[Xen-changelog] [xen master] VMX: relax incoming BNDCFGS check

[patchbot@xxxxxxx]

commit 268ead59ce10967cf7490353d743ebc1bb7a9a4c
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri Jun 3 15:28:10 2016 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Jun 3 15:28:10 2016 +0200

    VMX: relax incoming BNDCFGS check
    
    Accepting zero here even when !cpu_has_mpx makes the restore side
    symmetric to the save logic (which avoids saving the value if zero),
    i.e. makes either side independent of the logic on the other side.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>
    Release-acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vmx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index 3acf1ab..743b5a1 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -824,7 +824,7 @@ static int vmx_load_msr(struct vcpu *v, struct hvm_msr 
*ctxt)
         case MSR_IA32_BNDCFGS:
             if ( cpu_has_mpx )
                 __vmwrite(GUEST_BNDCFGS, ctxt->msr[i].val);
-            else
+            else if ( ctxt->msr[i].val )
                 err = -ENXIO;
             break;
         case MSR_IA32_XSS:
--
generated by git-patchbot for /home/xen/git/xen.git#master

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