[Xen-devel] [PATCH]Remove EPT guest linear address validation

["Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>]

Remove EPT guest linear address validation

For EPT violation resulting from an attempt to load the guest PDPTEs as part of 
the execution of the MOV CR instruction, the EPT_GLA_VALID is not valid.
This situation should not happen in most situation, since we always populate 
guest memory. But this is not ture for PAE guest under the PoD/Page sharing 
situation. In that situation, a page pointed by CR3 may be un-populated, and we 
need handle it in such situation.

Signed-off-by: Jiang, Yunhong <yunhong.jiang@xxxxxxxxx>

diff -r ff1b80ccecd9 xen/arch/x86/hvm/vmx/vmx.c
--- a/xen/arch/x86/hvm/vmx/vmx.c        Fri Dec 17 16:12:37 2010 +0000
+++ b/xen/arch/x86/hvm/vmx/vmx.c        Mon Dec 20 18:52:16 2010 +0800
@@ -2079,8 +2079,7 @@ static void ept_handle_violation(unsigne
         __trace_var(TRC_HVM_NPF, 0, sizeof(_d), &_d);
     }

-    if ( (qualification & EPT_GLA_VALID) &&
-         hvm_hap_nested_page_fault(gfn) )
+    if ( hvm_hap_nested_page_fault(gfn) )
         return;

     /* Everything else is an error. */

Attachment: remove_ept_linear_address_validation.patch
Description: remove_ept_linear_address_validation.patch

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