Messages in this thread | | | Subject | Re: [RFC PATCH 3/3] nSVM: use svm->nested.save to load vmcb12 registers and avoid TOC/TOU races | From | Emanuele Giuseppe Esposito <> | Date | Tue, 14 Sep 2021 10:20:32 +0200 |
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On 12/09/2021 12:42, Maxim Levitsky wrote: >> >> - if (!nested_vmcb_valid_sregs(vcpu, &vmcb12->save) || >> + if (!nested_vmcb_valid_sregs(vcpu, &svm->nested.save) || >> !nested_vmcb_check_controls(vcpu, &svm->nested.ctl)) {
> If you use a different struct for the copied fields, then it makes > sense IMHO to drop the 'control' parameter from nested_vmcb_check_controls, > and just use the svm->nested.save there directly. >
Ok, what you say in patch 2 makes sense to me. I can create a new struct vmcb_save_area_cached, but I need to keep nested.ctl because 1) it is used also elsewhere, and different fields from the one checked here are read/set and 2) using another structure (or the same vmcb_save_area_cached) in its place would just duplicate the same fields of nested.ctl, creating even more confusion and possible inconsistency.
Let me know if you disagree.
Thank you, Emanuele
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