IBM s390 Continues Working On Spectre Defense With Linux 4.17, VirtIO GPU Emulation

phoronix

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IBM s390 Continues Working On Spectre Defense With Linux 4.17, VirtIO GPU Emulation

03 April 2018, 08:10 AM

Phoronix: IBM s390 Continues Working On Spectre Defense With Linux 4.17, VirtIO GPU Emulation

With the Linux 4.17 kernel the s390 architecture updates include more mitigation work around the Spectre Variant One and Two vulnerabilities...

IBM s390 Continues Working On Spectre Defense With Linux 4.17, VirtIO GPU Emulation - Phoronix

http://www.phoronix.com/scan.php?page=news_item&px=IBM-s390-Linux-4.17-Features

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bridgman

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03 April 2018, 08:36 AM

It's easy to forget that mainframe CPUs have been using speculative execution for decades. Pretty sure the IBM 360/91 used it back in 1964 - not sure about the CDC 6600 though. The 6600 definitely used out-of-order execution but not sure if it could execute past an unresolved branch.

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