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toshi.kani@hpe.com, david@kernel.org, mikhail.v.gavrilov@gmail.com Subject: Re: [PATCH 1/1] x86/mm: fix incomplete page-table invalidation with TCE To: Lance Yang , Pedro Falcato References: <20261005052302.43042-1-lance.yang@linux.dev> <60d5db86-8002-4d87-b8d3-c161d674122b@linux.dev> Content-Language: en-GB From: Andrew Cooper Autocrypt: addr=andrew.cooper3@citrix.com; keydata= xsFNBFLhNn8BEADVhE+Hb8i0GV6mihnnr/uiQQdPF8kUoFzCOPXkf7jQ5sLYeJa0cQi6Penp VtiFYznTairnVsN5J+ujSTIb+OlMSJUWV4opS7WVNnxHbFTPYZVQ3erv7NKc2iVizCRZ2Kxn srM1oPXWRic8BIAdYOKOloF2300SL/bIpeD+x7h3w9B/qez7nOin5NzkxgFoaUeIal12pXSR Q354FKFoy6Vh96gc4VRqte3jw8mPuJQpfws+Pb+swvSf/i1q1+1I4jsRQQh2m6OTADHIqg2E ofTYAEh7R5HfPx0EXoEDMdRjOeKn8+vvkAwhviWXTHlG3R1QkbE5M/oywnZ83udJmi+lxjJ5 YhQ5IzomvJ16H0Bq+TLyVLO/VRksp1VR9HxCzItLNCS8PdpYYz5TC204ViycobYU65WMpzWe LFAGn8jSS25XIpqv0Y9k87dLbctKKA14Ifw2kq5OIVu2FuX+3i446JOa2vpCI9GcjCzi3oHV e00bzYiHMIl0FICrNJU0Kjho8pdo0m2uxkn6SYEpogAy9pnatUlO+erL4LqFUO7GXSdBRbw5 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U2FsdGVkX19Qb71DhvHY+DcvUqRP6IX+RFZ5sY51vxZm6J9C4CUjNPIOkBVa4gPd5uqzO4wK2e8hHqXpzgWn629vo9je5sHmxSw66Kc/6O6eQ6sIJahs7JQQsWQ+dwtDkBC6zPcRFMcgpiZuVCIpjBrXVgUZ/igfQH7HUGqrxXaxUWkM0x6RXfFfhk1Djw6H3fZdeIGOaaKqhqcnYEagBqiPNmE1+99PAK2KKleMFqfISCwT3Sgqt0NEo+IkNPQVbO1S0/ZbyNx73+8Q8ilH/3klyy8Bc2skNID3ylsAjVOCW8ErvGRUc6zBcDa4f0ywRB+Sqo3XhAM2T9SBVNB/BAb7ulmmJrssk+lTvEPdEADU+8qoLrZypRDAimoRFLMczRDsFLOmgQfrtyzOSFHuXZiBQu7b95uPjnmQ7heU4QgoHC9kjIURDcD+Wo+zkX1MvDQ35iYEN6nVTkQSwTHGTJ031PJFa84yczMuuMjeF5Gb3JcwC3mUIRMwwBaqu2t8F570uHQ0kN6cEIcvrOmAfbivsiuV7/8mo+tZoeCBXsYWSmMtuqfo3tMDoX+okm78tO06IKREIj4h16plTrdxoOBn76AEtZFsxeWXom4vI8yGtGJo6BbSqNiqTnp0S9rSZXTkW2hqFCUWM1BOEevnXWcCFt7iBIav+Qlo8G4R6bny44mQGAdLDtlw4VfZuyVm4HHWXnOkX/yGnvkT6URay34p99Tox++DRkeaEqKrBnSsuvGWQ+nbBdUI+lG6mBKjuq0O7XGTWaeTg9BYf3/4cy30iNc7pZOw8me2OEsrFZERk65tLwPJgrh5J2PwGfBkd+0iovSKcZlgYBXphASVTx6+u0cbTPT3ERfRpNHxhc7S7fQBG+6T/VgXtGMMxhNvS6dKX3u3sP4zc48KIxzmOaXzDiTpFLSQDMC/F4OMxUeVqazqEdRgasavJOH0+sto0Smmbef9N7bv1KHvRHE e4G9XAau 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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. ~Andrew