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X-CSE-ConnectionGUID: uvAzFpSJTpyGgtDqYKgB6g== X-CSE-MsgGUID: fnI+tSm7TbudUkWQE6WvFg== X-IronPort-AV: E=McAfee;i="6700,10204,11359"; a="45377983" X-IronPort-AV: E=Sophos;i="6.13,323,1732608000"; d="scan'208";a="45377983" Received: from fmviesa005.fm.intel.com ([10.60.135.145]) by orvoesa107.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Feb 2025 15:23:40 -0800 X-CSE-ConnectionGUID: c2of4MNRRNygn6xpo8QN/A== X-CSE-MsgGUID: DKA3A9ekSWmSv/pvM2ICDA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.13,323,1732608000"; d="scan'208";a="122080687" Received: from puneetse-mobl.amr.corp.intel.com (HELO [10.125.108.197]) ([10.125.108.197]) by fmviesa005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Feb 2025 15:23:40 -0800 Message-ID: <526df712-6091-4b04-97d5-9007789dc750@intel.com> Date: Fri, 28 Feb 2025 15:23:53 -0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/6] x86/microcode: Support for Intel Staging Feature To: Borislav Petkov , Colin Mitchell Cc: chang.seok.bae@intel.com, dave.hansen@linux.intel.com, linux-kernel@vger.kernel.org, mingo@redhat.com, tglx@linutronix.de, x86@kernel.org References: <20250228222715.3306015-1-colinmitchell@google.com> <20250228225236.GHZ8I-NBTC6L6Qc-iM@fat_crate.local> 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 2/28/25 14:52, Borislav Petkov wrote: > On Fri, Feb 28, 2025 at 02:27:15PM -0800, Colin Mitchell wrote: >> As a potential user, I'd advocate for an option to disable legacy >> loading if staging is supported. > What happens if staging is failing indefinitely, for whatever reason? > > You can't load any microcode anymore if you've disabled the legacy method > too. Yeah, I'm perplexed by this choice too. You seem to be saying that you'd rather be (for instance) insecure running old microcode than have the latency blip from a legacy microcode load. What action would you take if a staging-load fails? Retry again a few times? Go back to the CPU vendor and get a new image? Or just ignore it?