From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta1.migadu.com (out-83.mta1.migadu.com [95.215.58.83]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9B26A473C8C for ; Mon, 5 Oct 2026 10:12:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.83 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791195181; cv=none; b=QLbnNfEcxcZjLlp1NJIpSJWFP3DjEYq2Nvk07wWUMnSH0AzuWfPrwTuw/cw17yZWtWW+9zGePEe0vBKzfSdofEz0nglJmBLWsHBUHZGm9pHiE2v02ytsd9xPmGxbJYbHLbJjFWB5D2GY+D06DodFAh2t2iDJu7y1RCxwJIYYQ1E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791195181; c=relaxed/simple; bh=EEjZqFY3s2FS+GoGeqCsbWhVvDm5TQFLGZuK1OsTwm8=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=sHTLarwZE2/ei2E8UorjkLmiHAL7XnV5uLynQUh28q/EXwJGI1JG/bFvRYTPAiWVu4C0rxXkXaBatoGUar9PTGURZSwJStNtAyv95Qu7gw4ivDbNH8olfuWcHMxwwk3pw8ywyNppR5OigBBU8QRwW3pUi9NKbNPHdX7yJmLmIRw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=vTOH+G8G; arc=none smtp.client-ip=95.215.58.83 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="vTOH+G8G" X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=EEjZqFY3s2FS+GoGeqCsbWhVvDm5TQFLGZuK1OsTwm8=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1791195177; v=1; x=1791799977; b=vTOH+G8GyMY2RgM0AhUwXD7iL1kW6xi8b7U6Oh7cLXWy58zTYdblW0SHDS5zDsqfRZ5LjHBb ME2OV3E3Wo+HEVyjVMm3rHd67zfcaQrIix9p/c8G0WgK/lb/R5pyxaSNTZgrLYjs8hl/oLOoHru As9jWqNkFvf88TtpJbzxPD+0= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id 73aaa0ae9db79217; Mon, 05 Oct 2026 10:12:57 +0000 X-Mizu-Trace-ID: 73aaa0ae9db79217 X-Migadu-Flow: FLOW_OUT Message-ID: <6801221a-6307-407a-85fc-46906f95d22e@linux.dev> Date: Mon, 5 Oct 2026 18:12:45 +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 1/1] x86/mm: fix incomplete page-table invalidation with TCE Content-Language: en-US To: Andrew Cooper , Pedro Falcato Cc: dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, riel@surriel.com, linux-kernel@vger.kernel.org, qi.zheng@linux.dev, nadav.amit@gmail.com, thomas.lendacky@amd.com, kernel-team@meta.com, linux-mm@kvack.org, akpm@linux-foundation.org, brendan.jackman@linux.dev, jannh@google.com, mhklinux@outlook.com, Manali.Shukla@amd.com, mingo@kernel.org, stable@vger.kernel.org, toshi.kani@hpe.com, david@kernel.org, mikhail.v.gavrilov@gmail.com References: <20261005052302.43042-1-lance.yang@linux.dev> <60d5db86-8002-4d87-b8d3-c161d674122b@linux.dev> <38541ec6-d796-4f35-a700-75ab097b6df5@linux.dev> <7ad90e94-d04d-453a-ba22-9640a5024d8c@citrix.com> From: Lance Yang In-Reply-To: <7ad90e94-d04d-453a-ba22-9640a5024d8c@citrix.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 2026/10/5 17:57, Andrew Cooper wrote: > On 05/10/2026 9:32 am, Lance Yang wrote: >> >> >> On 2026/10/5 16:19, Andrew Cooper wrote: >>> On 05/10/2026 8:29 am, Lance Yang wrote: >>>>> >>>>> Did you repro any bug related to this? The functionality is perhaps >>>>> underspecified in the AMD manual. >>>> >>>> TBH, I don't have a reproducer yet. Just LLM stumbled upon this while >>>> I was investigating another memory corruption issue [1]. >>>> >>>> [1] >>>> https://lore.kernel.org/linux-mm/arY1Wq6R9OY20ans@pcnci.linuxbox.cz/#t >>> >>> What hardware are you running on? >>> >>> That looks like the Zen5 issue, for which you want either the latest >>> microcode out of linux-firmware and/or >>> https://lore.kernel.org/r/20261002211617.1001617-1-bp@kernel.org >>> >>> TCE is a no-op in Zen1 and later, so unless you're on older hardware, it >>> won't be that. >> >> Just to clarify ... these are two separate issues. >> >> I mentioned [1] only to explain how this came up while investigating >> something else. I'm not claiming that TCE caused the corruption reported >> there :) > > Please can you answer the question.  Which CPU are you seeing this on? > Which CPU? None so far. As I said, I don't have a reproducer. I'm trying to make sense of what the manual says and what the code does ...