I haven't looked at the code details, but based on the description I have seen, the fix is only applied on hardware that is actually affected. So presumably not for older Intel, for AMD, for Z, for Power, etc.
Willemina On January 4, 2018 2:29:34 PM GMT+00:00, Bfishing <[email protected]> wrote: >One does have to question if the fix(es) will cause additional >overhead, no >matter what platform the system resides on. > >On Thu, Jan 4, 2018 at 9:14 AM, John McKown ><[email protected]> >wrote: > >> On Thu, Jan 4, 2018 at 7:36 AM, Guest, Darren < >> [email protected]> >> wrote: >> >> > Hi, >> > >> > Not sure if people have seen that attached article or heard of the >> 'intel' >> > chip issues from elsewhere: >> > https://www.theregister.co.uk/2018/01/02/intel_cpu_design_flaw/ >> > >> > The 'fix' for meltdown (at least) is apparently to change the Linux >> kernel >> > which will potentially affect performance. I'm pretty sure that >zSeries >> > isn't affected by the issue (is it?), but if the Linux Kernel is >changed, >> > are we likely to see a performance hit on Linux running on zSeries >as >> well >> > (even though we don't need the fix)? >> > >> > Best case scenario, can I tell my management that these won't >affect >> Linux >> > on z? >> > >> >> I am not any kind of Linux internals wizzard. But this exploit takes >> advantage of a _HARDWARD_ flaw in the Intel CPU. Linux on z does not >run on >> an _Intel_ chip. The story, that I've read at least, specifically >mentions >> that most AMD chips are not affected; nor are ARM chips. So why >would the >> z chip? Of course, management usually being composed of hardware >illiterate >> "liberal arts" majors, perhaps it would be a good idea for IBM to >> explicitly announce to the work that this flaw does not affect the >IBMZ >> machines. >> >> >> >> > >> > >> > Cheers, >> > >> > Darren >> > >> > Darren Guest >> > >> > First Aider >> > Senior Fire Executive >> > Senior Systems Engineer >> > Mainframe OS >> > Global Technology Services, Experian UK >> > >> >> -- >> I have a theory that it's impossible to prove anything, but I can't >prove >> it. >> >> Maranatha! <>< >> John McKown >> >> >---------------------------------------------------------------------- >> For LINUX-390 subscribe / signoff / archive access instructions, >> send email to [email protected] with the message: INFO LINUX-390 >or >> visit >> http://www.marist.edu/htbin/wlvindex?LINUX-390 >> >---------------------------------------------------------------------- >> For more information on Linux on System z, visit >> http://wiki.linuxvm.org/ >> > > > >-- > >><((((º>`·.¸¸´¯`·.¸.·´¯`·...¸>(((º> >.·´¯`·.><((((º>`·.¸¸.·´¯`·.¸.·´¯`·...¸><((((º> > ><>< Go fishing ><> > >---------------------------------------------------------------------- >For LINUX-390 subscribe / signoff / archive access instructions, >send email to [email protected] with the message: INFO LINUX-390 >or visit >http://www.marist.edu/htbin/wlvindex?LINUX-390 >---------------------------------------------------------------------- >For more information on Linux on System z, visit >http://wiki.linuxvm.org/ -- Sent from my Android device with K-9 Mail. Please excuse my brevity. ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
