Intel's ENQCMD For Linux Ready To Be Re-Enabled - No Longer "Broken Beyond Repair"

[phoronix]

Phoronix: Intel's ENQCMD For Linux Ready To Be Re-Enabled - No Longer "Broken Beyond Repair"

Last June the Linux kernel disabled support for Intel's ENQCMD instructions as the kernel support was found to be "broken beyond repair" for this feature that's part of the Data Streaming Accelerator with upcoming Xeon Scalable "Sapphire Rapids" processors. Fortunately, now in time for Sapphire Rapids ramping up, Intel engineers have fixed up the ENQCMD code and looks like the next Linux kernel cycle will re-enable the functionality...

https://www.phoronix.com/scan.php?page=news_item&px=Intel-ENQCMD-In-TIP

[stormcrow]

So Intel, er, repaired it?

[chuckula]

It was so broken beyond repair that we had to repair it.

[carewolf]

So Intel, er, repaired it?

Or rewrote the code.

[coder]

So, does it transparently accelerate anything in the kernel? Or is it like something userspace or drivers have to explicitly use (presumably via syscalls, for userspace code)?