"the meltdown patch in the kernel thats disabled by default"
I'm not sure to what you are referring to here.
I was one of the people who worked on the Linux PTI implementation that mitigated Meltdown. My memory is not perfect, but I honestly don't know what you're referring to.
The whole IBRS_ALL feature to me very clearly says "Intel is not serious about this, we'll have a ugly hack that will be so expensive that we don't want to enable it by default, because that would look bad in benchmarks".
Comments
I'm not sure to what you are referring to here.
I was one of the people who worked on the Linux PTI implementation that mitigated Meltdown. My memory is not perfect, but I honestly don't know what you're referring to.
I'm guessing they're referring to Linus' ranting on Intel here: https://lore.kernel.org/lkml/CA+55aFwOkH8RH12Dzs=hT3e7eS3Ckz...
Live by the SPEC, die by the SPEC