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Intel Posts Linux Kernel Patches For Supporting APX - Advanced Performance Extensions
Intel initially detailed Advanced Performance Extensions (APX) back in mid-2023 as extensions to double the number of general purpose registers and add other performance features
However, the Linux kernel needs to make accommodations around Advanced Performance Extensions for the new register state managed by the XSAVE instruction set, adjusting the XSAVE buffer offset, and ensuring all kernel assumptions are safe/relevant in an APX world. A set of patches from Intel engineers today establish a "request for comments" baseline on Linux kernel support for Advanced Performance Extensions. With Intel confirming in the recent Xeon 6500P and 6700P announcement that Clearwater Forest is already operational and fully functional, plus the fact of seeing Intel engineers bringing up Granite Rapids and Clearwater Forest hardware testing in other patches, the fact they are still relying on a simulator/emulator for APX testing punts its debut out past that point.
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