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You are here: Home / News / Linux Menonaktifkan PCID Untuk Intel Alder Lake & Raptor Lake Karena Masalah Dengan INVLPG

Linux Menonaktifkan PCID Untuk Intel Alder Lake & Raptor Lake Karena Masalah Dengan INVLPG

May 22, 2023 by Søren

Sebuah tambalan tertunda melalui x86/mendesak untuk mengatasi masalah dengan prosesor Intel Alder Lake dan Raptor Lake yang membuat pengembang kernel untuk sementara waktu menonaktifkan Process Context Identifiers (PCID) dengan prosesor seluler/desktop Intel ini.

Sebuah tambalan diatur untuk mainline untuk pengembangan Linux 6.4 dan juga di-porting ke versi kernel yang stabil untuk menghindari flush INVLPG global yang tidak lengkap.

Prosesor yang terpengaruh adalah prosesor Intel Alder Lake dan Raptor Lake. Seperti disebutkan dalam pesan tambalan, Intel dikatakan bekerja pada mitigasi mikrokode untuk masalah ini tetapi untuk saat ini setidaknya kernel Linux diatur untuk menonaktifkan dukungan PCID untuk Alder Lake / Alder Lake L / Alder Lake N / Raptor Lake / Raptor Lake P / Raptor Lake S hingga mitigasi mikrokode dapat ditangani.

INVLPG digunakan untuk membatalkan entri TLB tertentu. Setidaknya Alder Lake dan Raptor Lake tidak membutuhkan Kernel Page Table Isolation (KPTI) untuk memitigasi Meltdown karena prosesor yang lebih baru ini tidak terpengaruh olehnya.

Tetapi untuk prosesor Intel yang lebih lama, dukungan PCID membantu mengimbangi beberapa biaya tambahan dalam menangani Isolasi Tabel Halaman Kernel / mengurangi Meltdown seperti yang ditunjukkan beberapa tahun yang lalu.

Selengkapnya: Phoronix

Tagged With: Hardware, Intel, Patch, Security, Vulnerability

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