Kernel page-table isolation - Wikipedia

One set of page table for use in kernel mode includes both kernel-space and user-space. The second set of page table for use in user mode contains a copy of user-space and a minimal set of kernel-space handling system calls and interrupts. Kernel page-table isolation (KPTI or PTI,[1] previously called KAISER)[2][3] is a Linux kernel feature that mitigates the Meltdown security vulnerability (affec

[mkusunok]

Intel CPUのKASLRに対するサイドチャネル攻撃が可能になったんでKPTIが導入されましたよと。昨年末には騒ぎになってたのね。しかしWikipediaの更新はや

[rjj]

“a Linux developer measured it to be roughly 5% for most workloads and up to 30% in some cases, even with the PCID optimization;[”