❦ 8 janvier 2018 21:19 -0200, Eduardo Habkost <ehabk...@redhat.com> :
>> > GET_SUPPORTED_CPUID seems to still return PCID as supported >> > without EPT, doesn't it? >> >> Indeed it is! It will also be useful for KPTI performance without >> INVPCID, but it won't be useful without EPT. > > Well, I can live with "not useful without EPT", as long as it > doesn't mean "broken without EPT". It looks like we can safely > enable it, as long as: > > 2) we confirm if all Intel Westmere/SandyBridge/IvyBridge CPUs > have PCID; I didn't find an authoritative information about that on Intel website. Various sites indeed says the feature was introduced in Westmere. And Greg KH mentions Westmere here too: https://mail-archive.com/linux-kernel@vger.kernel.org/msg1576774.html > 1) QEMU documentation states that it requires Linux v3.6 or newer > for KVM. I have updated the patch and sent it in a new thread. It's now based on x86-next. -- Clothes make the man. Naked people have little or no influence on society. -- Mark Twain
