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PCID support is unlikely to be backported, but perhaps a simpler scheme with only two PCIDs (user and kernel) could be applied...
by bonzini 9y ago
PCID support is unlikely to be backported, but perhaps a simpler scheme with only two PCIDs (user and kernel) could be applied...
- kentonv 9y ago> PCID support is unlikely to be backported I dunno, it sounds like it might be easiest to go ahead and backport PCID along with these patches. It touches a lot of the same code, so trying to split it out might just create more problems.
- jabl 9y agoYes, and the impact on syscall-intensive workloads is bad enough with PCID, without it it's even worse. I'd be moderately surprised if only KPTI is backported and not PCID.