> Quoting ARM and AMD is really a bit pathetic too, IMHO, especially if it turns out that AMD chips are immune to the flaw.
The official fix for this in the Linux kernel has a comment that literally says to assume all x86 processors suffer from the same issue and will disable KPTI for all x86 processors, including AMD.
There's an AMD-specific patch that I saw floating around that keeps the setting enabled for AMD processors, but I'm not sure if it made it into the mainline.
The original fix had a comment that literally said, "/* Assume for now that ALL x86 CPUs are insecure */" They've since added a check to exclude AMD processors.
I don't know if it's possible to see who contributed that patch (yet), but I’m cynical enough to half-expect that the “assume all x86 processors are insecure” patch might come from an Intel engineer...
I would not be surprised at all, considering the patch I saw for the AMD processors was literally a one-line if statement around the set cpu insecure flag that added a check for AMD processors.
The official fix for this in the Linux kernel has a comment that literally says to assume all x86 processors suffer from the same issue and will disable KPTI for all x86 processors, including AMD.
There's an AMD-specific patch that I saw floating around that keeps the setting enabled for AMD processors, but I'm not sure if it made it into the mainline.