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X-CSE-ConnectionGUID: 0mj/lpWfSQiHRLY6B4QaKQ== X-CSE-MsgGUID: iRyAbbhLRtCuvzMzLYj9Ug== X-IronPort-AV: E=McAfee;i="6700,10204,11410"; a="45949441" X-IronPort-AV: E=Sophos;i="6.15,229,1739865600"; d="scan'208";a="45949441" Received: from fmviesa006.fm.intel.com ([10.60.135.146]) by fmvoesa113.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Apr 2025 18:18:50 -0700 X-CSE-ConnectionGUID: vNHeqBcvQcynHRk+eJuWEA== X-CSE-MsgGUID: bROkwlhdSuShbpsam8FOpQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.15,229,1739865600"; d="scan'208";a="131719748" Received: from jairdeje-mobl1.amr.corp.intel.com (HELO [10.124.220.113]) ([10.124.220.113]) by fmviesa006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Apr 2025 18:18:49 -0700 Message-ID: <07132e5a-d334-43b6-8905-4e1ca991b3fa@intel.com> Date: Mon, 21 Apr 2025 18:18:47 -0700 Precedence: bulk X-Mailing-List: linux-integrity@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v14 09/19] x86: Secure Launch kernel early boot stub To: Ross Philipson , linux-kernel@vger.kernel.org, x86@kernel.org, linux-integrity@vger.kernel.org, linux-doc@vger.kernel.org, linux-crypto@vger.kernel.org, kexec@lists.infradead.org, linux-efi@vger.kernel.org, iommu@lists.linux.dev Cc: dpsmith@apertussolutions.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, dave.hansen@linux.intel.com, ardb@kernel.org, mjg59@srcf.ucam.org, James.Bottomley@hansenpartnership.com, peterhuewe@gmx.de, jarkko@kernel.org, jgg@ziepe.ca, luto@amacapital.net, nivedita@alum.mit.edu, herbert@gondor.apana.org.au, davem@davemloft.net, corbet@lwn.net, ebiederm@xmission.com, dwmw2@infradead.org, baolu.lu@linux.intel.com, kanth.ghatraju@oracle.com, andrew.cooper3@citrix.com, trenchboot-devel@googlegroups.com References: <20250421162712.77452-1-ross.philipson@oracle.com> <20250421162712.77452-10-ross.philipson@oracle.com> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 4/21/25 09:27, Ross Philipson wrote: > +static u64 sl_rdmsr(u32 reg) > +{ > + u64 lo, hi; > + > + asm volatile ("rdmsr" : "=a" (lo), "=d" (hi) : "c" (reg)); > + > + return (hi << 32) | lo; > +} Is there a reason this code doesn't just use boot_rdmsr()?