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PH7PR12MB6834.namprd12.prod.outlook.com (2603:10b6:510:1b4::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8356.13; Tue, 14 Jan 2025 15:23:14 +0000 Received: from DM4PR12MB5070.namprd12.prod.outlook.com ([fe80::20a9:919e:fd6b:5a6e]) by DM4PR12MB5070.namprd12.prod.outlook.com ([fe80::20a9:919e:fd6b:5a6e%7]) with mapi id 15.20.8335.017; Tue, 14 Jan 2025 15:23:14 +0000 Message-ID: <0e20a86c-bc4f-2774-3cf7-4424af7becad@amd.com> Date: Tue, 14 Jan 2025 09:23:12 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.15.1 Subject: Re: [PATCH v4 05/12] x86/mm: add INVLPGB support code Content-Language: en-US To: Dave Hansen , Rik van Riel , x86@kernel.org Cc: linux-kernel@vger.kernel.org, bp@alien8.de, peterz@infradead.org, dave.hansen@linux.intel.com, zhengqi.arch@bytedance.com, nadav.amit@gmail.com, kernel-team@meta.com, linux-mm@kvack.org, akpm@linux-foundation.org, jannh@google.com References: 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U2FsdGVkX181XG5i7UqiCJqPNh2jxxnVJqyW/XGPhoildWj4QB7dhi/sBdF+z9Osci77OLqN/O/ykR8DXTzGYrvO7OOzFJSHUgdbbGj/KZaULpuCG4cKnqLo2ch/UgsAmXOTj+h7XybvtyIj89KfO8JwXXtnlzn8JRgkRxCNDHKrvwMP2JzYv08Qd0ITq5ip5Ok0BODPh/Zh5rmM3BjVtPaYPqde1D2yoTO3tgZyqp0MynDjuHd4ZKvji6bInTBm9UutZrqGeC0jpRct2v6D5+hA2qHsVLAqahDXbHn7bGYsIyQp2i34CF1ZeLocFRJ4nmMuX8gmTDsCuoJUtA+7FAyPdcU0D6Gb0sYfOdS6Zmo9b1RFKzJQIghfJhttv0fnpSxh0sS/g4Jk3KWUDg+8hNeB/J+viHkfdtNjFjV6SMzDDimWCgiv4P99le13WLcJlwu+ueIcHUfeSkeYs3nmPNzNeOPfRO6TFeGE6pa1iFi+yRmYbJhYqyRxhIokUbdVrn23CKqkEA+dUUgSCGq6W4uhF6FdkP8U8bf/DegIPt5B3XWXByEmoFA8epLujSOwJu4E8r10EI4rtt9xmDH099wvIXmFbjhhHxbsper4Hz+aEafDamB8jses3H1ytpbLmD3wltgWWStzLgF1r+fEQvL2cUyrJMeH08p/E1awKyy3gmG+LmWPjmiiDoDY/1ApXOxYRaxfy627RyoyXl275XjMQHJvLdMaLMCrj7kofdIyhPmDbJrWzR3tnf6FrdHKkK8KjEJENkvDVafu63/UqPVT/DgkIrilNIB9A2Sv3mGKe+kvjvBLwemj7K91V1tUqGL3HMNPWUOMc1YXH7g7xKTbzPGfFZNlNEoNfRVDUp3W1i/gvAfhP54WvOc4FCQAOY6M/a4a21p4BLruQ3wOGLvS08AbkH3drUplkRlHTLWlVM40jS/JC6EdxLP/PsteeFgmZw21yBCFnxf8mk/ tGWDz+l1 b9oPbx8KAh/00L5MTp6n2fygS5IBO6M6XuWK5oQAdd263r4zglbLzNk/RgsGnh8//lLNiPrFJq1mPeC6C+q16NzcpJ1L3QpS1diO9f+b+tGVryNC+DiHSfOKObB4OSBon4YcwNatDj0n6fptB4ieWS2h+gqwocJwo1CKH1ZA4pPIQss0o0EY+lQQwoKV506vu8ODh/n5i6dvj7p1NLzcOd4wvRhTY+rk5d5ZXWvyAlGVd9OHKWqFOWS/7KLC1mQlctY+GaXb45LPfxPDU3FRr0u+sLtTCwmvV2R26pFDjAPS94iXbO9Y/RWEYRRbCIZKBF4jtHyR8QSUpiucFRNkeOPn63e1reKdpFYxgGViInitHss6+mykfw01ZhMsUCbIypfaYHdUvR0GkDac= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 1/14/25 09:05, Dave Hansen wrote: > On 1/14/25 06:29, Tom Lendacky wrote: >>> Given the choice between "a bug in the calling code >>> crashes the kernel" and "a bug in the calling code >>> results in a missed TLB flush", I'm guessing the >>> crash is probably better. >> So instead of the negative number protection, shouldn't this just use an >> unsigned int for extra_count and panic() if the value is greater than >> invlpgb_count_max? The caller has some sort of logic problem and it >> could possibly result in missed TLB flushes. Or if a panic() is out of >> the question, maybe a WARN() and a full TLB flush to be safe? > > The current implementation will panic in the #GP handler though. It > should be pretty easy to figure out that INVLPGB is involved with RIP or > the Code: snippet. From there, you'd need to figure out what caused the #GP. Hmmm, maybe I'm missing something. IIUC, when a negative number is supplied, the extra_count field will be set to 0 (via the max() function) and allow the INVLPGB to continue. 0 is valid in ECX[15:0] and so the instruction won't #GP. Thanks, Tom > > I guess the one nasty thing is that a person debugging this might not > have a CPUID dump handy so wouldn't actually know the number of valid > addresses that INVLPGB can take. > > But otherwise, I'm not sure an explicit panic adds _much_ value here > over an implicit one via the #GP handler. I don't know how everybody > else feels about it, but I'm happy just depending on the #GP for now.