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Mon, 05 Oct 2026 14:59:08 +0000 X-Mizu-Trace-ID: 93dd8002214013a1 X-Migadu-Flow: FLOW_OUT Message-ID: <0a0f7ae5-5fa0-430c-8074-9217f594a563@linux.dev> Date: Mon, 5 Oct 2026 22:58:52 +0800 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: Borislav Petkov Cc: Andrew Cooper , Pedro Falcato , dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, tglx@kernel.org, mingo@redhat.com, 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> <6801221a-6307-407a-85fc-46906f95d22e@linux.dev> <20261005142216.GAasOymJHYnmn6wD5m@fat_crate.local> <20261005145315.GCasO523MWyIIx2ngl@fat_crate.local> From: Lance Yang In-Reply-To: <20261005145315.GCasO523MWyIIx2ngl@fat_crate.local> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: B96B9A000E X-Rspam-User: X-Stat-Signature: zt8iib33ku5ajapn8wc41p6f8eu3hoix X-HE-Tag: 1791212360-867174 X-HE-Meta: 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 2Sv/RQqt 2+cl0V4Qm3JU7M5mjvxvtmtNo5fa21Y/OH7NeBVwRsWqB2L0rSd9ia3hVB9c5QXBBHZV13Jnd0fzGvoAq6p0yRekOeN3ey0ZgsijIf5mXhKlToPGhLqgJYMrr3E5wCBLuJyfyC4B5hGw4znF5+HKn3cs1WLFDuBV0wY1x+rjulFe6u8oVDCr1fsVQlIGIF+8ByXjGldGeQD/ovHhdpbmeifj1UHzKDOHQyKVTvuD8BNFXYdKU8yjj0AY+7aE0AWkSES3T6swt7UhQu4dnOOfUtesE9+6TmGXgUY3D67MsjSV6ErlHNIo5OzuKc1lDyal7ZqdVQqnNDdkLZu5s+Vh2r41EHAl8T70+21cqX2gwjLhpuoj2x7DWXWB4HAL4rkArV9Yn8X7ppq3hEU46ul3p5IMa/w== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2026/10/5 22:53, Borislav Petkov wrote: > On Mon, Oct 05, 2026 at 10:36:26PM +0800, Lance Yang wrote: >> I don't have an AMD machine to test this on. I spotted something >> that looked wrong in the code and sent it out to see what others >> think. > > You send a normal mail - not a patch. > >> Maybe I'm reading the manual wrong, but is raising a concern >> based on the code and the manual really just "a wild hunch"? > > If it is formulated like a patch which is supposed to be even urgent, then > you're reading our process wrong. > > https://docs.kernel.org/process/development-process.html > > And since you have not tested it to actually fix anything, then this patch is > nothing but a wild hunch. > > And to answer your question, no, it is not needed. Definitely not the TCE > angle. > > Now, the speculative thing is another story but that whole story you're > referring to needs a lot more debugging. > > But we do not apply patches on a wild hunch, without any definitive data that > they fix an issue and, if very much possible, with a clear explanation why > they fix it. OK, let's drop the patch.