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[192.55.52.136]) by mx.google.com with ESMTPS id b5si6115701pjo.26.2019.07.11.15.38.47 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 11 Jul 2019 15:38:47 -0700 (PDT) Received-SPF: pass (google.com: domain of dave.hansen@intel.com designates 192.55.52.136 as permitted sender) client-ip=192.55.52.136; Authentication-Results: mx.google.com; spf=pass (google.com: domain of dave.hansen@intel.com designates 192.55.52.136 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 orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 11 Jul 2019 15:38:46 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.63,480,1557212400"; d="scan'208";a="156961083" Received: from ray.jf.intel.com (HELO [10.7.201.139]) ([10.7.201.139]) by orsmga007.jf.intel.com with ESMTP; 11 Jul 2019 15:38:46 -0700 Subject: Re: [RFC v2 00/27] Kernel Address Space Isolation To: Alexandre Chartre , pbonzini@redhat.com, rkrcmar@redhat.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, kvm@vger.kernel.org, x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: konrad.wilk@oracle.com, jan.setjeeilers@oracle.com, liran.alon@oracle.com, jwadams@google.com, graf@amazon.de, rppt@linux.vnet.ibm.com References: <1562855138-19507-1-git-send-email-alexandre.chartre@oracle.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/60.7.2 MIME-Version: 1.0 In-Reply-To: <1562855138-19507-1-git-send-email-alexandre.chartre@oracle.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 7/11/19 7:25 AM, Alexandre Chartre wrote: > - Kernel code mapped to the ASI page-table has been reduced to: > . the entire kernel (I still need to test with only the kernel text) > . the cpu entry area (because we need the GDT to be mapped) > . the cpu ASI session (for managing ASI) > . the current stack > > - Optionally, an ASI can request the following kernel mapping to be added: > . the stack canary > . the cpu offsets (this_cpu_off) > . the current task > . RCU data (rcu_data) > . CPU HW events (cpu_hw_events). I don't see the per-cpu areas in here. But, the ASI macros in entry_64.S (and asi_start_abort()) use per-cpu data. Also, this stuff seems to do naughty stuff (calling C code, touching per-cpu data) before the PTI CR3 writes have been done. But, I don't see anything excluding PTI and this code from coexisting.