Messages in this thread | | | Date | Thu, 12 Mar 2015 22:20:02 +0100 | From | Radim Krčmář <> | Subject | Re: [PATCH] kvm: x86: svm: remove SVM_EXIT_READ_CR* intercepts |
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2015-03-12 15:17-0500, Joel Schopp: > There isn't really a valid reason for kvm to intercept cr* reads > on svm hardware. The current kvm code just ends up returning > the register
There is no need to intercept CR* if the value that the guest should see is equal to what we set there, but that is not always the case: - CR0 might differ from what the guest should see because of lazy fpu - CR3 isn't intercepted with nested paging and it should differ otherwise - CR4 contains PAE bit when run without nested paging
CR2 and CR8 already aren't intercepted, so it looks like only CR0 and CR4 could use some optimizations.
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