwrite(HOST_CR0, v->arch.hvm_vmx.host_cr0);
+
     /* TODO: EPT_POINTER */
 }
 
@@ -927,6 +930,9 @@
     regs->rsp = __get_vvmcs(nest->vvmcs, HOST_RSP);
     regs->rflags = __vmread(GUEST_RFLAGS);
 
+    /* updating host cr0 to sync TS bit */
+    __vmwrite(HOST_CR0, v->arch.hvm_vmx.host_cr0);
+
     vmreturn(regs, VMSUCCEED);
 }
 
@@ -1036,13 +1042,18 @@
 
         /*
          * decided by L0 and L1 exception bitmap, if the vetor is set by
-         * both, L0 has priority on #PF, L1 has priority on others
+         * both, L0 has priority on #PF and #NM, L1 has priority on others
          */
         if ( vector == TRAP_page_fault )
         {
             if ( paging_mode_hap(v->domain) )
                 nest->vmexit_pending = 1;
         }
+        else if ( vector == TRAP_no_device )
+        {
+            if ( v->fpu_dirtied )
+                nest->vmexit_pending = 1;
+        }
         else if ( (intr_info & valid_mask) == valid_mask )
         {
             exec_bitmap =__get_vvmcs(nest->vvmcs, EXCEPTION_BITMAP);

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