On Sun, Nov 06, 2016 at 05:41:34PM -0200, Henrique de Moraes Holschuh wrote:
> On Sun, 06 Nov 2016, Ben Hutchings wrote:
> > It's worth noting that TSX is broken in 'Haswell' processors and is
> > supposed to be disabled via a microcode update. I don't know whether
> > glibc avoids using it on these processors if the microcode update is
> > not applied. (Linux doesn't appear to hide the feature flags.)
>
> It does avoid it. For glibc libpthreads, Debian has blacklisted Intel
> TSX use [in libpthreads] on all of Haswell and much of Broadwell.
>
> But anything else *will* attempt to use it, people query cpuid directly
> for these things. You need a hypervisor that filters cpuid().
All users who are using intel-microcode from non-free instead of running
outdated microcode with known errata should be OK here?
Running outdated microcode is a bad idea, and noone is making
Debian-specific workarounds for all the other CPU errata.
cu
Adrian
--
"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed
