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[192.55.52.88]) by mx.google.com with ESMTPS id k17si10984619pfi.230.2019.06.17.08.50.36 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 17 Jun 2019 08:50:36 -0700 (PDT) Received-SPF: pass (google.com: domain of dave.hansen@intel.com designates 192.55.52.88 as permitted sender) client-ip=192.55.52.88; Authentication-Results: mx.google.com; spf=pass (google.com: domain of dave.hansen@intel.com designates 192.55.52.88 as permitted sender) smtp.mailfrom=dave.hansen@intel.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Jun 2019 08:50:35 -0700 X-ExtLoop1: 1 Received: from ray.jf.intel.com (HELO [10.7.201.126]) ([10.7.201.126]) by orsmga002.jf.intel.com with ESMTP; 17 Jun 2019 08:50:35 -0700 Subject: Re: [RFC 00/10] Process-local memory allocations for hiding KVM secrets To: Alexander Graf , Thomas Gleixner , Andy Lutomirski Cc: Marius Hillenbrand , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-hardening@lists.openwall.com, linux-mm@kvack.org, Alexander Graf , David Woodhouse , the arch/x86 maintainers , Andy Lutomirski , Peter Zijlstra References: <20190612170834.14855-1-mhillenb@amazon.de> <58788f05-04c3-e71c-12c3-0123be55012c@amazon.com> 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/60.7.0 MIME-Version: 1.0 In-Reply-To: <58788f05-04c3-e71c-12c3-0123be55012c@amazon.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 6/17/19 12:38 AM, Alexander Graf wrote: >> Yes I know, but as a benefit we could get rid of all the GSBASE >> horrors in >> the entry code as we could just put the percpu space into the local PGD. > > Would that mean that with Meltdown affected CPUs we open speculation > attacks against the mmlocal memory from KVM user space? Not necessarily. There would likely be a _set_ of local PGDs. We could still have pair of PTI PGDs just like we do know, they'd just be a local PGD pair.