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12 Jul 2019 06:58:50 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.63,482,1557212400"; d="scan'208";a="166684822" Received: from smatond1-mobl1.amr.corp.intel.com (HELO [10.252.143.186]) ([10.252.143.186]) by fmsmga008.fm.intel.com with ESMTP; 12 Jul 2019 06:58:48 -0700 Subject: Re: [RFC v2 00/27] Kernel Address Space Isolation To: Alexandre Chartre , Peter Zijlstra Cc: Thomas Gleixner , pbonzini@redhat.com, rkrcmar@redhat.com, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, kvm@vger.kernel.org, x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, konrad.wilk@oracle.com, jan.setjeeilers@oracle.com, liran.alon@oracle.com, jwadams@google.com, graf@amazon.de, rppt@linux.vnet.ibm.com, Paul Turner References: <1562855138-19507-1-git-send-email-alexandre.chartre@oracle.com> <5cab2a0e-1034-8748-fcbe-a17cf4fa2cd4@intel.com> <61d5851e-a8bf-e25c-e673-b71c8b83042c@oracle.com> <20190712125059.GP3419@hirez.programming.kicks-ass.net> From: Dave Hansen Openpgp: preference=signencrypt Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 7/12/19 6:43 AM, Alexandre Chartre wrote: > The current approach is assuming that anything in the user address space > can be sensitive, and so the user address space shouldn't be mapped in ASI. Is this universally true? There's certainly *some* mitigation provided by SMAP that would allow userspace to remain mapped and still protected.