From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr0-f200.google.com (mail-wr0-f200.google.com [209.85.128.200]) by kanga.kvack.org (Postfix) with ESMTP id E8DE36B0390 for ; Wed, 29 Mar 2017 11:33:06 -0400 (EDT) Received: by mail-wr0-f200.google.com with SMTP id p52so3815817wrc.8 for ; Wed, 29 Mar 2017 08:33:06 -0700 (PDT) Received: from mx2.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id v132si7611037wmg.99.2017.03.29.08.33.05 for (version=TLS1 cipher=AES128-SHA bits=128/128); Wed, 29 Mar 2017 08:33:05 -0700 (PDT) Date: Wed, 29 Mar 2017 17:32:53 +0200 From: Borislav Petkov Subject: Re: [RFC PATCH v2 16/32] x86: kvm: Provide support to create Guest and HV shared per-CPU variables Message-ID: <20170329153252.kwwyedndwnfgvzcb@pd.tnic> References: <148846752022.2349.13667498174822419498.stgit@brijesh-build-machine> <148846773666.2349.9492983018843773590.stgit@brijesh-build-machine> <20170328183931.rqorduu5fnp5r3y2@pd.tnic> <9a8723fc-300d-eb76-deb1-cbc8492e9d49@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <9a8723fc-300d-eb76-deb1-cbc8492e9d49@redhat.com> Sender: owner-linux-mm@kvack.org List-ID: To: Paolo Bonzini Cc: Brijesh Singh , simon.guinot@sequanux.org, linux-efi@vger.kernel.org, kvm@vger.kernel.org, rkrcmar@redhat.com, matt@codeblueprint.co.uk, linux-pci@vger.kernel.org, linus.walleij@linaro.org, gary.hook@amd.com, linux-mm@kvack.org, paul.gortmaker@windriver.com, hpa@zytor.com, cl@linux.com, dan.j.williams@intel.com, aarcange@redhat.com, sfr@canb.auug.org.au, andriy.shevchenko@linux.intel.com, herbert@gondor.apana.org.au, bhe@redhat.com, xemul@parallels.com, joro@8bytes.org, x86@kernel.org, peterz@infradead.org, piotr.luc@intel.com, mingo@redhat.com, msalter@redhat.com, ross.zwisler@linux.intel.com, dyoung@redhat.com, thomas.lendacky@amd.com, jroedel@suse.de, keescook@chromium.org, arnd@arndb.de, toshi.kani@hpe.com, mathieu.desnoyers@efficios.com, luto@kernel.org, devel@linuxdriverproject.org, bhelgaas@google.com, tglx@linutronix.de, mchehab@kernel.org, iamjoonsoo.kim@lge.com, labbott@fedoraproject.org, tony.luck@intel.com, alexandre.bounine@idt.com, kuleshovmail@gmail.com, linux-kernel@vger.kernel.org, mcgrof@kernel.org, mst@redhat.com, linux-crypto@vger.kernel.org, tj@kernel.org, akpm@linux-foundation.org, davem@davemloft.net On Wed, Mar 29, 2017 at 05:21:13PM +0200, Paolo Bonzini wrote: > The GHCB would have to be allocated much earlier, possibly even by > firmware depending on how things will be designed. How about a statically allocated page like we do with the early pagetable pages in head_64.S? > I think it's premature to consider SEV-ES requirements. My only concern is not to have to redo a lot when SEV-ES gets enabled. So it would be prudent to design with SEV-ES in the back of our minds. -- Regards/Gruss, Boris. SUSE Linux GmbH, GF: Felix ImendA?rffer, Jane Smithard, Graham Norton, HRB 21284 (AG NA 1/4 rnberg) -- -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org