[Xen-devel] [PATCH 18 of 20] Lazy FPU for n2 guest

[Eddie Dong <eddie.dong@xxxxxxxxx>]

# HG changeset patch
# User Eddie Dong <eddie.dong@xxxxxxxxx>
# Date 1307607849 -28800
# Node ID 187ed9f1603db8a09f465cc67a8febce716d4744
# Parent  5c3ab1e07ab1c1a903660f1c48a54aa67f738a7e
Lazy FPU for n2 guest

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

diff -r 5c3ab1e07ab1 -r 187ed9f1603d xen/arch/x86/hvm/vmx/vvmx.c
--- a/xen/arch/x86/hvm/vmx/vvmx.c       Thu Jun 09 16:24:09 2011 +0800
+++ b/xen/arch/x86/hvm/vmx/vvmx.c       Thu Jun 09 16:24:09 2011 +0800
@@ -820,6 +820,9 @@ static void virtual_vmentry(struct cpu_u
     regs->rsp = __get_vvmcs(vvmcs, GUEST_RSP);
     regs->rflags = __get_vvmcs(vvmcs, GUEST_RFLAGS);
 
+    /* updating host cr0 to sync TS bit */
+    __vmwrite(HOST_CR0, v->arch.hvm_vmx.host_cr0);
+
     /* TODO: EPT_POINTER */
 }
 
@@ -968,6 +971,9 @@ static void virtual_vmexit(struct cpu_us
     regs->rsp = __get_vvmcs(nvcpu->nv_vvmcx, 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);
 }
 
@@ -1315,13 +1321,18 @@ int nvmx_n2_vmexit_handler(struct cpu_us
 
         /*
          * 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) )
                 nvcpu->nv_vmexit_pending = 1;
         }
+        else if ( vector == TRAP_no_device )
+        {
+            if ( v->fpu_dirtied )
+                nvcpu->nv_vmexit_pending = 1;
+        }
         else if ( (intr_info & valid_mask) == valid_mask )
         {
             exec_bitmap =__get_vvmcs(nvcpu->nv_vvmcx, EXCEPTION_BITMAP);

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