Messages in this thread | | | Subject | Re: [PATCH v3 7/9] KVM: nSVM: implement nested_svm_load_cr3() and use it for host->guest switch | From | Paolo Bonzini <> | Date | Fri, 10 Jul 2020 14:08:30 +0200 |
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On 10/07/20 13:40, Vitaly Kuznetsov wrote: > Hm, it seems I missed svm_set_nested_state() path > completely. Surprisingly, state_test didn't fail) > > I'm struggling a bit to understand why we don't have kvm_set_cr3() on > svm_set_nested_state() path: enter_svm_guest_mode() does it through > nested_prepare_vmcb_save() but it is skipped in svm_set_nested_state(). > Don't we need it at least for !npt_enabled case?
In svm_set_nested_state you'll have CR3 already set to the right value. On the source, KVM_GET_SREGS returns the vmcb12's CR3 and it is already restored with KVM_SET_SREGS on the destination before set_nested_state.
So, only the nested_cr3 has to be set.
Paolo
> We'll have to extract > nested_cr3 from nested_vmcb then.
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