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X-CSE-ConnectionGUID: uDDaidmbT/y41kS5us/Oqw== X-CSE-MsgGUID: 7ZOA7a/RTKasuA78HlTuWg== X-IronPort-AV: E=McAfee;i="6800,10657,11700"; a="72363684" X-IronPort-AV: E=Sophos;i="6.21,288,1763452800"; d="scan'208";a="72363684" Received: from orviesa007.jf.intel.com ([10.64.159.147]) by orvoesa108.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Feb 2026 08:46:57 -0800 X-CSE-ConnectionGUID: 1FgC5MfoRoCr1JF3/IGVDg== X-CSE-MsgGUID: G5hjvY7rQH24nVpK+B85qQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,288,1763452800"; d="scan'208";a="213068569" Received: from dwesterg-mobl1.amr.corp.intel.com (HELO [10.125.109.3]) ([10.125.109.3]) by orviesa007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Feb 2026 08:46:56 -0800 Message-ID: <6d6dd421-774c-4f29-84d5-3e449240eb93@intel.com> Date: Fri, 13 Feb 2026 08:46:55 -0800 Precedence: bulk X-Mailing-List: linux-efi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] efi: Fix reservation of unaccepted memory table To: Kiryl Shutsemau Cc: Ard Biesheuvel , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , Tom Lendacky , x86@kernel.org, linux-efi@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Moritz Sanft References: <20260213154838.46567-1-kas@kernel.org> <20260213154838.46567-2-kas@kernel.org> 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 2/13/26 08:14, Kiryl Shutsemau wrote: >> The memblock code seems to be able to handle arbitrary alignment just fine. > Memblock will track it, but, as the comment says, anything smaller than > page size will not be mapped, but we need the table to be accessible by > kernel. That seems really, really fragile. We should first make sure this is intentional memblock behavior and not a bug before we go add more hacks on top of it. Why would you even present a byte-level reservation interface if it is free to just silently ignore some of the ranges by rounding them off later?