From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Bonzini Subject: Re: [RFC PATCH v1 09/28] x86/efi: Access EFI data as encrypted when SEV is active Date: Thu, 22 Sep 2016 20:50:42 +0200 Message-ID: <4e93fbb3-d01c-1fd6-0610-56402eb5c242@redhat.com> References: <147190820782.9523.4967724730957229273.stgit@brijesh-build-machine> <147190832511.9523.10850626471583956499.stgit@brijesh-build-machine> <20160922143545.3kl7khff6vqk7b2t@pd.tnic> <464461b7-1efb-0af1-dd3e-eb919a2578e9@redhat.com> <0012cd4d-d432-ae14-1041-5e8b62973b37@amd.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <0012cd4d-d432-ae14-1041-5e8b62973b37@amd.com> Sender: owner-linux-mm@kvack.org To: Tom Lendacky , Borislav Petkov , Brijesh Singh Cc: simon.guinot@sequanux.org, linux-efi@vger.kernel.org, kvm@vger.kernel.org, rkrcmar@redhat.com, matt@codeblueprint.co.uk, linus.walleij@linaro.org, linux-mm@kvack.org, paul.gortmaker@windriver.com, hpa@zytor.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, mingo@redhat.com, msalter@redhat.com, ross.zwisler@linux.intel.com, dyoung@redhat.com, jroedel@suse.de, keescook@chromium.org, toshi.kani@hpe.com, mathieu.desnoyers@efficios.com, devel@linuxdriverproject.org, 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@ List-Id: linux-efi@vger.kernel.org On 22/09/2016 20:47, Tom Lendacky wrote: > > Because the firmware volume is written to high memory in encrypted form, > > and because the PEI phase runs in 32-bit mode, the firmware code will be > > encrypted; on the other hand, data that is placed in low memory for the > > kernel can be unencrypted, thus limiting differences between SME and SEV. > > I like the idea of limiting the differences but it would leave the EFI > data and ACPI tables exposed and able to be manipulated. Hmm, that makes sense. So I guess this has to stay, and Borislav's proposal doesn't fly either. Paolo -- 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