Intel News Archives
LLVM Developers Are Still Debating How To Handle The Intel JCC Erratum Mitigation

Disclosed back in mid-November was the Intel JCC Erratum that required a CPU microcode update to mitigate and that in turn had broad performance hits. But via toolchain updates, some of that overhead can be offset. The GNU Assembler patches were quickly merged and new options exposed for helping to decrease that performance hit but on the LLVM side the developers are still working on their mitigation with some design decisions still to be made.

25 March 2020 - Jump Conditional Code - 6 Comments
Linux 5.7 To Bring Mitigation For Intel Gen7 Ivybridge/Haswell "iGPU Leak"

Back in January "iGPU Leak" was disclosed as CVE-2019-14615 as an information leakage vulnerability affecting Intel's graphics architecture leading to both register and local memory leaks. While Intel "Gen9" graphics were patched right away on the disclosure date and Gen8 Broadwell graphics were already mitigated, Gen7/Gen7.5 graphics took longer... In fact, not until the Linux 5.7 release this spring is there the mitigation for iGPU Leak.

14 March 2020 - Linux 5.7 - 5 Comments
Intel Tiger Lake Gen12/Xe Graphics Driver Support Considered Stable With Linux 5.7

Over the past year we have seen a steady flow of Intel Tiger Lake "Gen12" graphics enablement for the Linux kernel, their first generation also adopting the Xe Graphics branding as part of their discrete GPU initiative. With the Linux 5.7 kernel this spring will be the first release where the Gen12 graphics support is there by default as a sign of stability.

14 March 2020 - Tiger Lake Stable - Add A Comment
Intel Developer's Patch To Let SECCOMP Processes Like Web Browsers Opt Out Of Spectre V4

Currently the Linux kernel SECCOMP secure computing mode force-enables Spectre protections, which comes with obvious performance implications. When force-enabled, however, processes can't opt-out of the protection if they are not at risk to the likes of Spectre V4 "Speculative Store Bypass" issues. But a simple change being proposed would let such processes opt out if desired.

13 March 2020 - SECCOMP Handling - 11 Comments
Intel P-State Changes Could Improve iGPU-Bound Performance - Some Cases ~15%, ~43% Perf-Per-Watt

We've known that Intel's P-State Linux CPU frequency scaling driver in general can be a bit quirky and especially so when dealing with Intel integrated graphics where the iGPU and CPU share the same power envelope. This has been shown with examples like using the "powersave" governor to boost iGPU performance while discrete graphics owners are generally best off switching over to the "performance" governor. As the latest though on helping the iGPU front with P-State, there is a new patch series talking up big gains in performance and power efficiency.

10 March 2020 - P-State - 12 Comments
LVI Attack Hits Intel SGX - Defeats Existing Mitigations, More Performance Hits

Load Value Injection (LVI) is being disclosed today as a new class of transient-execution attacks and the researchers claim can defeat all existing mitigations around Meltdown, Foreshadow, Zombieload, RIDL and Fallout. The researchers say LVI can affect virtually any access to memory and compiler-based mitigations can be expensive.

10 March 2020 - Load Value Injection - 41 Comments
Intel Has Accumulated 400+ Graphics Driver Patches So Far For Linux 5.7

Intel just sent out their initial pull request of new feature changes/improvements to DRM-Next that in turn is for landing in about one month's time when the Linux 5.7 merge window kicks off. With taking longer than usual to send in their first round of feature updates, this first of several pull requests already amounts to over 400 patches.

25 February 2020 - Linux 5.7 DRM-Next - 2 Comments

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