Re: Intel CPUs' Kernel Page Table Isolation (KPTI) fix
Sarah Newman <[email protected]>
| Newsgroups | gmane.org.user-groups.linux.svlug |
|---|---|
| Message-ID | <[email protected]> |
On 01/04/2018 12:44 AM, Rick Moen wrote: > What's a 30% CPU performance hit between friends? > > ----- Forwarded message from Vincent Deffontaines <[email protected]> ----- > > Date: Wed, 03 Jan 2018 11:43:40 +0100 > From: Vincent Deffontaines <[email protected]> > To: [email protected] > Subject: Huge Intel CPU Bug Allegedly Causes Kernel Memory Vulnerability With > Up To 30% Performance Hit > > Greetings, > > And happy new year. > > This is hitting all of us soon. > In short: a huge (and long lasting) hardware bug, present in about > all Intel CPUs that have been sold for the last 10 years. > It is not fixable by microcode, and requires ugly patching from the > kernel layer . Other OSes such as Microsoft are concerned as well. There are actually 3 different classes of vulnerabilities. It's not just intel. https://developer.arm.com/support/security-update There will be microcode updates. I don't know if they will be needed for systems not running a VM. https://lists.xenproject.org/archives/html/xen-devel/2018-01/msg00110.html