On 23/11/2015 18:11, Estrada, Zachary J wrote: > I'm playing around with EPTs and kvm to track execution in the guest. > I've created a separate set of EPTs (and copied the last level entries > from the real tables, minus execute permissions) but I'm not getting > exits where I expect. I also have code in handle_ept_violation to > preserve those permissions for any non-execute ept violations. > > Here is what I am calling within a VM Exit handler: > --- > kvm_mmu_unload(vcpu); > vcpu->arch.mmu.root_hpa = eptp; > kvm_x86_ops->set_tdp_cr3(vcpu, eptp); > kvm_mmu_load(vcpu); > kvm_flush_remote_tlbs(vcpu->kvm); > --- > > I think some of this is overkill, but am I missing something? I think I > may need to flush the rmaps too, but I'm not exactly sure how. My suggestion is: 1) use tracing and check that kvm_mmu_get_page is being called correctly. 2) there is already code for write protection. Try copying that code instead of doing a complete reimplementation. Paolo -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
