On 5/2/25 02:55, Valentin Schneider wrote: > My gripe with that was having two separate mechanisms > - super early entry around SWITCH_TO_KERNEL_CR3) > - later entry at context tracking
What do you mean by "later entry"? All of the paths to enter the kernel from userspace have some SWITCH_TO_KERNEL_CR3 variant. If they didn't, the userspace that they entered from could have attacked the kernel with Meltdown. I'm theorizing that if this is _just_ about avoiding TLB flush IPIs that you can get away with a single mechanism.
