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a="167189145" X-IronPort-AV: E=Sophos;i="5.77,395,1596524400"; d="scan'208";a="167189145" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Oct 2020 10:58:28 -0700 IronPort-SDR: pRe9WnxncbEp4R3by2ChI7uuxTECbyWwkQc6gzrSw2/doEIqsbLTJ0VukZQ8ZqkybWKkHOAFRn lw52fjMhdzsg== X-IronPort-AV: E=Sophos;i="5.77,395,1596524400"; d="scan'208";a="522077823" Received: from haixinlu-mobl1.amr.corp.intel.com (HELO [10.212.84.56]) ([10.212.84.56]) by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Oct 2020 10:58:27 -0700 Subject: Re: [PATCH v39 05/24] x86/sgx: Add wrappers for ENCLS leaf functions To: Sean Christopherson Cc: Jarkko Sakkinen , x86@kernel.org, linux-sgx@vger.kernel.org, linux-kernel@vger.kernel.org, Jethro Beekman , Darren Kenny , akpm@linux-foundation.org, andriy.shevchenko@linux.intel.com, asapek@google.com, bp@alien8.de, cedric.xing@intel.com, chenalexchen@google.com, conradparker@google.com, cyhanish@google.com, haitao.huang@intel.com, kai.huang@intel.com, kai.svahn@intel.com, kmoy@google.com, ludloff@google.com, luto@kernel.org, nhorman@redhat.com, npmccallum@redhat.com, puiterwijk@redhat.com, rientjes@google.com, tglx@linutronix.de, yaozhangx@google.com, mikko.ylinen@intel.com References: <20201003045059.665934-1-jarkko.sakkinen@linux.intel.com> <20201003045059.665934-6-jarkko.sakkinen@linux.intel.com> <20201019173840.GA22119@linux.intel.com> <20201019175353.GB22358@linux.intel.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20201019175353.GB22358@linux.intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/19/20 10:53 AM, Sean Christopherson wrote: >>> SGX1 CPUs take an erratum on the #PF behavior, e.g. "KBW90 Violation of Intel >>> SGX Access-Control Requirements Produce #GP Instead of #PF". >>> >>> https://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/xeon-e3-1200v6-spec-update.pdf >> OK, but that's only for "Intel ® Xeon ® E3-1200 v6 Processor Family", >> specifically stepping B-0. That's far from a broad erratum. I *see* it >> in other errata lists, but I still think this is too broad. >> >> Also, what if a hypervisor masks the SGX2 cpuid bit on SGX2-capable >> hardware? Won't the hardware still exhibit the erratum? >> >> I don't think we can control model-specific errata behavior with an >> architectural CPUID bit. > Hmm, true. Checking for #PF _or_ #GP on SGX1 CPUs would be my first choice. > ENCLS #GPs for other reasons, most of which would indicate a kernel bug. It'd > be nice to limit the "#GP is expected, sort of" behavior to CPUs that might be > affected by an erratum. Yes, agreed. We need a model/family/stepping list of all the affected CPUs, and a normal old match_cpu() or whatever. If a hypervisor lies about model/family/stepping, then the fallout is on them, not the guest.