> On May 12, 2020, at 10:45 AM, Dave Hansen <dave.hansen@xxxxxxxxx> wrote: > > On 5/4/20 7:49 AM, Alexandre Chartre wrote: >> This version 4 of the kernel Address Space Isolation (ASI) RFC. I have >> broken it down into three distinct parts: >> >> - Part I: ASI Infrastructure and PTI (this part) >> - Part II: Decorated Page-Table >> - Part III: ASI Test Driver and CLI >> >> Part I is similar to RFCv3 [3] with some small bug fixes. Parts II and III >> extend the initial patchset: part II introduces decorated page-table in >> order to provide convenient page-table management functions, and part III >> provides a driver and CLI for testing ASI (using parts I and II). > > These look interesting. I haven't found any holes in your methods, > although the interrupt depth tracking worries me a bit. I tried and > failed to do a similar thing with PTI in the NMI path, but you might > have just bested me there. :) > > It's very interesting that you've been able to implement PTI underneath > all of this, and the "test driver" is really entertaining! > > That said, this is working in some of the nastiest corners of the x86 > code and this is going to take quite an investment to get reviewed. I'm > not *quite* sure it's all worth it. > > So, this isn't being ignored, I'm just not quite sure what to do with > it, yet. I’m going to wait until the dust settles on tglx’s big entry rework before I look at this.
