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X-CSE-ConnectionGUID: XqhBmBN1RCSuKTVGfdxBcQ== X-CSE-MsgGUID: +HEprIYLTCqofW4LRWRpTw== X-IronPort-AV: E=McAfee;i="6800,10657,11699"; a="59696490" X-IronPort-AV: E=Sophos;i="6.21,287,1763452800"; d="scan'208";a="59696490" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by fmvoesa110.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Feb 2026 15:31:41 -0800 X-CSE-ConnectionGUID: /Gd6wf8wQPOC/0PoCirF/Q== X-CSE-MsgGUID: mShOFWcnT9eu/LRdILsFQw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,287,1763452800"; d="scan'208";a="243351667" Received: from ssimmeri-mobl2.amr.corp.intel.com (HELO [10.125.108.202]) ([10.125.108.202]) by orviesa002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Feb 2026 15:31:41 -0800 Message-ID: Date: Thu, 12 Feb 2026 15:31:37 -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: [BUG] Fault during memory acceptance for TDX VMs with certain memory sizes To: Moritz Sanft , ardb@kernel.org, "Edgecombe, Rick P" , Kiryl Shutsemau , "Weiny, Ira" , "Wunner, Lukas" Cc: linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org References: 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 2/12/26 08:29, Moritz Sanft wrote: > Based on our current (trial-and-error-based) knowledge, the issue only > occurs on TDX VMs with memory sizes >64GB, where the memory size is not > aligned to a multiple of 1024. For instance, the QEMU argument `-m 67G` > works, while `-m 67000M` results in the crash cited below. The > configurations we've tested so far are as follows: I don't see any outrageous bugs in the code. I'm going to take a guess though: the 'unit_size' and the bitmap size don't match or aren't consistent. I'd guess that _something_ is unaligned and you're running off the end of the bitmap or the *mapping* for the bitmap. Any chance you can throw a bunch of printk()'s in the kernel and see what all the fields in here are: struct efi_unaccepted_memory { u32 version; u32 unit_size; u64 phys_base; u64 size; unsigned long bitmap[]; }; Along with the address of bitmap[] and all the calls to: bitmap_clear()? That that should shed some light on it. Any other TDX folks that want to try and reproduce this and do the same would also be much appreciated!