On Fri, Nov 11, 2016 at 12:54 PM, Nadav Amit <nadav.amit@xxxxxxxxx> wrote: > >> On Nov 10, 2016, at 3:40 PM, Kyle Huey <me@xxxxxxxxxxxx> wrote: >> >> Hardware support for faulting on the cpuid instruction is not required to >> emulate it, because cpuid triggers a VM exit anyways. KVM handles the relevant >> MSRs (MSR_PLATFORM_INFO and MSR_MISC_FEATURES_ENABLE) and upon a >> cpuid-induced VM exit checks the cpuid faulting state and the CPL. >> kvm_require_cpl is even kind enough to inject the GP fault for us. > > I think that for consistency you should also revise em_cpuid() of KVM > instruction emulator. Otherwise it may be a potential security > hazard (as far fetched as it currently seems). Hmm, ok. Do you know how I can test this code path? - Kyle -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
