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In the mid-1990s, a facility for supplying new microcode was initially referred to as the Pentium Pro BIOS Update Feature. [18] [19] It was intended that user-mode applications should make a BIOS interrupt call to supply a new "BIOS Update Data Block", which the BIOS would partially validate and save to nonvolatile BIOS memory; this could be supplied to the installed processors on next boot.
In October 2018, Intel disclosed a TSX/TSX-NI memory ordering issue found in some Skylake processors. [26] As a result of a microcode update, HLE support was disabled in the affected CPUs, and RTM was mitigated by sacrificing one performance counter when used outside of Intel SGX mode or System Management Mode . System software would have to ...
Intel reported that they are preparing new patches to mitigate these flaws. [24] On August 14, 2018, Intel disclosed three additional chip flaws referred to as L1 Terminal Fault (L1TF). They reported that previously released microcode updates, along with new, pre-release microcode updates can be used to mitigate these flaws. [25] [26]
Intel promised microcode updates to resolve the vulnerability. [1] The microcode patches have been shown to significantly reduce the performance of some heavily-vectorized loads. [7] Patches to mitigate the effects of the vulnerability have also been created as part of the forthcoming version 6.5 release of the Linux kernel. [8]
Intel processor microcode security update (fixes the issues when running 32-bit virtual machines in PAE mode) Notes on Intel Microcode Updates, March 2013, by Ben Hawkes, archived from the original on September 7, 2015; Hole seen in Intel's bug-busting feature, EE Times, 2002, by Alexander Wolfe, archived from the original on March 9, 2003
A microcode update fixing a bug with the eTVB algorithm was published the previous month, but this was confirmed by Intel to not be the root cause of the problem, although it may have been a contributing factor. [43] Intel confirmed that there is no fix to the issue if it already affects a CPU, and any damage to the CPU is permanent.
[29] [30] ExamSoft similarly stated that its monitoring software for educational assessments (such as the bar examination) was similarly incompatible with Alder Lake CPUs due to checks detecting virtual machines. [31] This problem has been fixed in a microcode update. The P and E cores now return the same CPUID when both are enabled.
Ivy Bridge is the final Intel platform on which versions of Windows prior to Windows 7 are officially supported by Microsoft. It is also the earliest Intel microarchitecture to officially support Windows 10 64-bit (NT 10.0). [7]
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