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Re: [Xen-devel] [PATCH] Nested VMX: CR emulation fix up



On 10/09/2013 03:28 AM, Zhang, Yang Z wrote:
Boris Ostrovsky wrote on 2013-10-08:
On 10/08/2013 04:31 AM, Jan Beulich wrote:

Considering that this touches code common with nested SVM, I'd
expect the SVM maintainers to have to approve of the change in any case.

In particular I wonder whether this addition isn't obsoleting SVM's
ns_cr0.

I am not sure whether ns_cr0 (replaced with nv_guest_cr[0]) would then
be updated in paths where it currently is not.

For example in nsvm_vmcb_prepare4vmrun():

      /* CR0 */ svm->ns_cr0 = v->arch.hvm_vcpu.guest_cr[0]; cr0 =
      nestedsvm_fpu_vmentry(svm->ns_cr0, ns_vmcb, n1vmcb, n2vmcb);
      v->arch.hvm_vcpu.guest_cr[0] = ns_vmcb->_cr0; rc =
      hvm_set_cr0(cr0);  <------ nv_guest_cr[0] will get set here.
I am not familiar with SVM code. If you think this change may impact the nested 
SVM. Then I will move the change to VMX specific code.

No, it doesn't affect SVM code. I was responding to Jan's suggestion to replace
SVM's ns_cr0 with the new guest_cr[0].

-boris


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