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

["Zhang, Yang Z" <yang.z.zhang@xxxxxxxxx>]

Boris Ostrovsky wrote on 2013-10-09:
> 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].
So is it ok to change the code according Jan's suggestion?

Best regards,
Yang


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