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

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

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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