From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gleb Natapov Subject: Re: [PATCH 0/4] random,x86,kvm: Add and use MSR_KVM_GET_RNG_SEED Date: Wed, 16 Jul 2014 17:53:22 +0300 Message-ID: <20140716145322.GX18167@minantech.com> References: <20140716064110.GV18167@minantech.com> <53C62563.6050106@redhat.com> <53C62B68.50702@redhat.com> <53C68CF3.5070208@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Andy Lutomirski , Daniel Borkmann , kvm list , "H. Peter Anvin" , Theodore Ts'o , "linux-kernel@vger.kernel.org" , Kees Cook , X86 ML , Srivatsa Vaddagiri , Raghavendra K T To: Paolo Bonzini Return-path: Received: from mail-wi0-f171.google.com ([209.85.212.171]:46059 "EHLO mail-wi0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934066AbaGPOxb (ORCPT ); Wed, 16 Jul 2014 10:53:31 -0400 Received: by mail-wi0-f171.google.com with SMTP id hi2so6370600wib.4 for ; Wed, 16 Jul 2014 07:53:30 -0700 (PDT) Content-Disposition: inline In-Reply-To: <53C68CF3.5070208@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: On Wed, Jul 16, 2014 at 04:32:19PM +0200, Paolo Bonzini wrote: > Il 16/07/2014 16:07, Andy Lutomirski ha scritto: > >This patch has nothing whatsoever to do with how much I trust the CPU > >vs the hypervisor. It's for the enormous installed base of machines > >without RDRAND. > > Ok. I think an MSR is fine, though I don't think it's useful for the guest > to use it if it already has RDRAND and/or RDSEED. > Agree. It is unfortunate that we add PV interfaces for a HW that will be extinct in a couple of years though :( -- Gleb.